Supero SUPER P4DME-M User manual

®
SUPER P4DMS-6GM
SUPER P4DME-M
USER’S MANUAL
Revision 1.0b
SUPER

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.
SUPERMICRO COMPUTER reserves the right to make changes to the product described in
this manual at any time and without notice. This product, including software, if any, and
documentation may not, in whole or in part, be copied, photocopied, reproduced, translated
or reduced to any medium or machine without prior written consent.
IN NO EVENT WILL SUPERMICRO COMPUTER BE LIABLE FOR DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, 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, THE VENDOR 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.
Supermicro's total liability for all claims will not exceed the price paid for the hardware
product.
Unless you request and receive written permission from SUPER MICRO COMPUTER, 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 © 2002 by SUPER MICRO COMPUTER INC.
All rights reserved.
Printed in the United States of America

iii
Preface
Preface
About This Manual
This manual is written for system integrators, PC technicians and
knowledgeable PC users. It provides information for the installation and use
of the SUPER P4DMS-6GM/P4DME-M mainboard. The SUPER P4DMS-6GM/
P4DME-M supports single or dual Intel®603-pin XeonTM 512K L2 cache
processors at up to 2.8 GHz at a 400 MHz front side bus. Please refer to
the support section of our web site (http://www.supermicro.com/
TechSupport.htm) for a complete listing of supported processors. This
product is intended to be professionally installed.
Manual Organization
Chapter 1 begins with a checklist of what should be included in your
mainboard box, describes the features, specifications and performance of
the motherboard and provides detailed information about the chipset.
Chapter 2 begins with instructions on handling static-sensitive devices.
Read this chapter when you want to install the processor and memory
modules and when mounting the mainboard in the chassis. Also refer to
this chapter to connect the floppy and hard disk drives, SCSI drives, the IDE
interfaces, the parallel and serial ports, the keyboard and mouse, the power
supply and various other connections, buttons and indicators.
If you encounter any problems, see Chapter 3, which describes trouble-
shooting procedures for the video, the memory and the setup configuration
stored in CMOS. For quick reference, a general FAQ [Frequently Asked
Questions] section is provided. Instructions are also included for contact-
ing technical support. In addition, you can visit our web site (at
www.supermicro.com/techsupport.htm) for more detailed information.
Chapter 4 includes an introduction to PhoenixBIOS and provides detailed
information on running the CMOS Setup utility.
Appendix A gives information on PhoenixBIOS POST messages.
Appendix B provides PhoenixBIOS POST codes.

iv
SUPER P4DMS-6GM/P4DME-M User’s Manual
Preface
About This Manual ...................................................................................................... iii
Manual Organization ................................................................................................... iii
Chapter 1: Introduction
1-1 Overview......................................................................................................... 1-1
Checklist .................................................................................................... 1-1
Contacting Supermicro............................................................................ 1-2
Super P4DMS-6GM Image....................................................................... 1-4
Super P4DME-M Image ............................................................................ 1-5
Super P4DMS-6GM Layout..................................................................... 1-6
Super P4DMS-6GM Quick Reference................................................... 1-7
Super P4DME-M Layout .......................................................................... 1-8
Super P4DME-M Quick Reference ........................................................ 1-9
Motherboard Features ........................................................................... 1-10
Intel E7500 Chipset: System Block Diagram...................................... 1-12
1-2 Chipset Overview......................................................................................... 1-13
1-3 Special Features........................................................................................... 1-13
ATI Graphics Controller ........................................................................ 1-13
BIOS Recovery....................................................................................... 1-13
Recovery from AC Power Loss ......................................................... 1-14
1-4 PC Health Monitoring.................................................................................... 1-14
1-5 ACPI Features ............................................................................................... 1-15
1-6 Power Supply ............................................................................................... 1-17
1-7 Super I/O......................................................................................................... 1-18
Chapter 2: Installation
2-1 Static-Sensitive Devices ............................................................................... 2-1
Precautions............................................................................................... 2-1
Unpacking.................................................................................................. 2-1
2-2 PGA Processor and Heatsink Installation .................................................. 2-2
2-3 Installing DIMMs............................................................................................... 2-5
2-4 I/O Ports/Control Panel Connectors............................................................. 2-6
2-5 Connecting Cables .......................................................................................... 2-8
ATX Power Connection .......................................................................... 2-8
PWR_SEC Connection ............................................................................. 2-8
Power LED................................................................................................. 2-8
NMI Button .................................................................................................. 2-8
Table of Contents

Table of Contents
v
HDD LED .................................................................................................... 2-9
NIC1 LED ................................................................................................... 2-9
NIC2 LED ................................................................................................... 2-9
Overheat LED ........................................................................................... 2-9
Power Fail Button ..................................................................................... 2-9
Reset Button........................................................................................... 2-10
Power Button ......................................................................................... 2-10
Chassis Intrusion ................................................................................... 2-10
Universal Serial Bus (USB0/1) ............................................................ 2-10
Extra Universal Serial Bus Headers................................................... 2-11
Serial Ports ............................................................................................. 2-11
LAN (Ethernet) Ports.............................................................................. 2-11
ATX PS/2 Keyboard and Mouse Ports................................................ 2-11
Fan Headers........................................................................................... 2-12
Power LED/Speaker (JD1) ................................................................... 2-12
Third Power Supply Fail Header .......................................................... 2-12
Keylock ..................................................................................................... 2-13
Wake-On-LAN ......................................................................................... 2-13
Wake-On-Ring ......................................................................................... 2-13
2-6 Jumper Settings ............................................................................................ 2-14
Explanation of Jumpers ........................................................................ 2-14
CMOS Clear............................................................................................. 2-14
Mb LAN Enable/Disable......................................................................... 2-15
Gb LAN Enable/Disable......................................................................... 2-15
VGA Enable/Disable ............................................................................... 2-15
Third Supply Alarm Enable/Disable...................................................... 2-15
SCSI Enable/Disable................................................................................ 2-16
SCSI Termination Enable/Disable.......................................................... 2-16
Watch Dog Enable/Disable .................................................................... 2-16
2-7 Onboard Indicators ...................................................................................... 2-17
Gb LAN LEDs .......................................................................................... 2-17
2-8 Parallel Port, Floppy/Hard Disk Drive and SCSI Connections ............... 2-17
Parallel Port Connector ......................................................................... 2-17
Floppy Connector................................................................................... 2-18
IDE Connectors ...................................................................................... 2-18
Ultra160 SCSI Connector....................................................................... 2-19
2-8 Installing Software Drivers......................................................................... 2-20

SUPER P4DMS-6GM/P4DME-M User’s Manual
vi
Chapter 3: Troubleshooting
3-1 Troubleshooting Procedures ........................................................................ 3-1
Before Power On .................................................................................... 3-1
No Power .................................................................................................. 3-1
No Video ................................................................................................... 3-1
Memory Errors.......................................................................................... 3-2
Losing the System’s Setup Configuration ........................................... 3-2
3-2 Technical Support Procedures .................................................................... 3-2
3-3 Frequently Asked Questions........................................................................ 3-3
3-4 Returning Merchandise for Service............................................................ 3-5
Chapter 4: PhoenixBIOS
4-1 Introduction....................................................................................................... 4-1
4-2 Running Setup.................................................................................................. 4-2
4-3 Main Setup........................................................................................................ 4-2
4-4 Advanced Setup.............................................................................................. 4-6
4-5 Security Setup ............................................................................................... 4-15
4-6 Power Setup .................................................................................................. 4-17
4-7 Boot Setup...................................................................................................... 4-18
4-8 PIR Setup ........................................................................................................ 4-20
4-9 Exit ................................................................................................................... 4-22
Appendices:
Appendix A: PhoenixBIOS POST Messages ....................................................... A-1
Appendix B: PhoenixBIOS POST Codes ...............................................................B-1

Chapter 1: Introduction
1-1
Introduction
Chapter 1
Introduction
1-1 Overview
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.
One (1) Supermicro Mainboard
One (1) ribbon cable for IDE devices
One (1) floppy ribbon cable
One (1) I/O backpanel shield
One (1) Supermicro CD or diskettes containing drivers and utilities
One (1) User's/BIOS Manual
Two (2) Pentium 4 Xeon active heatsinks (FAN-042, retail only)
Two (2) heatsink retention clips (SKT-095)
SCSI Accessories (P4DMS-6GM only)
One (1) 68-pin LVD SCSI cable
One (1) set of SCSI driver diskettes
One (1) SCSI manual

SUPER P4DMS-6GM/P4DME-M User’s Manual
1-2
Introduction
Contacting Supermicro
Headquarters
Address: SuperMicro Computer, Inc.
980 Rock Ave.
San Jose, CA 95131 U.S.A.
Tel: [phone]
Fax: [phone]
Email: [email protected] (General Information)
[email protected] (Technical Support)
Web Site: www.supermicro.com
Europe
Address: SuperMicro Computer B.V.
Het Sterrenbeeld 28, 5215 ML
's-Hertogenbosch, The Netherlands
Tel: [phone]
Fax: [phone]
Email: sal[email protected] (General Information)
[email protected] (Technical Support)
[email protected] (Customer Support)
Asia-Pacific
Address: SuperMicro, Taiwan
D5, 4F, No. 16 Chien-Ba Road
Chung-Ho 235, Taipei Hsien, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
Web Site: www.supermicro.com.tw
Technical Support:
Email: [email protected]
Tel: [phone], ext.132 or 139

Chapter 1: Introduction
1-3
Introduction
Notes

SUPER P4DMS-6GM/P4DME-M User’s Manual
1-4
Introduction
Figure 1-1. SUPER P4DMS-6GM Image

Chapter 1: Introduction
1-5
Introduction
Figure 1-2. SUPER P4DME-M Image

SUPER P4DMS-6GM/P4DME-M User’s Manual
1-6
Introduction
Figure 1-3. SUPER P4DMS-6GM Layout
(not drawn to scale)
The IPMI socket is an optional feature.
Jumpers not noted are for test purposes only.
BANK 1
BANK 2
BANK 3
DIMM #2A
DIMM #1A
DIMM #2B
DIMM #2A
DIMM #3B
ATX PWR CONN
DIMM #3A
Parallel Port
VGA
COM1
USB0/1
Keyboard
Mouse
Mb
LAN
Gb
LAN CPU 2
CPU 1
J15
JP8
MCH
ICH3
P64H2
AIC-7899
Rage
XL Battery
Speaker
COM2
33 MHz PCI #2
33 MHz PCI #1
33 MHz PCI #3
133 MHz PCI-X #6
66 MHz PCI-X #5
IPMI
66 MHz PCI-X #4
J12/IR/CIRWD/PWRLED/SPKR
BIOS
WOL J35
JPA1
FPUSB0/1
USB2
Ultra III LVD SCSI CH A
Ultra III LVD SCSI CHB
Chassis Fan3
JL1
JP32
JWOR1
IDE #2
IDE #1
FLOPPY
IPMB
SMB
JP4
Chassis Fan5
CPU2 Chassis Fan
JF2
CPU1 Chassis Fan
JP36
JP9
JPA2 JP22
JD3
JP3
Chassis Fan4
JOH1
JBT1
JD1JP37
J7
J9
JA1
JA2
JP7
SUPER P4DMS-6GM
®

Chapter 1: Introduction
1-7
Introduction
P4DMS-6GM Quick Reference
Jumper Description Default Setting
JBT1 CMOS Clear See Section 2-6
JPA1/JPA2 SCSI CH A/B Termination Open (Enabled)
JP3/JD3 Mb/Gb LAN Enable/Disable Pins 1-2 (Enabled)
JP4 VGA Enable/Disable Pins 1-2 (Enabled)
JP9 3rd P/S Fail Alarm En/Dis Open (Disabled)
JP22 SCSI Enable/Disable Pins 1-2 (Enabled)
JP37 Watch Dog Enable/Disable Open (Disabled)
Connector Description
ATX PWR CONN Primary ATX Power Connector
DIMM#1A-DIMM#3B Memory (RAM) Slots
COM1/COM2 COM1/COM2 Serial Port Connector
CPU/CHS/OH FAN CPU/Chassis/Overheat Fan Headers
Gb LAN Gb LAN (Ethernet) Port
IDE#1/IDE#2 IDE #1/#2 Hard Disk Drive Connectors
FPUSB0/1 Front Side USB0/1 Headers
J7 Parallel (Printer) Port
J9 PS/2 Keyboard/Mouse Ports
J15* Secondary ATX Power Connector
JA1 Ultra160 LVD SCSI CH A Connector
JA2 Ultra160 LVD SCSI CH B Connector
JD1 PWR LED Header / Speaker Header/Jumper
JF2 Front Control Panel Connector
JL1 Chassis Intrusion Header
JOH1 Overheat LED
JP7 Floppy Disk Drive Connector
JP8 Third Power Supply Fail Header
JP35 Keylock Switch Connector
JP36 3rd Power Supply Alarm Reset Switch
JWOR1 Wake-on-Ring Header
Mb LAN Mb LAN (Ethernet) Port
Speaker Onboard Speaker Header
USB2 USB2 Header
VGA VGA Display (Monitor) Port
WOL Wake-on-LAN Header
* The Secondary 12v 8-pin power connector at J15 must also be
connected to your power supply.

SUPER P4DMS-6GM/P4DME-M User’s Manual
1-8
Introduction
Figure 1-4. SUPER P4DME-M Layout
(not drawn to scale)
The IPMI socket is an optional feature.
Jumpers not noted are for test purposes only.
BANK 1
BANK 2
BANK 3
DIMM #2A
DIMM #1A
DIMM #2B
DIMM #2A
DIMM #3B
ATX PWR CONN
DIMM #3A
Parallel Port
VGA
COM1
USB0/1
Keyboard
Mouse
Mb
LAN CPU 2
CPU 1
J15
JP8
MCH
ICH3
P64H2
Rage
XL Battery
Speaker
COM2
33 MHz PCI #2
33 MHz PCI #1
33 MHz PCI #3
133 MHz PCI-X #6
100 MHz PCI-X #5
IPMI
100 MHz PCI-X #4
J12/IR/CIRWD/PWRLED/SPKR
BIOS
WOL J35 FPUSB0/1
USB2 Chassis Fan3
JL1
JP32
JWOR1
IDE #2
IDE #1
FLOPPY
IPMB
SMB
JP4
Chassis Fan5
CPU2 Chassis Fan
JF2
CPU1 Chassis Fan
JP36
JP9
JP3
Chassis Fan4
JOH1
JBT1
JD1JP37
J7
J9
JP7
SUPER P4DME-M
®

Chapter 1: Introduction
1-9
Introduction
P4DME-M Quick Reference
Jumper Description Default Setting
JBT1 CMOS Clear See Section 2-6
JP3 Mb LAN Enable/Disable Pins 1-2 (Enabled)
JP4 VGA Enable/Disable Pins 1-2 (Enabled)
JP9 3rd P/S Fail Alarm En/Dis Open (Disabled)
JP37 Watch Dog Enable/Disable Open (Disabled)
Connector Description
ATX PWR CONN Primary ATX Power Connector
DIMM#1A-DIMM#3B Memory (RAM) Slots
COM1/COM2 COM1/COM2 Serial Port Connector
CPU/CHS/OH FAN CPU/Chassis/Overheat Fan Headers
IDE#1/IDE#2 IDE #1/#2 Hard Disk Drive Connectors
FPUSB0/1 Front Side USB0/1 Headers
J7 Parallel (Printer) Port
J9 PS/2 Keyboard/Mouse Ports
J15* Secondary ATX Power Connector
JD1 PWR LED Header / Speaker Header/Jumper
JF2 Front Control Panel Connector
JL1 Chassis Intrusion Header
JOH1 Overheat LED
JP7 Floppy Disk Drive Connector
JP8 Third Power Supply Fail Header
JP35 Keylock Switch Connector
JP36 3rd Power Supply Alarm Reset Switch
JWOR1 Wake-on-Ring Header
Mb LAN Mb LAN (Ethernet) Port
Speaker Onboard Speaker Header
USB2 USB2 Header
VGA VGA Display (Monitor) Port
WOL Wake-on-LAN Header
* The Secondary 12v 8-pin power connector at J15 must also be
connected to your power supply.

SUPER P4DMS-6GM/P4DME-M User’s Manual
1-10
Introduction
Motherboard Features
CPU
• Single or dual Intel®603-pin XeonTM 512K L2 cache processors at up
to 2.8 GHz at a 400 MHz front side (system) bus speed.
Note: Please refer to the support section of our web site for a complete listing of supported
processors (http://www.supermicro.com/TechSupport.htm).
Memory
• Six 184-pin DDR DIMM sockets supporting up to 12 GB of registered
ECC DDR-200 (PC1600) DDR SDRAM
Note: Interleaved memory; requires memory modules to be installed in pairs. DDR-266
(PC2100) memory is supported but only at 200 MHz. Do not mix memory sizes and speeds. See
Section 2-3 for details.
Chipset
• Intel E7500 (Plumas) chipset
Expansion Slots
P4DMS-6GM P4DME-M
• One 64-bit, 133 MHz PCI-X • One 64-bit, 133 MHz PCI-X
• Two 64-bit, 66 MHz PCI-X • Two 64-bit, 100 MHz PCI-X
• Three 32-bit, 33 MHz PCI • Three 32-bit, 33 MHz PCI
BIOS
• 4 Mb Phoenix®Flash ROM
• APM 1.2, DMI 2.1, PCI 2.2, ACPI 1.0, Plug and Play (PnP), SMBIOS 2.3
PC Health Monitoring
• Onboard voltage monitors for CPU cores, chipset voltage, 3.3V, +5V,
+12V and 3.3V standby
• Fan status monitor with firmware/software on/off control
• CPU/chassis temperature monitors
• Environmental temperature monitor and control
• CPU fan auto-off in sleep mode
• CPU slow-down on temperature overheat
• CPU overheat LED header
• Power-up mode control for recovery from AC power loss
• Auto-switching voltage regulator for CPU core
• Chassis intrusion detection

Chapter 1: Introduction
1-11
Introduction
• System resource alert
ACPI/PC 98 Features (optional)
• Microsoft OnNow
• Slow blinking LED for suspend state indicator
• Main switch override mechanism
• External modem ring-on
Onboard I/O
• AIC-7899 for dual channel Ultra160 SCSI (P4DMS-6GM only)
• Zero channel RAID slot (green PCI-X slot)
• Integrated ATI Rage XL graphics controller
• One Intel 82550 10/100 fast Ethernet and one Intel Gb Ethernet port
(P4DMS-6GM)
• One Intel 82550 10/100 fast Ethernet port (P4DME-M)
• 2 EIDE Ultra DMA/100 bus master interfaces
• 1 floppy port interface (up to 2.88 MB)
• 2 Fast UART 16550A compatible serial ports
• 1 EPP/ECP Parallel Port (Enhanced Parallel Port/Extended Capabilities
Port)
• PS/2 mouse and PS/2 keyboard ports
• Two USB (Universal Serial Bus) ports, three USB headers (USB 1.1)
Other
• Internal/external modem ring-on
• Recovery from AC power loss control
• Wake-on-LAN (WOL)
• Console redirection
• IPMI (optional)
CD/Diskette Utilities
• BIOS flash upgrade utility
• Device drivers
Dimensions
• P4DMS-6GM: Extended ATX, 12" x 13.05" (304.8 x 331.5 mm)
• P4DME-M: Extended ATX, 12" x 13.05" (304.8 x 331.5 mm)

SUPER P4DMS-6GM/P4DME-M User’s Manual
1-12
Introduction
Figure 1-5. Intel E7500 Chipset:
System Block Diagram
Note: This is a general block diagram. Please see the previous Motherboard
Features pages for details on the features of each motherboard. (Because the
P4DME-M has no onboard SCSI controller, PCI-X slots #4 and 5 run on a 100
MHz PCI-X bus.)
MCH
400 MHz Host Bus
200 MHz
Memory Bus
P64H2
Processor Processor
DDR-200
ICH3
66 MHz
PCI Bus
PCI-X Slot
#5 & RAID
PCI-X
Slot #4
SCSI
PCI-X Slot
#6, VXB &
Riser
Gbit LAN
100 MHz
PCI-X Bus
IDE
Audio
CODEC
USB Ports
LPC I/O BIOS FWH
PCI Slot #1
UDMA/100
USB 1.1
AC97
PCI Slot #3
PCI Slot #2
VGA
Mbit LAN
33 MHz PCI Bus
LPC Bus

Chapter 1: Introduction
1-13
Introduction
1-2 Chipset Overview
The Intel E7500 (Plumas) chipset is a high-performance chipset with a per-
formance and feature-set designed for mid-range, dual processor servers.
The E7500 chipset consists of four major components: the Memory Control-
ler Hub (MCH), the I/O Controller Hub 3 (ICH3), the PCI-X 64-bit Hub 2.0
(P64H2) and the 82808AA Host Channel Adapter (VxB).
The MCH has four hub interfaces, one to communicate with the ICH3 and
three for high-speed I/O communications. The MCH employs a 144-bit wide
memory bus for a DDR-200 memory interface, which provides a total band-
width of 3.2 GB/s. The ICH3 interface is a 266 MB/sec point-to-point con-
nection using an 8-bit wide, 66 MHz base clock at a 4x data transfer rate.
The P64H2 interface is a 1 GB/s point-to-point connection using a 16-bit
wide, 66 MHz base clock at a 8x data transfer rate.
The ICH3 I/O Controller Hub provides various integrated functions, including
a two-channel UDMA100 bus master IDE controller, USB host controllers, an
integrated LAN controller, a System Management Bus controller and an
AC'97 compliant interface.
The P64H2 PCI-X Hub provides a 16-bit connection to the MCH for high-
performance I/O capability and two 64-bit PCI-X interfaces.
1-3 Special Features
ATI Graphics Controller
The P4DMS-6GM/P4DME-M has an integrated ATI video controller based on
the Rage XL graphics chip. The Rage XL fully supports sideband address-
ing and AGP texturing. This onboard graphics package can provide a band-
width of up to 512 MB/sec over a 32-bit graphics memory bus.
BIOS Recovery
The BIOS Recovery function allows you to recover your BIOS image file if
the BIOS flashing procedure fails (see Section 3-3).

SUPER P4DMS-6GM/P4DME-M User’s Manual
1-14
Introduction
Recovery from AC Power Loss
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 hit the
power switch to turn it back on) or for it to automatically return to a power-
on state. See the Power Lost Control setting in the Advanced BIOS Setup
section (Peripheral Device Configuration) to change this setting. The de-
fault setting is Always On.
1-4 PC Health Monitoring
This section describes the PC health monitoring features of the SUPER
P4DMS-6GM/P4DME-M. The motherboard has an onboard System Hardware
Monitor chip that supports PC health monitoring.
Onboard Voltage Monitors for the CPU Cores, Chipset
Voltage, +3.3V, +5V, +12V and +3.3V Standby
An onboard voltage monitor will scan these voltages continuously. Once a
voltage becomes unstable, a warning is given or an error message is sent
to the screen. Users can adjust the voltage thresholds to define the
sensitivity of the voltage monitor.
Fan Status Monitor with Firmware/Software On/Off Control
The PC health monitor can check the RPM status of the cooling fans. The
onboard 3-pin CPU and chassis fans are controlled by the power manage-
ment functions. The thermal fan is controlled by the overheat detection
logic.
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 threshold. The overheat circuitry runs independently from the CPU. It can
continue to monitor for overheat conditions even when the CPU is in sleep
mode. Once it detects that the CPU temperature is too high, it will automati-
cally turn on the thermal control fan to prevent any overheat damage to the
CPU. The onboard chassis thermal circuitry can monitor the overall system
temperature and alert users when the chassis temperature is too high.