Asus TUF Gaming B660-PLUS WIFI D4 User manual

Motherboard
TUF GAMING
B660-PLUS WIFI D4

ii
E18947
First Edition
September 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
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AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO
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Products and corporate names appearing in this manual may or may not be registered trademarks or
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owners’ benet, without intent to infringe.

iii
Contents
Safety information...................................................................................................... iv
About this guide.......................................................................................................... v
Package contents....................................................................................................... vi
TUF GAMING B660-PLUS WIFI D4 specications summary.................................. vi
Chapter 1 Product Introduction
1.1 Before you proceed...................................................................................... 1-1
1.2 Motherboard layout...................................................................................... 1-1
1.3 Central Processing Unit (CPU).................................................................... 1-9
1.4 System memory.......................................................................................... 1-11
1.5 M.2 installation............................................................................................ 1-13
1.6 Wi-Fi antenna installation.......................................................................... 1-18
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

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 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 yers,
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
TUF GAMING B660-PLUS 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)/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**
1 x HDMI®port***
* Graphics specications may vary between CPU types. Please refer to www.
intel.com for any updates.
** Supports 4K@60Hz as specied in DisplayPort 1.4.
***Supports 4K@60Hz as specied in HDMI®2.1.
Expansion Slots
Intel®12th Gen Processors
1 x PCIe 5.0/4.0/3.0 x16 slot
Intel®B660 Chipset*
1 x PCIe 3.0 x16 slot (supports x4 mode)
2 x PCIe 3.0 x1 slots
* 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 TUF GAMING B660-PLUS WIFI D4 motherboard
Cables 2 x SATA 6Gb/s cables
Miscellaneous
1 x ASUS Wi-Fi moving antennas
1 x M.2 Rubber Package
1 x M.2 SSD screw package
1 x TUF Gaming sticker
Application DVD 1 x Support DVD
Documentation 1 x TUF Certication card
1 x User guide
If any of the above items is damaged or missing, contact your retailer.

vii
TUF GAMING B660-PLUS WIFI D4 specications
summary
Storage
Total supports 3 x M.2 slots and 4 x SATA 6Gb/s ports
Intel®12th Gen Processors
M.2_1 slot (Key M), type 2242/2260/2280/22110
- 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 x2 mode)
M.2_3 slot (Key M), type 2242/2260/2280/22110 (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®2.5Gb Ethernet
TUF LANGuard
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)
1 x USB 3.2 Gen 2x2 port (1 x USB Type-C®)
1 x USB 3.2 Gen 2 port (1 x Type-A)
3 x USB 3.2 Gen 1 ports (3 x Type-A)
1 x USB 2.0 port (1 x Type-A)
Front USB (Total 7 ports)
1 x USB 3.2 Gen 2 connector (supports USB Type-C®)
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 Denition Audio CODEC
- Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
- Supports up to 24-Bit/192 kHz playback
Audio Features
- Rear optical S/PDIF out port
- Premium audio capacitors
- Dedicated audio PCB layers
- Audio cover
Back Panel I/O Ports
1 x USB 3.2 Gen 2x2 port (1 x USB Type-C®)
1 x USB 3.2 Gen 2 port (1 x Type-A)
3 x USB 3.2 Gen 1 ports (3 x Type-A)
1 x USB 2.0 port (1 x Type-A)
1 x DisplayPort
1 x HDMI®port
1 x Wi-Fi Module
1 x Intel®2.5Gb Ethernet port
5 x Audio jacks
1 x Optical S/PDIF out port
(continued on the next page)

viii
TUF GAMING B660-PLUS WIFI D4 specications
summary
Internal I/O
Connectors
Fan and Cooling related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
1 x 4-pin AIO Pump header
3 x 4-pin Chassis Fan headers
Power related
1 x 24-pin Main Power connector
1 x 8-pin +12V Power connector
1 x 4-pin +12V Power connector
Storage related
3 x M.2 slots (Key M)
4 x SATA 6Gb/s ports
USB
1 x USB 3.2 Gen 2 connector (supports USB Type-C®)
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
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 20-3 pin System Panel header with Chassis intrude function
1 x Thunderbolt™ header
Special Features
ASUS TUF PROTECTION
- DIGI+ VRM (- Digital power design with DrMOS)
- Enhanced DRAM Overcurrent Protection
- ESD Guards
- TUF LANGuard
- Overvoltage Protection
- SafeSlot
- Stainless-Steel Back I/O
ASUS Q-Design
- M.2 Q-Latch
- Q-DIMM
- Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow
green])
- Q-Slot
ASUS Thermal Solution
- M.2 heatsink
- VRM heatsink design
ASUS EZ DIY
- CPU Socket lever protector
- ProCool
- Pre-mounted I/O shield
- SafeDIMM
(continued on the next page)

ix
TUF GAMING B660-PLUS WIFI D4 specications
summary
Special Features
AURA Sync
- AURA RGB header
- Addressable Gen 2 headers
Software Features
ASUS Exclusive Software
Armoury Crate
- AURA Creator
- AURA Sync
- Fan Xpert 4
- Two-Way AI Noise Cancelation
AI Suite 3
- Performance And Power Saving Utility
TurboV EVO
EPU
DIGI+ VRM
TUF GAMING CPU-Z
DTS Audio Processing
MyASUS
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 128 Mb ROM, UEFI AMI BIOS
Manageability WOL by PME, PXE
Operating System Windows®11 64-bit, Windows®10 64-bit
Form Factor ATX Form Factor
12 inch x 9.6 inch (30.5 cm x 24.4 cm)
• Specications are subject to change without notice. Please
refer to the ASUS website for the latest specications.
• MyASUS offers a variety of support features such as helping
to troubleshoot issues, optimizing product performance,
integrating ASUS software, and recovery drive creation.
Please scan the QR Code for installation guide and FAQ.

x

ASUS TUF GAMING B660-PLUS WIFI D4 1-1
Product Introduction
1
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 layout
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)
LGA1700
AIO_PUMP CHA_FAN1
CPU_FAN
CPU_OPT
COM_DEBUG
M.2_3(SOCKET3) M.2_2(SOCKET3)
M.2_1(SOCKET3)
M.2_1(SOCKET3)
PANEL
AAFP
COM
ATX_12V_1
ATX_PWR
U32G1_E12 U32G2_4
Intel®
B660
Intel
Ethernet
BATTERY
HDMI_DP
AUDIO
M.2(WIFI)
Super
I/O
2280
2260
2242
PCIE SATA
4.0 X4 X
M.2_3(SOCKET3)
PCIE SATA Optane Memory
4.0 X4 V X
M.2_2(SOCKET3)
PCIE SATA
4.0 X2 X
2280
22110
22110
2260 2242 228022602242
PCIEX1(G3)_2
PCIEX1(G3)_1
PCIEX16(G3)
PCIEX16(G5)
USB_56 USB_78
Audio Codec
U2_11
U32G1_10
U32G2X2_C1
LAN_U32G2_3
U32G1_E34
30.5cm(12in)
SATA6G_1 SATA6G_2
SATA6G_3SATA6G_4
128Mb
BIOS
TB_HEADER
ADD_GEN 2_2
ADD_GEN 2_3
ADD_GEN 2_1
RGB_HEADER
ATX_12V_2
DIGI+
VRM
CHA_FAN2 CHA_FAN3
CLRTC
24.4cm(9.6in)
CPU
DRAM
VGA
BOOT
9
8
7
6
18
11
5
17 121415
3
5 214 4
11 167 1310 4
6

1-2 Chapter 1: Product Introduction
1.2.1 Layout contents
1. CPU socket
The motherboard comes with a LGA1700 socket designed for 12th Gen Intel®Core™
processors, 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 two PCIe x16 graphics cards and two PCIe 3.0 x1 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.
Header Max.
Current
Max.
Power Default Speed Shared Control
CPU_FAN 1A 12W Q-Fan Controlled A
CPU_OPT 1A 12W Q-Fan Controlled A
AIO_PUMP 1A 12W Full-Speed -
CHA_FAN1 1A 12W Q-Fan Controlled -
CHA_FAN2 1A 12W Q-Fan Controlled -
CHA_FAN3 1A 12W Q-Fan Controlled -
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.
• For a fully congured system, we recommend that you use a power supply unit
(PSU) that complies with ATX 12V Specication 2.0 (or later version) and provides a
minimum power of 350 W.
• 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.
FAN PWM
FAN IN
FAN PWR
GND
GND
FAN PWR FAN IN FAN PWM
FAN PWM
FAN IN
FAN PWR
GND

ASUS TUF GAMING B660-PLUS WIFI D4 1-3
6. M.2 slots (Key M)
The M.2 slots allow you to install M.2 devices such as M.2 SSD modules.
• M.2_1 slot (Key M), type 2242/2260/2280 /22110 (supports PCIe 4.0 X4)
• M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 X2)
• M.2_3 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 X4)
• To enable Intel®Optane™ Memory (Hybrid Storage device), it must be installed in
PCH-attached slots with Intel®Rapid Storage Technology.
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 2 connector (supports USB Type-C®)
The USB 3.2 Gen 2 header (USB Type-C®) allows you to connect a
USB 3.2 Gen 2 module for an additional USB 3.2 Gen 2 Type-C®port.
The header provides a data transfer speed of up to 10 Gb/s.
9. 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.
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. AURA 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.
SBU2
SBU1
CC1
VBUS
RX1-
RX1+
GND
TX1-
TX1+
VBUS
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+
USB+5V USB_P9- USB_P9+ GND NC
USB+5V
USB_P10-
USB_P10+
GND
PIN 1
ADD_GEN 2
+5V
Data
Ground
PIN 1

1-4 Chapter 1: Product Introduction
• 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.
12. AURA RGB header
The RGB header allows you to connect RGB LED strips.
The RGB headers support 5050 RGB multi-color LED strips (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. 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.
14. 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
COM
PIN 1
DCD
TXD
GND
RTS
RI
RXD
DTR
DSR
CTS

ASUS TUF GAMING B660-PLUS WIFI D4 1-5
15. 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].
16. 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 ashes 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.
• 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.
AAFP
AGND NC SENSE1_RETUR SENSE2_RETUR
PORT1 L
PORT1 R PORT2 R
SENSE_SEND
PORT2 L
HD-audio-compliant
pin definition

1-6 Chapter 1: Product Introduction
17. Thunderbolt™ header
The Thunderbolt™ header allows you to connect an add-on
Thunderbolt™ I/O card that supports Intel®’s Thunderbolt™
Technology, allowing you to connect Thunderbolt™-enabled
devices to form a daisy chain-conguration.
• The add-on Thunderbolt™ I/O card and
Thunderbolt™ cables are purchased separately.
• Please visit the ofcial website of your purchased
Thunderbolt card for more details on compatibility.
18. Q-LEDs
The Q-LEDs check key components (CPU, DRAM, VGA, and booting devices) during the
motherboard booting process. If an error is found, the critical component’s LED stays lit up
until the problem is solved.
The Q-LEDs provide the most probable cause of an error code as a starting point for
troubleshooting. The actual cause may vary from case to case.
PIN 1
FORCE_PWR
CIO_PLUG_EVENT
SLP_S3# SLP_S5#
GND
RTD3_SW
I2C_SCL I2C_SDA I2C_IRQ# RTD3_POWER_EN NC PERST_N WAKE#
TB_HEADER

ASUS TUF GAMING B660-PLUS WIFI D4 1-7
1.2.2 Rear panel connectors
1. DisplayPort. This port is for a DisplayPort-compatible device.
2. USB 2.0 port. This Universal Serial Bus (USB) port is for USB 2.0 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.
Intel®I225-V 2.5Gb Ethernet port LED indications
ACT/LINK
LED
SPEED
LED
LAN port
Speed LED
Status Description
OFF No link
OFF 100 Mbps / 10 Mbps
connection
GREEN 2.5 Gbps connection
ORANGE 1 Gbps connection
Activity Link LED
Status Description
OFF No link
GREEN Linked
BLINKING Data activity
4. Center / Subwoofer port (orange). This port connects the center/subwoofer speakers.
5. Rear Speaker Out port (black). This port connects the rear speakers in a 4 channel,
5.1 channel, or 7.1 channel audio conguration.
6. Line In port (light blue). This port connects the tape, CD, DVD player, or other audio
sources.
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 Universal Serial Bus (USB) ports connect
to USB 3.2 Gen 1 devices.
7 8 1110 12 13 14
431 2 5 6
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1-8 Chapter 1: Product Introduction
9. USB 3.2 Gen 2x2 (up to 20Gbps) port (USB Type-C®). This Universal Serial Bus 3.2
(USB 3.2) port is for USB 3.2 Gen 2x2 Type-C®devices.
10. USB 3.2 Gen 2 (up to 10Gbps) port (teal blue, Type A). This Universal Serial Bus
3.2 (USB 3.2) port is for USB 3.2 Gen 2 devices.
11. Wi-Fi 6 ports. These ports connect to Wi-Fi antennas.
• Ensure that the ASUS Wi-Fi moving antennas are securely installed to the Wi-Fi ports.
• Ensure that the antennas are at least 20cm away from all persons.
12. Optical S/PDIF out port. This port allows you to connect your PC to amplied
speakers, headphones, or Sony/Phillips Digital Interconnect Format (S/PDIF) compliant
devices.
13. Microphone port (pink). This port connects a microphone.
Refer to the audio conguration table below 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
Port Headset
2-channel 4-channel 5.1-channel 7.1-channel
Light Blue Line In Line In Line In Side Speaker Out
Lime Line Out Front Speaker Out Front Speaker Out Front Speaker Out
Pink Mic In Mic In Mic In Mic In
Orange — — Center/Subwoofer Center/Subwoofer
Black — Rear Speaker Out Rear Speaker Out Rear Speaker Out
14. 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.

ASUS TUF GAMING B660-PLUS WIFI D4 1-9
1.3 Central Processing Unit (CPU)
This 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 the 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.
• 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.
• The product warranty does not cover damage to the socket contacts resulting from
incorrect CPU installation/removal, or misplacement/loss/incorrect removal of the PnP
cap.
• The CPU ts in only one correct orientation. DO NOT force the CPU into the socket to
prevent bending the connectors on the socket and damaging the CPU.
Installing the CPU
1
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.
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1-10 Chapter 1: Product Introduction
45
Ensure to remove the CPU
socket lever protector on the
lever latch before locking the
lever latch under the retention
tab. Failure to do so may cause
damages to your system when
installing the cooling system.