Supero C7B250-CB-MK User manual

C7B250-CB-MK
USER’S MANUAL
Revision 1.0

The information in this user’s manual has been carefully reviewed and is believed to be accurate. The
vendor assumes no responsibility for any inaccuracies that may be contained in this document, makes
no commitment to update or to keep current the information in this manual, or to notify any person
or organization of the updates. Please Note: For the most up-to-date version of this manual,
please see our web site at www.supermicro.com.
Super Micro Computer, Inc. ("Supermicro") reserves the right to make changes to the product de-
scribed in this manual at any time and without notice. This product, including software and documenta-
tion, is the property of Supermicro and/or its licensors, and is supplied only under a license. Any use or
reproduction of this product is not allowed, except as expressly permitted by the terms of said license.
IN NO EVENT WILL SUPERMICRO BE LIABLE FOR DIRECT, INDIRECT, SPECIAL, INCIDEN-
TAL, SPECULATIVE OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OR INABILITY
TO USE THIS PRODUCT OR DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES. IN PARTICULAR, SUPERMICRO SHALL NOT HAVE LIABILITY FOR ANY
HARDWARE, SOFTWARE, OR DATA STORED OR USED WITH THE PRODUCT, INCLUDING THE
COSTS OF REPAIRING, REPLACING, INTEGRATING, INSTALLING OR RECOVERING SUCH
HARDWARE, SOFTWARE, OR DATA.
Any disputes arising between manufacturer and customer shall be governed by the laws of Santa
Clara County in the State of California, USA. The State of California, County of Santa Clara shall be
the exclusive venue for the resolution of any such disputes. Super Micro's total liability for all claims
will not exceed the price paid for the hardware product.
FCC Statement: This equipment has been tested and found to comply with the limits for a class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with the instruc-
tions, may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interfer-
ence to radio or television reception, which can be determined by turning the equipment off and on,
the user is encouraged to try to correct the interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment to an outlet on a circuit different from that to which the
receiver is connected.
•Consult the authorized dealer or an experienced radio/TV technician for help.
California Best Management Practices Regulations for Perchlorate Materials: This Perchlorate warning
applies only to products containing CR (Manganese Dioxide) Lithium coin cells. “Perchlorate Material-
special handling may apply. See www.dtsc.ca.gov/hazardouswaste/perchlorate”
WARNING: Handling of lead solder materials used
in this product may expose you to lead, a chemi-
cal known to the State of California to cause birth
defects and other reproductive harm.
Manual Revision 1.0
Release Date: May 23, 2017
Unless you request and receive written permission from Super Micro Computer, Inc., you may not
copy any part of this document.
Information in this document is subject to change without notice. Other products and companies
referred to herein are trademarks or registered trademarks of their respective companies or mark
holders.
Copyright © 2017 by Super Micro Computer, Inc. All rights reserved.
Printed in the United States of America

iii
Preface
This manual is written for system integrators, PC technicians and
knowledgeable PC users. It provides information for the installation and
use of the C7B250-CB-MK motherboard.
Manual Organization
Chapter 1 describes the features, specications and performance of
the motherboard, and provides detailed information on the Intel B250
Express chipset.
Chapter 2 provides hardware installation instructions. Read this chap-
ter when installing the processor, memory modules and other hardware
components into the system.
If you encounter any problems, see Chapter 3, which describes trouble-
shooting procedures for video, memory and system setup stored in the
CMOS.
Chapter 4 includes an introduction to the BIOS, and provides detailed
information on running the CMOS Setup utility.
Appendix A provides BIOS Error Beep Codes.
Appendix B lists software program installation instructions.
Appendix C contains UEFI BIOS Recovery instructions.
Appendix D contains an introduction and instructions regarding the Dual
Boot Block feature of this motherboard.
Preface

iv
Conventions Used in the Manual
Special attention should be given to the following symbols for proper
installation and to prevent damage done to the components or injury
to yourself:
Attention! Critical information to prevent damage to the com-
ponents or injury to yourself.
Important: Important information given to ensure proper sys-
tem installation or to relay safety precautions.
Note: Additional Information given to differentiate various mod-
els or provides information for correct system setup.
Supermicro C7B250-CB-MK Motherboard User’s Manual
Checklist
Congratulations on purchasing your computer motherboard from an ac-
knowledged leader in the industry. Supermicro boards are designed with
the utmost attention to detail to provide you with the highest standards
in quality and performance.
Please check that the following items have all been included with your
motherboard. If anything listed here is damaged or missing, contact
your retailer.
The following items are included in the retail box.
• One (1) Supermicro Motherboard
• SATA cables
• One (1) I/O shield
• One (1) Quick Reference Guide
• One (1) Driver CD

v
Standardized Warning Statements
Standardized Warning Statements
The following statements are industry-standard warnings, provided to
warn the user of situations which have the potential for bodily injury.
Should you have questions or experience difculty, contact Supermicro's
Technical Support department for assistance. Only certied technicians
should attempt to install or congure components.
Read this section in its entirety before installing or conguring compo-
nents in the Supermicro chassis.
Battery Handling
Warnung
Bei Einsetzen einer falschen Batterie besteht Explosionsgefahr. Ersetzen
Sie die Batterie nur durch den gleichen oder vom Hersteller empfohlenen
Batterietyp. Entsorgen Sie die benutzten Batterien nach den Anweisungen
des Herstellers.
Warning!
There is a danger of explosion if the battery is replaced incorrectly. Re-
place the battery only with the same or equivalent type recommended
by the manufacturer. Dispose of used batteries according to the manu-
facturer's instructions
電池の取り扱い
電池交換が正しく行われなかった場合、破裂の危険性があります。 交換する電池はメー
カーが推奨する型、または同等のものを使用下さい。 使用済電池は製造元の指示に従
って処分して下さい。
警告
电池更换不当会有爆炸危险。请只使用同类电池或制造商推荐的功能相当的电池更
换原有电池。请按制造商的说明处理废旧电池。
警告
電池更換不當會有爆炸危險。請使用製造商建議之相同或功能相當的電池更換原有
電池。請按照製造商的說明指示處理廢棄舊電池。
Attention
Danger d'explosion si la pile n'est pas remplacée correctement. Ne la
remplacer que par une pile de type semblable ou équivalent, recom-
mandée par le fabricant. Jeter les piles usagées conformément aux
instructions du fabricant.

vi
¡Advertencia!
Existe peligro de explosión si la batería se reemplaza de manera incor-
recta. Reemplazar la batería exclusivamente con el mismo tipo o el
equivalente recomendado por el fabricante. Desechar las baterías gasta-
das según las instrucciones del fabricante.
Supermicro C7B250-CB-MK Motherboard User’s Manual
!הרהזא
תנכס תמייקץוציפ .הניקת אל ךרדב הפלחוהו הדימב הללוסה לש ףילחהל שי
גוסב הללוסה תא מ םאותה תרבחלמומ ןרציתצ.
תוללוסה קוליס תושמושמה עצבל שי .ןרציה תוארוה יפל




경고!
배터리가 올바르게 교체되지 않으면 폭발의 위험이 있습니다. 기존 배터리와 동일
하거나 제조사에서 권장하는 동등한 종류의 배터리로만 교체해야 합니다. 제조사
의 안내에 따라 사용된 배터리를 처리하여 주십시오.
Waarschuwing
Er is ontplofngsgevaar indien de batterij verkeerd vervangen wordt. Ver-
vang de batterij slechts met hetzelfde of een equivalent type die door de
fabrikant aanbevolen wordt. Gebruikte batterijen dienen overeenkomstig
fabrieksvoorschriften afgevoerd te worden.
Product Disposal
Warning!
Ultimate disposal of this product should be handled according to all na-
tional laws and regulations.

vii
Standardized Warning Statements
製品の廃棄
この製品を廃棄処分する場合、国の関係する全ての法律・条例に従い処理する必要が
ありま す。
警告
本产品的废弃处理应根据所有国家的法律和规章进行。
警告
本產品的廢棄處理應根據所有國家的法律和規章進行。
Warnung
Die Entsorgung dieses Produkts sollte gemäß allen Bestimmungen und
Gesetzen des Landes erfolgen.
¡Advertencia!
Al deshacerse por completo de este producto debe seguir todas las leyes
y reglamentos nacionales.
Attention
La mise au rebut ou le recyclage de ce produit sont généralement soumis
à des lois et/ou directives de respect de l'environnement. Renseignez-
vous auprès de l'organisme compétent.
רצומה קוליס
!הרהזא
ו תויחנהל םאתהב תויהל בייח הז רצומ לש יפוס קוליס.הנידמה יקוח
Waarschuwing
De uiteindelijke verwijdering van dit product dient te geschieden in over-
eenstemming met alle nationale wetten en reglementen.
 
경고!
이 제품은 해당 국가의 관련 법규 및 규정에 따라 폐기되어야 합니다.

viii
Supermicro C7B250-CB-MK Motherboard User’s Manual
Contacting Supermicro
Headquarters
Address: Super Micro Computer, Inc.
980 Rock Ave.
San Jose, CA 95131 U.S.A.
Tel: [phone]
Fax: [phone]
Email: [e-mail] (General Information)
[email protected] (Technical Support)
Web Site: www.supermicro.com
Europe
Address: Super Micro Computer B.V.
Het Sterrenbeeld 28, 5215 ML
's-Hertogenbosch, The Netherlands
Tel: [phone]
Fax: [phone]
Email: [email protected] (General Information)
[email protected] (Technical Support)
[email protected] (Customer Support)
Web Site: www.supermicro.nl
Asia-Pacic
Address: Super Micro Computer, Inc.
3F, No. 150, Jian 1st Rd.
Zhonghe Dist., New Taipei City 235
Taiwan (R.O.C)
Tel: [phone]
Fax: [phone]
Email: [email protected]
Web Site: www.supermicro.com.tw

ix
Contacting Supermicro
Where to Find More Information
For your system to work properly, please follow the links below to
download all necessary drivers/utilities and the user's manual for your
motherboard.
SMCI product manuals: http://www.supermicro.com/support/manuals/
Product Drivers and utilities: ftp://ftp.supermicro.com/
If you have any questions, please contact our support team at support@
supermicro.com.

x
Table of Contents
Preface
Manual Organization ..........................................................................iii
Checklist ..........................................................................................iv
Conventions Used in the Manual .........................................................iv
Standardized Warning Statements ....................................................... v
Battery Handling....................................................................... v
Product Disposal.......................................................................vi
Contacting Supermicro..................................................................... viii
Where to Find More Information..........................................................ix
Chapter 1 Introduction
1-1 Overview .............................................................................. 1-1
About this Motherboard .......................................................... 1-1
1-2 Chipset Overview .................................................................. 1-1
Intel B250 Express Chipset Features ........................................ 1-1
1-3 Motherboard Features ............................................................... 1-2
1-4 Special Features .................................................................... 1-4
Recovery from AC Power Loss ................................................. 1-4
1-5 PC Health Monitoring.............................................................. 1-4
Fan Status Monitor and Control .............................................. 1-4
Environmental Temperature Control ......................................... 1-4
System Resource Alert ........................................................... 1-5
1-6 ACPI Features ....................................................................... 1-5
Slow Blinking LED for Suspend-State Indicator.......................... 1-5
1-7 Power Supply ........................................................................ 1-6
1-8 Super I/O ............................................................................. 1-6
Chapter 2 Installation
2-1 Installation Components and Tools Needed ............................... 2-1
2-2 Static-Sensitive Devices.......................................................... 2-2
Precautions ........................................................................... 2-2
Unpacking............................................................................. 2-2
2-3 Processor and Heatsink Installation.......................................... 2-3
Installing the LGA1151 Processor ........................................... 2-3
Installing an Active CPU Heatsink with Fan ............................... 2-6
Removing the Heatsink........................................................... 2-8
2-4 Installing DDR4 Memory ......................................................... 2-9
DIMM Installation .................................................................. 2-9
Supermicro C7B250-CB-MK Motherboard User’s Manual

xi
Table of Contents
Removing Memory Modules..................................................... 2-9
Memory Support.................................................................. 2-10
Memory Population Guidelines ............................................... 2-11
2-5 Motherboard Installation ....................................................... 2-12
Tools Needed....................................................................... 2-12
Location of Mounting Holes ................................................... 2-12
Installing the Motherboard .................................................... 2-13
2-6 Connector and I/O Ports ....................................................... 2-14
I/O Back Panel .................................................................... 2-14
Universal Serial Bus (USB) ................................................ 2-15
Ethernet Port................................................................... 2-16
Back Panel High Denition Audio (HD Audio) ...................... 2-16
ATX PS/2 Keyboard/Mouse Ports ........................................ 2-17
VESA® DisplayPort™ ........................................................ 2-17
HDMI Port ....................................................................... 2-17
DVI Port ......................................................................... 2-17
Front Control Panel .............................................................. 2-18
Front Control Panel Pin Denitions ......................................... 2-19
Power LED ..................................................................... 2-19
HDD LED ........................................................................ 2-19
NIC1 (LAN) ..................................................................... 2-19
Overheat (OH)/Fan Fail ..................................................... 2-19
Reset Button .................................................................. 2-20
Power Button .................................................................. 2-20
2-7 Connecting Cables ............................................................... 2-21
ATX Main PWR & CPU PWR Connectors ............................... 2-21
Fan Headers .................................................................... 2-22
Chassis Intrusion ............................................................. 2-22
Serial Port....................................................................... 2-23
Speaker .......................................................................... 2-23
DOM PWR Connector ........................................................ 2-24
SPDIF OUT ...................................................................... 2-24
Standby Power Header ..................................................... 2-25
PCI-E M.2 Connector ........................................................ 2-25
Front Panel Audio Header (AUDIO FP) ................................ 2-26
TPM Header/Port 80 ......................................................... 2-26
2-8 Jumper Settings .................................................................. 2-27
Explanation of Jumpers ........................................................ 2-27
Manufacturing Mode ......................................................... 2-27

xii
JCMOS & JBT1 ................................................................. 2-28
PCI-E Slot SMB Enable (I2C1/I2C2).................................... 2-28
Watch Dog Timer Enable/Disable ....................................... 2-29
BIOS Recovery Jumper ..................................................... 2-29
USB Wake Up .................................................................. 2-30
2-9 Onboard Indicators................................................................ 2-31
LAN LEDs ........................................................................ 2-31
Onboard Power LED ........................................................ 2-31
2-10 Hard Drive Connections........................................................ 2-32
SATA Connections (I-SATA0~I-SATA5) ................................ 2-32
Chapter 3 Troubleshooting
3-1 Troubleshooting Procedures..................................................... 3-1
Before Power On.................................................................... 3-1
No Power.............................................................................. 3-1
No Video .............................................................................. 3-2
Memory Errors ..................................................................... 3-2
When the System is Losing the Setup Conguration .................. 3-2
3-2 Technical Support Procedures .................................................. 3-3
3-3 Frequently Asked Questions .................................................... 3-4
3-4 Battery Removal and Installation ............................................. 3-5
Battery Removal .................................................................... 3-5
Proper Battery Disposal .......................................................... 3-5
3-5 Returning Motherboard for Service........................................... 3-6
Battery Installation ................................................................ 3-6
Chapter 4 BIOS
4-1 Introduction .......................................................................... 4-1
Starting BIOS GUI Setup Utility............................................... 4-1
How To Change the Conguration Data .................................... 4-2
How to Start the Setup Utility ................................................. 4-2
4-2 System Information ............................................................... 4-3
System Date ..................................................................... 4-3
System Time ..................................................................... 4-3
4-3 CPU ..................................................................................... 4-4
CPU Conguration.................................................................. 4-5
SW Guard Extension (SGX) ................................................. 4-6
CPU Flex Ratio Override...................................................... 4-6
CPU Flex Ratio Settings ...................................................... 4-6
Hardware Prefetcher .......................................................... 4-6
Supermicro C7B250-CB-MK Motherboard User’s Manual

xiii
Table of Contents
Adjacent Cache Line Prefetch ............................................. 4-6
Intel® (VMX) Virtualization Technology ................................ 4-6
Active Processor Cores........................................................ 4-6
Hyper-Threading ................................................................ 4-7
BIST................................................................................. 4-7
AES.................................................................................. 4-7
Machine Check................................................................... 4-7
MonitorMWait..................................................................... 4-7
Intel® Trusted Executed Technology..................................... 4-7
Alias Check Request ........................................................... 4-7
Reset AUX Content............................................................. 4-7
FCLK Frequency for Early Power On ..................................... 4-8
Power and Performance .......................................................... 4-8
CPU - Power Management Control ........................................... 4-8
Boot performance Mode ...................................................... 4-8
Intel(R) SpeedStep(tm) ...................................................... 4-8
Turbo Mode ....................................................................... 4-9
Platform PL1 Enable ........................................................... 4-9
Platform PL2 Enable ........................................................... 4-9
Power Limit 4 Override ....................................................... 4-9
C states ............................................................................ 4-9
Enhanced C-states ............................................................. 4-9
C-State Auto Demotion ....................................................... 4-9
C-State Un-demotion.......................................................... 4-9
Package C-State Demotion ................................................ 4-10
Package C-State Un-Demotion ........................................... 4-10
IO MWAIT Redirection....................................................... 4-10
Package C State Limit....................................................... 4-10
Package C State Workaround............................................. 4-10
GT-Power Management ......................................................... 4-10
4-4 Memory .............................................................................. 4-11
Memory Scrambler ........................................................... 4-12
Force ColdReset ............................................................... 4-12
Channel A DIMM Control ................................................... 4-12
Channel B DIMM Control ................................................... 4-12
Force Single Rank ............................................................ 4-12
MRC Fast Boot ................................................................. 4-12
4-5 Advanced............................................................................ 4-13
Boot Feature ....................................................................... 4-13

xiv
Supermicro C7B250-CB-MK Motherboard User’s Manual
Fast Boot ........................................................................ 4-13
Quiet Boot ...................................................................... 4-13
Bootup Num-Lock ............................................................ 4-13
Wait for "F1" If Error ........................................................ 4-13
Re-try Boot ..................................................................... 4-13
Watch Dog Function ......................................................... 4-14
Power Button Function...................................................... 4-14
AC Loss Policy Depend On................................................. 4-14
EuP Support .................................................................... 4-14
NCT6792D Super IO Conguration ......................................... 4-14
SuperIO Chip NCT6792D................................................... 4-15
Serial Port 1 Conguration ................................................ 4-15
Serial Port....................................................................... 4-15
Device Settings................................................................ 4-15
Change Settings .............................................................. 4-15
Serial Port Console Redirection .............................................. 4-15
COM 1 ............................................................................ 4-15
Console Redirection .......................................................... 4-15
System Agent (SA) Conguration........................................... 4-19
GMM Device (B0:D8:F0) ................................................... 4-21
X2APIC Opt Out............................................................... 4-21
Graphics Conguration ......................................................... 4-21
Graphics Turbo IMON Current ............................................ 4-22
Skip Scanning of External Gfx Card.................................... 4-22
Primary Display ............................................................... 4-22
Select PCIE Card.............................................................. 4-22
External Gfx Card Primary Display Conguration.................. 4-22
Internal Graphics ............................................................ 4-22
GTT Size ......................................................................... 4-22
Aperture Size .................................................................. 4-22
DVMT Pre-Allocated .......................................................... 4-23
DVMT Total Gfx Mem ........................................................ 4-23
Gfx Low Power Mode ........................................................ 4-23
VDD Enable..................................................................... 4-23
HDCP Support ................................................................. 4-23
Algorithm........................................................................ 4-23
PM Support ..................................................................... 4-23
PAVP Enable .................................................................... 4-23

xv
Table of Contents
Cdynmax Clamping Enable ................................................ 4-23
Graphics Clock Frequency ................................................. 4-23
PCH-IO Conguration ........................................................... 4-24
SATA and RST Conguration.................................................. 4-25
SATA Controllers .............................................................. 4-25
SATA Mode Selection ........................................................ 4-25
SATA Controller Speed ...................................................... 4-25
SATA Frozen .................................................................... 4-25
Serial ATA Port................................................................. 4-26
Hot Plug ......................................................................... 4-26
Congured as eSATA ........................................................ 4-26
Spin Up Device ................................................................ 4-26
SATA Device Type ............................................................ 4-26
PCH FW Conguration .......................................................... 4-26
ME FW Image Re-Flash..................................................... 4-27
USB Conguration................................................................ 4-28
Legacy USB Support......................................................... 4-28
XHCI Hand-Off................................................................. 4-28
PCIe/PCI/PnP Conguration................................................... 4-30
Security.............................................................................. 4-32
Administrator Password..................................................... 4-32
User Password ................................................................. 4-32
Secure Boot ........................................................................ 4-33
Attempt Secure Boot ........................................................ 4-33
Secure Boot Mode ............................................................ 4-33
CSM Support ................................................................... 4-33
Key Management ................................................................ 4-34
Provision Factory Default Keys........................................... 4-34
Install Factory Default Keys............................................... 4-34
Enroll E Image ............................................................... 4-34
Save All Secure Boot Variables .......................................... 4-34
Platform Key (PK) ............................................................ 4-34
Delete Key Exchange Key.................................................. 4-35
Key Exchange Keys .......................................................... 4-35
Append Key Exchange Key ................................................ 4-35
Delete Authorized Signature .............................................. 4-35
Authorized Signatures....................................................... 4-35
Append Authorized Signature............................................. 4-35
Delete Forbidden Signature ............................................... 4-36

xvi
Supermicro C7B250-CB-MK Motherboard User’s Manual
Forbidden Signatures........................................................ 4-36
Append Forbidden Signature.............................................. 4-36
Delete Authorized TimeStamps .......................................... 4-36
Authorized TimeStamps .................................................... 4-36
Append Authorized TimeStamp .......................................... 4-36
Delete OSRecovery Signatures........................................... 4-37
OsRecovery Signatures ..................................................... 4-37
Append OsRecovery Signature ........................................... 4-37
4-6 Thermal & Fan..................................................................... 4-38
Fan Control ......................................................................... 4-39
Fan Speed Control Mode ................................................... 4-39
4-7 Save & Exit......................................................................... 4-40
Boot mode select ............................................................. 4-40
FIXED BOOT ORDER Priorities............................................ 4-40
Legacy Boot Option #1~#8............................................... 4-40
USB Key Drive BBS Priorities ............................................. 4-40
NETWORK Drive BBS Priorities........................................... 4-40
Boot Override .................................................................. 4-40
SMI USB DISK 1100......................................................... 4-41
Launch EFI Shell from lesystem device ............................. 4-41
4-8 BIOS Update ....................................................................... 4-42
Start Update ................................................................... 4-42
Appendix A BIOS Error Beep Codes
A-1 BIOS Error Beep Codes .......................................................... A-1
Appendix B Software Installation Instructions
B-1 Installing Drivers ................................................................... B-1
B-2 Conguring SuperDoctor®5 ................................................... B-2
Appendix C UEFI BIOS Recovery Instructions
C-1 An Overview to the UEFI BIOS ................................................ C-1
C-2 How to Recover the UEFI BIOS Image (-the Main BIOS Block) .... C-1
C-3 To Recover the Main BIOS Block Using a USB-Attached Device.... C-2
Appendix D Dual Boot Block
D-1 Introduction ..........................................................................D-1
BIOS Boot Block ....................................................................D-1
BIOS Boot Block Corruption Occurrence ..................................D-1
D-2 Steps to Reboot the System by switch JBR1 .............................D-2

Chapter 1: Introduction
1-1
Chapter 1
Introduction
1-1 Overview
About this Motherboard
The C7B250-CB-MK motherboard supports a single 6th and 7th Genera-
tion Intel® CoreTM i7/i5/i3, Pentium®/Celeron® processor in an LGA
1151 (H4) socket. With the Intel B250 Express chipset built in, the
C7B250-CB-MK motherboard offers substantial system performance
and storage capability for overclocking platforms in a small form factor.
Please refer to our website (http://www.supermicro.com/products/) for
processor and memory support updates.
1-2 Chipset Overview
Intel B250 Express Chipset Features
• Direct Media Interface (up 10 Gb/s transfer, Full Duplex)
• Intel® Matrix Storage Technology and Intel Rapid Storage Technology
• Intel Optane technology support
• Intel I/O Virtualization (VT-d) Support
• Intel Trusted Execution Technology Support
• PCI Express 3.0 Interface (up to 8 GT/s)
• SATA Controller (up to 6Gb/sec)
• Advanced Host Controller Interface (AHCI)

1-2
Supermicro C7B250-CB-MK Motherboard User’s Manual
1-3 Motherboard Features
CPU Single 6th and 7th Generation Intel® CoreTM i7/i5/
i3, Pentium®/Celeron® processor in an LGA1151 type
socket, up to 65W TDP.
Memory Two (2) slots support up to 32GB of unbuffered, non-
ECC, 2400MHz DDR4 memory
Dual-channel memory
DIMM sizes
UDIMM 4GB, 8GB, 16GB
Chipset Intel® B250 Express
Expansion Slots One (1) PCH PCI-E 3.0 X1 slot
One (1) PCH PCI-E 3.0 X4 slot
One (1) CPU PCI-E 3.0 X16 slot
One (1) NVMe PCI-E X4 M.2
Network
Connections
One (1) Gigabit Ethernet Controller
One (1) RJ-45 rear I/O panel connector with Link and
Activity LEDs
I/O Devices Hard Drive Connections
SATA 3.0 (6Gb/s) Six (6) I-SATA 0~5
USB Devices
Four (4) USB 3.0 and two (2) USB 2.0 ports on the
rear I/O panel
Two (2) front accessible USB 2.0 ports on one header
Two (2) front accessible USB 3.0 ports on one header.
Keyboard/Mouse
One shared PS/2 Keyboard/Mouse port on the I/O back
panel
Other I/O Ports
One (1) VESA DisplayPort, One (1) DVI-D Port
One (1) HDMI 1.4 Port
One (1) Serial Port header (COM1)
Audio
One set of High Denition Audio 7.1 channel connec-
tors supported by Realtek ALC888S on the back panel
One (1) Front Panel Audio Header
One (1) S/PDIF Out on the rear side of the chassis

Chapter 1: Introduction
1-3
Super I/O
Nuvoton NCT6792D-B
BIOS 128 Mb AMI BIOS®SPI Flash BIOS
Plug and Play (PnP), DMI 2.8, PCI 2.3, ACPI
1.0/2.0/3.0, and USB Keyboard
Power
Configuration
ACPI/ASPM Power Management
Main Switch Override Mechanism
Internal/External Modem Ring-On
Power-on mode for AC power recovery
Health
Monitoring
CPU Monitoring
Onboard monitors: CPU core, +3.3V, +5V, +/- 12V,
+3.3V Stby, VBAT, HT, Memory PCH Temperature,
System Temperature, and CPU Temperature
CPU 3+2 phase switching voltage regulator
CPU/System overheat LED and control
CPU Thermal Trip support
Thermal Monitor support
Fan Control
Fan status monitoring with 4-pin fan speed control
Low noise fan speed control
System
Management
PECI (Platform Environment Conguration Interface)
2.0 support
System resource alert via SuperDoctor®5
SuperDoctor®5
Chassis Intrusion header and detection
CD Utilities BIOS ash upgrade utility
Drivers and software for Intel® B250 Express chipset
utilities
Other ROHS 6/6 (Full Compliance, Lead Free)
Dimensions Micro ATX form factor (9.6" x 9.6") (243.84 mm x
243.84 mm)

1-4
Supermicro C7B250-CB-MK Motherboard User’s Manual
1-4 Special Features
Recovery from AC Power Loss
Basic I/O System (BIOS) provides a setting for you to determine how
the system will respond when AC power is lost and then restored to
the system. You can choose for the system to remain powered off, (in
which case you must press the power switch to turn it back on), or for
it to automatically return to a power-on state. See the Advanced BIOS
Setup section to change this setting. The default setting is Last State.
1-5 PC Health Monitoring
This section describes the PC health monitoring features of the board.
All have an onboard System Hardware Monitoring chip that supports PC
health monitoring. An onboard voltage monitor will scan these onboard
voltages continuously: CPU core, +3.3V, +5V, +/- 12V, +3.3V Stby, +5V
Stby, VBAT, HT, Memory PCH Temperature, System Temperature, and CPU
Temperature. Once a voltage becomes unstable, a warning is given, or
an error message is sent to the screen. The user can adjust the voltage
thresholds to dene the sensitivity of the voltage monitor.
Fan Status Monitor and Control
PC health monitoring in the BIOS can check the RPM status of the cool-
ing fans. The onboard CPU and chassis fans are controlled by Thermal
Management via SIO.
Environmental Temperature Control
The thermal control sensor monitors the CPU temperature in real time
and will turn on the thermal control fan whenever the CPU temperature
exceeds a user-dened threshold. The overheat circuitry runs indepen-
dently from the CPU. Once the thermal sensor detects that the CPU
temperature is too high, it will automatically turn on the thermal fans to
prevent the CPU from overheating. The onboard chassis thermal circuitry
can monitor the overall system temperature and alert the user when the
chassis temperature is too high.
Note: To avoid possible system overheating, please be sure to
provide adequate airow to your system.