Asus PRIME B660M-A WIFI D4 User manual

Brand: Asus

Model: PRIME B660M-A WIFI D4

Category: Motherboards

Type: User manual

This manual is also suitable for

PRIME B660M-A WIFI D4-CSM

Motherboard

PRIME

B660M-A WIFI D4

E19950

Revised Edition V2

February 2022

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

PRIME B660M-A WIFI D4 specications 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) .................................................................... 1-8

1.4 System memory .......................................................................................... 1-10

1.5 M.2 installation ............................................................................................ 1-12

Chapter 2 BIOS and RAID Support

2.1 Knowing BIOS ............................................................................................... 2-1

2.2 BIOS Setup program .................................................................................... 2-2

2.3 ASUS EZ Flash 3 ........................................................................................... 2-3

2.4 ASUS CrashFree BIOS 3 .............................................................................. 2-4

2.5 RAID congurations ..................................................................................... 2-5

Appendix

Notices ..................................................................................................................... A-1

Warranty ................................................................................................................... A-8

ASUS contact information .................................................................................... A-10

Service and Support ............................................................................................. A-10

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.

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 and RAID Support

This chapter tells how to boot into the BIOS, upgrade BIOS using the EZ Flash Utility

and support on RAID.

Where to nd 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.

PRIME B660M-A WIFI D4 specications 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

4 x DIMM, Max. 128GB, DDR4 5333(OC)/5066(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)

OptiMem II

* Actual Memory data rate depends on the CPU types and DRAM modules, for more

information refer to

www.asus.com

for the Memory QVL (Qualied Vendors Lists).

Graphics

1 x DisplayPort**

2 x HDMI® ports***

Graphics specications may vary between CPU types.

Please refer to

www.intel.com

for any updates.

** Support max. 4K@60Hz as specied in DisplayPort 1.4.

*** Support 4K@60Hz as specied in HDMI

2.1.

Expansion Slots

Intel® 12th Gen Processors

1 x PCIe 4.0/3.0 x16 slot

Intel® B660 Chipset*

1 x PCIe 3.0 x16 slot (supports x4 mode)

1 x PCIe 3.0 x16 slot (supports x1 mode)

Supports Intel

Optane Memory H Series on PCH-attached PCIe slot.

(continued on the next page)

Package contents

Check your motherboard package for the following items.

Motherboard 1 x PRIME B660M-A WIFI D4 motherboard

Cables 2 x SATA 6Gb/s cables

Miscellaneous

1 x ASUS Wi-Fi moving antennas

1 x I/O Shield

1 x M.2 Rubber Package

1 x M.2 SSD screw package

Installation Media 1 x Support DVD

Documentation 1 x User Guide

If any of the above items is damaged or missing, contact your retailer.

vii

PRIME B660M-A WIFI D4 specications summary

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.

** Intel® Rapid Storage Technology supports Intel® Optane Memory H Series on

PCH attached M.2 slots.

Ethernet 1 x Intel® 1Gb Ethernet

Wireless & Bluetooth

Wi-Fi 6

2x2 Wi-Fi 6 (802.11 a/b/g/n/ac/ax)

Supports 2.4/5GHz frequency band

Bluetooth v5.2

USB

Rear USB (Total 6 ports)

2 x USB 3.2 Gen 2 ports (2 x Type-A )

4 x USB 2.0 ports (4 x Type-A)

Front USB (Total 10 ports)

2 x USB 3.2 Gen 1 headers support additional 4 USB 3.2 Gen 1 ports

1 x USB 3.2 Gen 1 connector (supports USB Type-C®)

2 x USB 2.0 headers support additional 4 USB 2.0 ports

1 x USB 2.0 header supports additional 1 USB 2.0 port

Audio

Realtek 7.1 Surround Sound High Denition Audio CODEC*

- Supports: Jack detection, Multi-streaming, Front Panel Jack-retasking

- Supports up to 24-Bit/192kHz playback

Audio Features

- Audio Shielding

- Premium audio capacitors

- 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

2 x USB 3.2 Gen 2 ports (2 x Type-A)

4 x USB 2.0 ports (4 x Type-A)

1 x DisplayPort

2 x HDMI® ports

1 x Wi-Fi Module

1 x Intel® 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 CPU OPT Fan header

2 x 4-pin Chassis Fan headers

(continued on the next page)

viii

PRIME B660M-A WIFI D4 specications summary

Internal I/O

Connectors

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

2 x USB 3.2 Gen 1 headers support additional 4 USB 3.2 Gen 1 ports

1 x USB 3.2 Gen 1 connector (supports USB Type-C®)

2 x USB 2.0 headers support additional 4 USB 2.0 ports

1 x USB 2.0 header supports additional 1 USB 2.0 port

Miscellaneous

3 x Addressable Gen 2 headers

1 x AURA RGB header

1 x Clear CMOS header

1 x COM Port header

1 x Front Panel Audio header (AAFP)

1 x LPT header

1 x S/PDIF Out header

1 x SPI TPM header (14-1pin)

1 x 20-3 pin System Panel header with Chassis intrude function

Special Features

ASUS 5X PROTECTION III

- DIGI+ VRM

- Enhanced DRAM Overcurrent Protection

- ESD Guards

- LANGuard

- Overvoltage Protection

- SafeSlot Core+

- Stainless-Steel Back I/O

ASUS Q-Design

- Q-DIMM

- Q-Slot

ASUS Thermal Solution

- M.2 heatsink

- VRM heatsink design

ASUS EZ DIY

- ProCool

AURA Sync

- AURA RGB header

- Addressable Gen 2 headers

Software Features

ASUS Exclusive Software

Armoury Crate

- AURA Creator

(continued on the next page)

PRIME B660M-A WIFI D4 specications summary

Software Features

- AURA Sync

- Fan Xpert 2+

AI Suite 3

- Performance And Power Saving Utility

TurboV EVO

EPU

DIGI+ VRM

ASUS CPU-Z

Norton Anti-virus software (Free Trial version)

WinRAR

UEFI BIOS

ASUS EZ DIY

- ASUS CrashFree BIOS 3

- ASUS EZ Flash 3

- ASUS UEFI BIOS EZ Mode

BIOS 128Mb 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 9.6 inch (24.4 cm x 24.4 cm)

Specications are subject to change without notice. Refer to the ASUS website for the

latest specications.

1-1

PRIME B660M-A WIFI D4

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.

1.2 Motherboard overview

Place this

side towards

the rear of the

chassis

DDR4 DIMM_A1 (64bit, 288-pin module)

DDR4 DIMM_A2 (64bit, 288-pin module)

DDR4 DIMM_B1 (64bit, 288-pin module)

DDR4 DIMM_B2 (64bit, 288-pin module)

DIGI+

VRM

CHA_FAN2

CPU_FAN CPU_OPT

CHA_FAN1

LPT

COM_DEBUG

RGB_HEADER ADD GEN 2_1

PANEL

AAFP COM

SPDIF_OUT CLRTC

TPM SATA6G

_34

SATA6G_1 SATA6G_2

128Mb

BIOS

ATX_12V

ATX_PWR

U32G1_E12

U32G1_34

U32_E3

LAN_USB_E12

M.2(WIFI)

HDMI1

_DP

HDMI2

BATTERY

KBMS

_USB

_E34

Ethernet

Super

I/O

M.2_1(SOCKET3)

M.2_2(SOCKET3)

2280 2260 2242

AURA

228022602242

PCIEX16(G3)_2

PCIEX16(G3)_1

PCIEX16(G4)

USB_7E5

USB_10

USB_56

24.4cm(9.6in)

Intel®

B660

M.2_2(SOCKET3)

PCIE SATA Optane Memory

4.0 X4 X V

M.2_1(SOCKET3)

PCIE SATA

4.0 X4 X

Audio

CODEC

ADD GEN 2_3

ADD GEN 2_2

LGA1700

AUDIO

U32G2_12

1017 12915 1416 18

5 1 2

7 19

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

1.2.1 Layout contents

1. CPU socket

The motherboard comes with a surface mount Intel® Socket LGA1700 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 x16 graphics card, one PCIe x16 (supporting x4 mode)

and one PCIe x16 (supporting x1 mode) network cards, SCSI cards and other cards that

comply with the PCI Express specication.

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.

• If you want to use two or more high-end PCI Express x16 cards, use a PSU with

1000W power or above to ensure the system stability.

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 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)

GND

FAN PWR

FAN IN

FAN PWM

FAN IN

FAN PWR

GND

FAN PWM

FAN IN

FAN PWR

GND

Chapter 1: Product Introduction

1-3

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.

8. USB 3.2 Gen 1 Type-C® Front Panel connector

The USB 3.2 Gen 1 Type-C® connector allows you to connect a USB

3.2 Gen 1 module for an additional USB 3.2 Gen 1 Type-C® port. The

connector provides a data transfer speed of up to 5 Gb/s.

The USB 3.2 Gen 1 Type-C® module is purchased separately.

9. USB 3.2 Gen 1 headers

The USB 3.2 Gen 1 headers allow you to connect a USB 3.2 Gen

1 module for additional USB 3.2 Gen 1 ports. The USB 3.2 Gen 1

headers provide data transfer speeds of up to 5 Gb/s.

The USB 3.2 Gen 1 module is purchased separately.

10. USB 2.0 headers

The USB 2.0 headers allow you to connect a USB module for additional 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.

11. Addressable Gen 2 headers

The Addressable Gen 2 headers allow you to connect individually addressable

RGB WS2812B LED strips or WS2812B based LED strips.

The Addressable Gen 2 headers support WS2812B addressable RGB LED strips (5V/Data/

Ground), with a maximum power rating of 3A (5V), and the addressable headers on this

board can handle a combined maximum of 500 LEDs.

Before you install or remove any component, ensure that the 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.

• Actual lighting and color will vary with LED strip.

• If your LED strip does not light up, check if the addressable RGB LED strip is

connected in the correct orientation, and the 5V connector is aligned with the 5V

header on the motherboard.

• The addressable RGB LED strip will only light up when the system is powered on.

• The addressable RGB LED strip is purchased separately.

SBU2

SBU1

CC1

VBUS

RX1-

RX1+

GND

TX1-

TX1+

VBUS

TX2+

TX2-

GND

RX2+

RX2-

GND

D-

D+

CC2

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

USB+5V

USB_P2-

USB_P2+

GND

ADD_GEN 2

+5V

Data

Ground

PIN 1

PRIME B660M-A WIFI D4

1-4

12. AURA RGB header

The RGB header allows you to connect an RGB LED strip.

The RGB header supports a 5050 RGB multi-color LED strip (12V/G/R/B), with a maximum

power rating of 3A (12V), and no longer than 3m.

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.

• Actual lighting and color will vary with LED strip.

• If your LED strip does not light up, check if the RGB LED extension cable and the

RGB LED strip are connected in the correct orientation, and the 12V connector is

aligned with the 12V header on the motherboard.

• The LED strip will only light up when the system is powered on.

• The LED strip is purchased separately.

13. RTC Battery connector (2-pin BATTERY)

This connector is for the lithium CMOS battery.

14. 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.

15. COM Port header

This header is for a serial (COM) port. Connect the serial port module cable to

this header, then install the module to a slot opening at the back of the system

chassis.

CLRTC

+3V_BAT

GND

PIN 1

VBAT

GND

BATTERY

PIN 1

COM

DCD

TXD

GND

RTS

RXD

DTR

DSR

CTS

Chapter 1: Product Introduction

1-5

16. 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].

17. LPT header

The LPT (Line Printing Terminal) header supports devices such as

a printer. LPT standardizes as IEEE 1284, which is the parallel port

interface on IBM PC-compatible computers.

18. S/PDIF Out header

This header is for an additional Sony/Philips Digital Interface (S/PDIF) port.

Connect the S/PDIF Out module cable to this header, then install the module to

a slot opening at the back of the system chassis.

19. System Panel header

This header supports several chassis-mounted functions.

• System power LED (4-pin PLED)

This 4-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.

• System warning speaker (4-pin SPEAKER)

This 4-pin header is for the chassis-mounted system warning speaker. The speaker

allows you to hear system beeps and warnings.

• ATX power button/soft-off button (2-pin PWRSW)

This header is for the system power button. Pressing the power button turns the

system on or puts the system in sleep or soft-off mode depending on the operating

system settings. Pressing the power switch for more than four seconds while the

system is ON turns the system OFF.

• 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.

AAFP

AGND

SENSE1_RETUR

SENSE2_RETUR

PORT1 L

PORT1 R

PORT2 R

SENSE_SEND

PORT2 L

HD-audio-compliant

pin definition

PIN 1

O_LPT_XSTB#_R

O_LPT_XPD0_R

O_LPT_XPD1_R

O_LPT_XPD2_R

O_LPT_XPD3_R

O_LPT_XPD4_R

O_LPT_XPD5_R

O_LPT_XPD6_R

O_LPT_XPD7_R

O_LPT_ACK#_R

O_LPT_BUSY_R

O_LPT_PE_R

O_LPT_SLCT_R

O_LPT_XAFD#_R

O_LPT_ERROR#_R

O_LPT_XINIT#_R

O_LPT_XSLIN#_R

GND

SPDIF_OUT

+5V

SPDIFOUT

GND

PRIME B660M-A WIFI D4

1-6

1.2.2 Rear panel connectors

677 8

31 2

109

4 5

ACT/LINK

LED

SPEED

LED

Ethernet port

Speed LED

Status Description

OFF 10Mbps connection

ORANGE 100Mbps connection

GREEN 1Gbps connection

Activity Link LED

Status Description

OFF No link

ORANGE Linked

BLINKING Data activity

• Chassis intrusion header (2-pin CHASSIS)

This header is for a chassis-mounted intrusion detection sensor or switch. Connect one

end of the chassis intrusion sensor or switch cable to this header. The chassis intrusion

sensor or switch sends a high-level signal to this connector when a chassis component

is removed or replaced. The signal is then generated as a chassis intrusion event.

20. SPI TPM header

This header supports a Trusted Platform Module (TPM)

system with a Serial Peripheral Interface (SPI), allowing you

to securely store keys, digital certicates, passwords, and

data. A TPM system also helps enhance network security,

protects digital identities, and ensures platform integrity.

The SPI_TPM module is purchased separately.

TPM

PIN 1

VCCSPI

S_PLTRST#

F2_SPI_CS1#_R

+3V_SPI

F_SPI_CS0#_R

T_SPI_MISO

F_SPI_HOLD#_R

S_SPI_TPM_IRQ#

S_SPI_TPM_CS2#

F_BIOS_WP#_R

GND

T_SPI_CLK

T_SPI_MOSI

1. DisplayPort. This port is for a DisplayPort-compatible device.

2. PS/2 Mouse/Keyboard combo port. This port connects to a PS/2 mouse or PS/2

keyboard.

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

Chapter 1: Product Introduction

1-7

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. HDMI® ports. These ports are for a High-Denition Multimedia Interface (HDMI®)

connector, and are HDCP compliant allowing playback of HD DVD, Blu-ray, and other

protected content.

7. USB 2.0 ports. These Universal Serial Bus (USB) ports are for USB 2.0 devices.

8. USB 3.2 Gen 2 (up to 10Gbps) ports. These Universal Serial Bus (USB) ports

connect to USB 3.2 Gen 2 devices.

9. Wi-Fi 6 ports. These ports connect to Wi-Fi antennas.

• Ensure that the ASUS 2x2 dual band Wi-Fi antenna is securely installed to the Wi-Fi

ports.

• Ensure that the antenna is at least 20 cm away from all persons.

10. 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 conguration

A chassis with an HD audio module in the front panel is required to support 7.1-channel

audio output.

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.

PRIME B660M-A WIFI D4

1-8

1.3 Central Processing Unit (CPU)

This motherboard comes with a surface mount Intel® Socket LGA1700 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.

• 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.

Chapter 1: Product Introduction

1-9

PRIME B660M-A WIFI D4

1-10

1.4 System memory

This motherboard comes with four Double Data Rate 4 (DDR4) Dual Inline Memory Module

(DIMM) sockets. The gure illustrates the location of the DDR4 DIMM sockets:

DIMM_B2

DIMM_B1

DIMM_A2

DIMM_A1

Channel Sockets

Channel A DIMM_A1 & DIMM_A2

Channel B DIMM_B1 & DIMM_B2

• 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.

• A DDR4 memory module is notched differently from a DDR, DDR2, or DDR3 module.

DO NOT install a DDR, DDR2, or DDR3 memory module to the DDR4 slot.

• Intel® 12th Gen Processors support 3200/3000/2933/2800/2666/2400/2133 natively.

• 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.

• 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.

• Refer to www.asus.com for the Memory QVL (Qualied Vendors Lists), and data rate

support depends on the CPU types.

Recommended memory congurations

DIMM_B1

DIMM_B2

DIMM_A2

DIMM_B2

DIMM_A1

DIMM_A2

Chapter 1: Product Introduction

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Asus PRIME B660M-A WIFI D4 User manual

Brand: Asus

Model: PRIME B660M-A WIFI D4

Category: Motherboards

Type: User manual

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PRIME B660M-A WIFI D4-CSM

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Asus PRIME B660M-A WIFI D4 User manual

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