Asus EX-B660M-V5 D4 User manual

Motherboard
EX-B660M-V5 D4

ii
E19257
First Edition
October 2021
Copyright © 2021 ASUSTeK COMPUTER INC. All Rights Reserved.
No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any
means, except documentation kept by the purchaser for backup purposes, without the express written
permission of ASUSTeK COMPUTER INC. (“ASUS”).
Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the
product is defaced or missing.
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS
DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS,
LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE),
EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY
DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE,
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO
RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS
MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Products and corporate names appearing in this manual may or may not be registered trademarks or
copyrights of their respective companies, and are used only for identication or explanation and to the
owners’ benet, without intent to infringe.

iii
Contents
Safety information...................................................................................................... iv
About this guide.......................................................................................................... v
Package contents....................................................................................................... vi
EX-B660M-V5 D4 specifications summary............................................................... vi
Chapter 1 Product Introduction
1.1 Before you proceed...................................................................................... 1-1
1.2 Motherboard overview .................................................................................1-1
1.3 Central Processing Unit (CPU).................................................................... 1-7
1.4 System memory............................................................................................ 1-9
Chapter 2 BIOS Information
2.1 BIOS Setup program .................................................................................... 2-1
2.2 I-Cafe..............................................................................................................2-2
2.3 Main menu..................................................................................................... 2-3
2.4 Advanced menu............................................................................................ 2-4
2.5 Monitor menu................................................................................................ 2-6
2.6 Boot menu..................................................................................................... 2-7
2.7 Exit menu ......................................................................................................2-8
Appendix
Notices ..................................................................................................................... A-1
Warranty................................................................................................................... A-6
ASUS contact information...................................................................................... A-8
Service and Support ............................................................................................... A-8

iv
Safety information
Electrical safety
• To prevent electrical shock hazard, disconnect the power cable from the electrical outlet
before relocating the system.
• When adding or removing devices to or from the system, ensure that the power cables
for the devices are unplugged before the signal cables are connected. If possible,
disconnect all power cables from the existing system before you add a device.
• Before connecting or removing signal cables from the motherboard, ensure that all power
cables are unplugged.
• Seek professional assistance before using an adapter or extension cord. These devices
could interrupt the grounding circuit.
• Ensure that your power supply is set to the correct voltage in your area. If you are not
sure about the voltage of the electrical outlet you are using, contact your local power
company.
• If the power supply is broken, do not try to x it by yourself. Contact a qualied service
technician or your retailer.
Operation safety
• Before installing the motherboard and adding components, carefully read all the manuals
that came with the package.
• Before using the product, ensure all cables are correctly connected and the power cables
are not damaged. If you detect any damage, contact your dealer immediately.
• To avoid short circuits, keep paper clips, screws, and staples away from connectors,
slots, sockets and circuitry.
• Avoid dust, humidity, and temperature extremes. Do not place the product in any area
where it may be exposed to moisture.
• Place the product on a stable surface.
• If you encounter technical problems with the product, contact a qualied service
technician or your retailer.
• Your motherboard should only be used in environments with ambient temperatures
between 0°C and 40°C.

v
About this guide
This user guide contains the information you need when installing and conguring the
motherboard.
How this guide is organized
This guide contains the following parts:
• Chapter 1: Product Introduction
This chapter describes the features of the motherboard and the new technology it
supports. It includes descriptions of the switches, jumpers, and connectors on the
motherboard.
• Chapter 2: BIOS Information
This chapter tells how to boot into the BIOS and upgrade BIOS using the EZ Flash
Utility.
Where to find more information
Refer to the following sources for additional information and for product and software
updates.
1. ASUS website
The ASUS website provides updated information on ASUS hardware and software
products. Refer to the ASUS contact information.
2. Optional documentation
Your product package may include optional documentation, such as warranty flyers,
that may have been added by your dealer. These documents are not part of the
standard package.
Conventions used in this guide
To ensure that you perform certain tasks properly, take note of the following symbols used
throughout this manual.
CAUTION: Information to prevent damage to the components and injuries to yourself when
trying to complete a task.
IMPORTANT: Instructions that you MUST follow to complete a task.
NOTE: Tips and additional information to help you complete a task.

vi
EX-B660M-V5 D4 specifications summary
CPU
Intel®Socket LGA1700 for 12th Gen Intel®Core™, Pentium®Gold and
Celeron®Processors*
Supports Intel®Turbo Boost Technology 2.0 and Intel®Turbo Boost Max
Technology 3.0**
*Refer to www.asus.com for CPU support list.
**Intel®Turbo Boost Max Technology 3.0 support depends on the CPU types.
Chipset Intel®B660 Chipset
Memory
2 x DIMM, Max. 64GB, DDR4 5333(OC)/5000(OC)/4800(OC)/4600(OC)/
4400(OC)/4266(OC)/4000(OC)/3733(OC)/3600(OC)/3466(OC)/3400(OC)/
3333(OC)/3200/3000/2933/2800/2666/2400/2133 Non-ECC, Un-buffered
Memory*
Dual Channel Memory Architecture
Supports Intel® Extreme Memory Prole (XMP)
*Actual memory data rate depends on the CPU types and DRAM modules, for more
information refer to www.asus.com for memory support list.
Graphics
1 x D-Sub port
1 x HDMI®port**
*Graphics specifications may vary between CPU types. Please refer to
www.intel.com for any updates.
**Supports 4K@60Hz as specified in HDMI 2.1.
Expansion Slots
Intel®12th Gen Processors
1 x PCIe 4.0/3.0 x16 slot
Intel®B660 Chipset
2 x PCIe 3.0 x1 slots
Storage
Total supports 2 x M.2 slots and 4 x SATA 6Gb/s ports*
Intel®12th Gen Processors
M.2_1 slot (Key M), type 2242/2260/2280
- Intel®12th Gen processors support PCIe 4.0 x4 mode.
Intel®B660 Chipset
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
4 x SATA 6Gb/s ports
*Intel®Rapid Storage Technology supports SATA RAID 0/1/5/10.
(continued on the next page)
Package contents
Check your motherboard package for the following items.
Motherboard 1 x EX-B660M-V5 D4 motherboard
Cables 2 x SATA 6Gb/s cables
Miscellaneous 1 x I/O Shield
2 x M.2 Anchors
Application DVD 1 x Support DVD
Documentation 1 x User guide
If any of the above items is damaged or missing, contact your retailer.

vii
EX-B660M-V5 D4 specifications summary
Ethernet 1 x Realtek 1Gb Ethernet
USB
Rear USB (Total 6 ports)
4 x USB 3.2 Gen 1 ports (4 x Type-A)
2 x USB 2.0 ports (2 x Type-A)
Front USB (Total 6 ports)
1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports
2 x USB 2.0 headers support additional 4 USB 2.0 ports
Audio
Realtek 7.1 Surround Sound High Definition Audio CODEC*
- Supports: Jack detection, Multi-streaming, Front Panel Jack-retasking
- Supports up to 24-Bit/192 kHz playback
Audio Features
- Premium audio capacitors
- Audio Shielding
- Dedicated audio PCB layers
*A chassis with an HD audio module in the front panel is required to support 7.1
Surround Sound audio output.
Back Panel I/O Ports
4 x USB 3.2 Gen 1 ports (4 x Type-A)
2 x USB 2.0 ports (2 x Type-A)
1 x D-Sub port
1 x HDMI®port
1 x Realtek 1Gb Ethernet port
3 x Audio jacks
1 x PS/2 Keyboard/Mouse combo port
Internal I/O
Connectors
Fan and Cooling related
1 x 4-pin CPU Fan header
1 x 4-pin Chassis Fan header
Power related
1 x 24-pin Main Power connector
1 x 8-pin +12V Power connector
Storage related
2 x M.2 slots (Key M)
4 x SATA 6Gb/s ports
USB
1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports
2 x USB 2.0 headers support additional 4 USB 2.0 ports
Miscellaneous
1 x Clear CMOS header
1 x Front Panel Audio header (AAFP)
1 x Speaker header
1 x 10-1 pin System Panel header
(continued on the next page)

viii
EX-B660M-V5 D4 specifications summary
Special Features
ASUS 5X PROTECTION III
- DIGI+ VRM
- LANGuard
- Overvoltage Protection
- SafeSlot Core+
- Stainless-Steel Back I/O
ASUS Q-Design
- Q-DIMM
- Q-Slot
Non-stop Action
- Lightning Boot
Non-stop Challenger
- ASUS iCafe labs certied
Non-stop Durability
- Luminous anti-moisture coating
- USBGuard
BIOS 128 Mb Flash ROM, UEFI AMI BIOS
Manageability WOL by PME, PXE
Operating
System
Windows®11 64-bit
Windows®10 64-bit
Form Factor mATX Form Factor
9.6 inch x 8.3 inch (24.4 cm x 21.1 cm)
Specications are subject to change without notice. Refer to the ASUS website for the
latest specications.

1-1
Product Introduction
1.1 Before you proceed
Take note of the following precautions before you install motherboard components or change
any motherboard settings.
• Unplug the power cord from the wall socket before touching any component.
• Before handling components, use a grounded wrist strap or touch a safely grounded
object or a metal object, such as the power supply case, to avoid damaging them due
to static electricity.
• Before you install or remove any component, ensure that the ATX power supply is
switched off or the power cord is detached from the power supply. Failure to do so
may cause severe damage to the motherboard, peripherals, or components.
Unplug the power cord before installing or removing the motherboard. Failure to do so can
cause you physical injury and damage motherboard components.
The pin denitions in this chapter are for reference only. The pin names depend on the
location of the header/jumper/connector.
1.2 Motherboard overview
Place this
side towards
the rear of the
chassis
LGA1700
DDR4 DIMM_A1 (64bit, 288-pin module) DDR4 DIMM_B1 (64bit, 288-pin module)
CPU_FAN
DIGI+
VRM
CHA_FAN
F_PANEL
COM_DEBUG
SATA6G_1
CLRTC SATA6G_2 SATA6G_3
SATA6G_4
128Mb
BIOS
ATX_12V
ATX_PWR
U32G1_12
BATTERY
HDMI
KBMS_USB_56
VGA
LAN_U32G1_34
U32G1_910
Super
I/O
PCIEX1(G3)_2
PCIEX1(G3)_1
M.2_2(SOCKET3)
M.2_1(SOCKET3)
2280 2260 2242
2242 2260 2280
PCIEX16(G4)
USB_1114USB_78
AAFP
24.4cm(9.6in)
AUDIO
M.2_2(SOCKET3)
PCIE SATA Optane Memory
4.0 X4 X V
SPEAKER
Intel®
B660
21.1cm(8.3in)
Ethernet
Audio
CODEC
M.2_1(SOCKET3)
PCIE SATA
4.0 X4 X
7
6
5
8
11
3
5 1 2106 4
13129 10 7
4
1
ASUS EX-B660M-V5 D4

1-2
1.2.1 Layout contents
1. CPU socket
The motherboard comes with a LGA1700 socket designed for 12th Gen Intel®Core™,
Pentium®Gold and Celeron®Processors.
For more details, refer to Central Processing Unit (CPU).
2. DDR4 DIMM slots
The motherboard comes with Dual Inline Memory Modules (DIMM) slots designed for DDR4
(Double Data Rate 4) memory modules.
For more details, refer to System memory.
3. Expansion slots
This motherboard supports one PCIe 4.0 x16 graphics card and two PCIe 3.0 x1 network
cards, SCSI cards and other cards that comply with the PCI Express specications.
4. Fan headers
The Fan headers allow you to connect fans to cool the system.
5. Power connectors
These Power connectors allow you to connect your motherboard to a power supply. The
power supply plugs are designed to t in only one orientation. Find the proper orientation and
push down rmly until the power supply plugs are fully inserted.
Ensure to connect the 8-pin power plug.
• We recommend that you use a PSU with a higher power output when conguring a
system with more power-consuming devices. The system may become unstable or
may not boot up if the power is inadequate.
• If you are uncertain about the minimum power supply requirement for your system, we
recommend you to refer to online resources for Power Supply Wattage Calculator.
6. M.2 slots (Key M)
The M.2 slots allow you to install M.2 devices such as M.2 SSD modules.
• Intel®12th Gen processors:
M.2_1 slot (Key M), type 2242/2260/2280
- Intel®12th Gen processors support PCIe 4.0 x4 mode
• Intel®B660 Chipset:
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
7. SATA 6Gb/s ports
The SATA 6Gb/s ports allow you to connect SATA devices such as optical disc drives and
hard disk drives via SATA cables.
FAN PWM
FAN IN
FAN PWR
GND
FAN PWM
FAN IN
FAN PWR
GND
Chapter 1: Product Introduction

1-3
8. USB 3.2 Gen 1 header
The USB 3.2 Gen 1 header allows you to connect a USB 3.2 Gen
1 module for additional USB 3.2 Gen 1 ports. The USB 3.2 Gen 1
header provides data transfer speeds of up to 5 Gb/s.
The USB 3.2 Gen 1 module is purchased separately.
9. USB 2.0 headers
The two USB 2.0 headers allow you to connect USB modules for additional
four USB 2.0 ports. The USB 2.0 headers provide data transfer speeds of up
to 480 Mb/s.
DO NOT connect a 1394 cable to the USB connectors. Doing so will
damage the motherboard!
The USB 2.0 module is purchased separately.
10. Clear CMOS header
This header allows you to clear the CMOS RTC RAM data of the system setup
information such as date, time, and system passwords.
To erase the RTC RAM:
1. Turn OFF the computer and unplug the power cord.
2. Use a metal object such as a screwdriver to short the two pins.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot process and enter BIOS setup to re-
enter data.
If the steps above do not help, remove the onboard battery and short the two pins again to
clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the battery.
11. Front panel audio header
This header is for a chassis-mounted front panel audio I/O module that
supports HD audio standard. Connect one end of the front panel audio
I/O module cable to this header.
• We recommend that you connect a high-denition front panel
audio module to this header to avail of the motherboard’s high-
denition audio capability.
• If you want to connect a high-denition front panel audio
module to this header, set the Front Panel Type item in the
BIOS setup to [HD Audio]. By default, this header is set to [HD
Audio].
12. Speaker header
The 4-pin header is for the chassis-mounted system warning speaker. The
speaker allows you to hear system beeps and warnings.
USB3+5V
IntA_P1_SSRX-
IntA_P1_SSRX+
GND
IntA_P1_SSTX-
IntA_P1_SSTX+
GND
IntA_P1_D-
IntA_P1_D+
GND
PIN 1
USB3+5V
IntA_P2_SSRX-
IntA_P2_SSRX+
GND
IntA_P2_SSTX-
IntA_P2_SSTX+
GND
IntA_P2_D-
IntA_P2_D+
PIN 1
USB+5V USB_P1- USB_P1+ GND NC
USB+5V
USB_P2-
USB_P2+
GND
CLRTC
+3V_BAT GND
PIN 1
AAFP
AGND NC SENSE1_RETUR SENSE2_RETUR
PORT1 L
PORT1 R PORT2 R
SENSE_SEND
PORT2 L
HD-audio-compliant
pin definition
+5V GND GND Speaker Out
SPEAKER
PIN 1
ASUS EX-B660M-V5 D4

1-4
13. 10-1 pin System Panel header
This header supports several chassis-mounted functions.
• System power LED (2-pin +PWR_LED-)
This 2-pin header is for the system power LED. Connect the chassis
power LED cable to this header. The system power LED lights up
when you turn on the system power, and blinks when the system is in
sleep mode.
• Hard disk drive activity LED (2-pin +HDD_LED-)
This 2-pin header is for the HDD Activity LED. Connect the HDD
Activity LED cable to this header. The HDD LED lights up or flashes
when data is read from or written to the HDD.
• Power button/Soft-off button (2-pin PWR_BTN)
This header is for the system power button.
• Reset button (2-pin RESET)
This 2-pin header is for the chassis-mounted reset button for system reboot without
turning off the system power.
PIN 1
PWR_BTN
PWR_LED+ PWR_LED- PWR GND
HDD_LED+
HDD_LED-
Ground
HWRST#
(NC)
F_PANEL
+PWR_LED-
+HDD_LED- RESET
Chapter 1: Product Introduction

1-5
1.2.2 Rear panel connectors
1. PS/2 Keyboard/Mouse combo port. This port is for a PS/2 keyboard or mouse.
2. Video Graphics Adapter (VGA) port. This 15-pin port is for a VGA monitor or other
VGA-compatible devices.
3. Ethernet port. This port allows Gigabit connection to a Local Area Network (LAN)
through a network hub. Refer to the table below for the Ethernet port LED indications.
Ethernet port LED indications
1 2
6 87 9
3 4 5
4. Line In port (light blue). This port connects the tape, CD, DVD player, or other audio
sources.
5. Line Out port (lime). This port connects a headphone or a speaker. In 4-channel,
5.1-channel, and 7.1-channel congurations, the function of this port becomes Front
Speaker Out.
6. USB 2.0 ports. These 4-pin Universal Serial Bus (USB) port are for USB 2.0 devices.
7. HDMI®port. This port is for a High-Denition Multimedia Interface (HDMI®) connector,
and is HDCP compliant allowing playback of HD DVD, Blu-ray, and other protected
content.
8. USB 3.2 Gen 1 (up to 5Gbps) ports. These 9-pin Universal Serial Bus (USB) ports
connect to USB 3.2 Gen 1 devices.
ACT/LINK
LED SPEED
LED
Ethernet port
ASUS EX-B660M-V5 D4
Speed LED
Status Description
OFF 10 Mbps connection
ORANGE 100 Mbps connection
GREEN 1 Gbps connection
Activity Link LED
Status Description
OFF No link
ORANGE Linked
BLINKING Data activity

1-6
9. Microphone port (pink). This port connects a microphone.
Refer to the audio conguration table for the function of the audio ports in 2, 4, 5.1, or
7.1-channel conguration.
Audio 2, 4, 5.1 or 7.1-channel configuration
Port Headset
2-channel 4-channel 5.1-channel 7.1-channel
Light Blue
(Rear panel) Line In Rear Speaker Out Rear Speaker Out Rear Speaker Out
Lime (Rear panel) Line Out Front Speaker Out Front Speaker Out Front Speaker Out
Pink (Rear panel) Mic In Mic In Bass/Center Bass/Center
Lime (Front panel) — — — Side Speaker Out* /
Headphone
Pink (Front panel) — — — Mic In* / Side
Speaker Out
* Multi-streaming is disabled by default, and the Lime (front panel) jack may be used as Side Speaker Out. If
multi-streaming is enabled, the Lime (front panel) jack will support headphone, and Pink (front panel) jack
will support Side Speaker Out.
To configure a 7.1-channel audio output:
Use a chassis with HD audio module in the front panel to support a 7.1-channel audio
output.
Chapter 1: Product Introduction

1-7
1.3 Central Processing Unit (CPU)
The motherboard comes with a LGA1700 socket designed for 12th Gen
Intel®Core™, Pentium®Gold and Celeron®Processors.
Unplug all power cables before installing the CPU.
• Ensure that you install the correct CPU designed for LGA1700 socket only. DO NOT
install a CPU designed for LGA1155, LGA1156, LGA1151, and LGA1200 sockets on
the LGA1700 socket.
• Upon purchase of the motherboard, ensure that the PnP cap is on the socket and
the socket contacts are not bent. Contact your retailer immediately if the PnP cap
is missing, or if you see any damage to the PnP cap/socket contacts/motherboard
components. ASUS will shoulder the cost of repair only if the damage is shipment/
transit-related.
• Keep the cap after installing the motherboard. ASUS will process Return Merchandise
Authorization (RMA) requests only if the motherboard comes with the cap on the
LGA1700 socket.
• ASUS will not cover damages resulting from incorrect CPU installation/removal,
incorrect CPU orientation/placement, or other damages resulting from negligence by
the user.
Installing the CPU
Take caution when lifting the load
lever, ensure to hold onto the load
lever when releasing the load
lever. Letting go of the load lever
immediately after releasing it may
cause the load lever to spring
back and cause damage to your
motherboard.
ASUS EX-B660M-V5 D4

1-8
Apply the Thermal Interface Material to the CPU heatsink and CPU before you install the
heatsink and fan if necessary.
Chapter 1: Product Introduction

1-9
1.4 System memory
This motherboard comes with two Double Data Rate 4 (DDR4) Dual Inline Memory Module
(DIMM) sockets. The gure illustrates the location of the DDR4 DIMM sockets:
Channel Sockets
Channel A DIMM_A1
Channel B DIMM_B1
• You may install varying memory sizes in Channel A and Channel B. The system
maps the total size of the lower-sized channel for the dual-channel conguration. Any
excess memory from the higher-sized channel is then mapped for single-channel
operation.
• Always install DIMMs with the same CAS latency. For optimal compatibility, we
recommend that you install memory modules of the same version or date code (D/C)
from the same vendor. Check with the retailer to get the correct memory modules.
• The default memory operation frequency is dependent on its Serial Presence Detect
(SPD), which is the standard way of accessing information from a memory module.
Under the default state, some memory modules for overclocking may operate at a
lower frequency than the vendor-marked value.
• For system stability, use a more efcient memory cooling system to support a full
memory load.
• Actual memory data rate depends on the CPU types and DRAM modules, for more
information refer to www.asus.com for memory support list.
Recommended memory configurations
DIMM_A1
DIMM_B1
DIMM_B1 DIMM_A1
DIMM_B1*
DIMM_A1*
ASUS EX-B660M-V5 D4

1-10
Installing a DIMM
1 2
B
A
A
To remove a DIMM
B
A
Chapter 1: Product Introduction

2-1
BIOS Information
Scan the QR code to view the BIOS update guide.
2.1 BIOS Setup program
Use the BIOS Setup program to update the BIOS or congure its parameters. The BIOS
screens include navigation keys and brief online help to guide you in using the BIOS Setup
program.
Entering BIOS Setup at startup
To enter BIOS Setup at startup:
Press <Delete> or <F2> during the Power-On Self Test (POST). If you do not press <Delete>
or <F2>, POST continues with its routines.
Entering BIOS Setup after POST
To enter BIOS Setup after POST:
• Press <Ctrl>+<Alt>+<Del> simultaneously.
• Press the reset button on the system chassis.
• Press the power button to turn the system off then back on. Do this option only if you
failed to enter BIOS Setup using the rst two options.
Using the power button, reset button, or the <Ctrl>+<Alt>+<Del> keys to force reset from a
running operating system can cause damage to your data or system. We recommend you
always shut down the system properly from the operating system.
• The BIOS Setup screens shown in this section are for reference purposes only, and
may not exactly match what you see on your screen.
• Visit the ASUS website at www.asus.com to download the latest BIOS le for this
motherboard.
• If the system becomes unstable after changing any BIOS setting, load the default
settings to ensure system compatibility and stability. Select the Load Optimized
Defaults item under the Exit menu or press hotkey <F5>.
• If the system fails to boot after changing any BIOS setting, try to clear the CMOS and
reset the motherboard to the default value. See section Motherboard overview for
information on how to erase the RTC RAM.
BIOS menu screen
The BIOS Setup program can be used under the Advanced Mode.
ASUS EX-B660M-V5 D4

2-2
2.2 I-Cafe
The items in this menu allows you to congure some quick settings for the I-Cafe feature.
Realtek PXE Option ROM
This item allows you to enable or disable the PXE OptionRom of the Realtek LAN controller.
POST Delay Time
This item appears only when you set Boot Logo Display to [Auto] and [Full Screen]. This item
allows you to select the desired additional POST waiting time to easily enter the BIOS Setup.
You can only execute the POST delay time during Normal Boot. The values range from 0 to
10 seconds.
Wait for ‘F1’ If Error
When this item is set to [Enabled], the system waits for the <F1> key to be pressed when
error occurs.
USB Keyboard and Mouse Simulator
This item allows you to simulate the USB keyboard and mouse to PS/2 module in Windows®
7. Ensure to install the USB driver in your system before disabling this item.
USB power delivery in Soft Off state (S5)
[Enabled] Charges USB devices even when the system is in Power State S5.
[Disabled] Disables this function.
CSM Status Auto Selection
Allows you to enable or disable the CSM status auto selection function.
ASUS Performance Enhancement
This item allows the CPU to maintain boost frequencies longer for a better performance.
Chapter 2: BIOS Information