MSI PRO B660M-A WIFI DDR4 User manual

1
Thank you for purchasing the MSI® motherboard. This User Guide gives
information about board layout, component overview, BIOS setup and software
installation.
Contents
Safety Information........................................................................................................ 3
Specifications................................................................................................................ 4
Special Features........................................................................................................... 8
Back Panel Connectors ............................................................................................... 9
LAN Port LED Status Table .................................................................................... 9
Installing antennas (PRO B660M-A WIFI DDR4).................................................. 10
Overview of Components ........................................................................................... 11
CPU Socket ........................................................................................................... 12
DIMM Slots............................................................................................................ 13
PCI_E1~3: PCIe Expansion Slots.......................................................................... 14
JFP1, JFP2: Front Panel Connectors................................................................... 14
M2_1~2: M.2 Slots (Key M) ................................................................................... 15
SATA5~8: SATA 6Gb/s Connectors....................................................................... 17
JAUD1: Front Audio Connector ............................................................................ 17
CPU_PWR1~2, ATX_PWR1: Power Connectors................................................... 18
CPU_FAN1, PUMP_FAN1, SYS_FAN1~2: Fan Connectors.................................. 19
JCI1: Chassis Intrusion Connector....................................................................... 20
JBAT1: Clear CMOS (Reset BIOS) Jumper........................................................... 20
JUSB4: USB 3.2 Gen 1 5Gbps Type-C Connector................................................. 21
JUSB3: USB 3.2 Gen 1 Connector ........................................................................ 21
JUSB1~2: USB 2.0 Connectors............................................................................. 22
JTPM1: TPM Module Connector........................................................................... 22
JTBT1: Thunderbolt Add-on Card Connector ...................................................... 23
JCOM1: Serial Port Connector ............................................................................. 23
JDASH1: Tuning controller Connector................................................................. 23
JRGB1: RGB LED connector................................................................................. 24
JRAINBOW1~2: Addressable RGB LED connectors ............................................ 24

2
Installing OS, Drivers & MSI Center.......................................................................... 25
UEFI BIOS.................................................................................................................... 26
BIOS Setup............................................................................................................ 27
Resetting BIOS...................................................................................................... 28
Updating BIOS....................................................................................................... 28

3
Safety Information
∙The components included in this package are prone to damage from electrostatic
discharge (ESD). Please adhere to the following instructions to ensure successful
computer assembly.
∙Ensure that all components are securely connected. Loose connections may cause
the computer to not recognize a component or fail to start.
∙Hold the motherboard by the edges to avoid touching sensitive components.
∙It is recommended to wear an electrostatic discharge (ESD) wrist strap when
handling the motherboard to prevent electrostatic damage. If an ESD wrist strap
is not available, discharge yourself of static electricity by touching another metal
object before handling the motherboard.
∙Store the motherboard in an electrostatic shielding container or on an anti-static
pad whenever the motherboard is not installed.
∙Before turning on the computer, ensure that there are no loose screws or metal
components on the motherboard or anywhere within the computer case.
∙Do not boot the computer before installation is completed. This could cause
permanent damage to the components as well as injury to the user.
∙If you need help during any installation step, please consult a certified computer
technician.
∙Always turn off the power supply and unplug the power cord from the power outlet
before installing or removing any computer component.
∙Keep this user guide for future reference.
∙Keep this motherboard away from humidity.
∙Make sure that your electrical outlet provides the same voltage as is indicated on
the PSU, before connecting the PSU to the electrical outlet.
∙Place the power cord such a way that people can not step on it. Do not place
anything over the power cord.
∙All cautions and warnings on the motherboard should be noted.
∙If any of the following situations arises, get the motherboard checked by service
personnel:
• Liquid has penetrated into the computer.
• The motherboard has been exposed to moisture.
• The motherboard does not work well or you can not get it work according to user
guide.
• The motherboard has been dropped and damaged.
• The motherboard has obvious sign of breakage.
∙Do not leave this motherboard in an environment above 60°C (140°F), it may damage
the motherboard.

4
Specifications
CPU
∙Supports 12th Gen Intel® Core™ Processors
∙Processor socket LGA1700
* Please go to www.msi.com to get the newest support status as new processors
are released.
Chipset Intel® B660 Chipset
Memory
∙4x DDR4 memory slots, support up to 128GB*
∙Supports 1R 2133/2666/3200 MHz (by JEDEC & POR)
∙Max overclocking frequency:
• 1DPC 1R Max speed up to 4800+ MHz
• 1DPC 2R Max speed up to 4000+ MHz
• 2DPC 1R Max speed up to 4000+ MHz
• 2DPC 2R Max speed up to 3600+ MHz
∙Supports Dual-Channel mode
∙Supports non-ECC, un-buffered memory
∙Supports Intel® Extreme Memory Profile (XMP)
* Please refer to www.msi.com for more information on compatible memory.
Expansion Slots
∙2x PCIe x16 slots
• PCI_E1 (From CPU)
• Support PCIe 4.0 x16
• PCI_E3 (From B660 chipset)
• Support PCIe 3.0 x4
∙1x PCIe 3.0 x1 slot (Fom B660 chipset)
Onboard Graphics
∙2x HDMI 2.1 with HDR ports, supporting a maximum
resolution of 4K 60Hz*/**
∙2x DisplayPort 1.4 ports with HBR3, supporting a
maximum resolution of 4K 60Hz*/**
* Available only on processors featuring integrated graphics.
** Graphics specifications may vary depending on the CPU installed.
SATA Ports ∙4x SATA 6Gb/s ports (From B660 chipset)
Continued on next column

5
Continued from previous column
M.2 SSD Slots
∙2x M.2 slots (Key M)
• M2_1 slot (From CPU)
• Supports up to PCIe 4.0 x4
• Supports 2242/ 2260/ 2280 storage devices
• M2_2 slot (From B660 chipset)
• Supports up to PCIe 4.0 x4
• Supports up to SATA 6Gb/s
• Supports 2242/ 2260/ 2280 storage devices
• Supports Intel® Optane™ Memory
• Support Intel® Smart Response Technology for Intel
Core™ processors
* SATA8 will be unavailable when installing M.2 SATA SSD in the M2_2 slot.
RAID ∙Supports RAID 0, RAID 1, RAID 5 and RAID 10 for SATA
storage devices
Audio Realtek® ALC897 Codec
∙7.1-Channel High Definition Audio
LAN 1x Realtek® RTL8125BG 2.5Gbps LAN controller
Wi-Fi & Bluetooth®
(PRO B660M-A WIFI
DDR4)
Intel® Wi-Fi 6
∙The Wireless module is pre-installed in the M.2 (Key-E)
slot
∙Supports MU-MIMO TX/RX, 2.4GHz/ 5GHz (160MHz) up to
2.4Gbps
∙Supports 802.11 a/ b/ g/ n/ ac/ ax
∙Supports Bluetooth® 5.2
Power Connectors
∙1x 24-pin ATX main power connector
∙1x 8-pin ATX 12V power connector
∙1x 4-pin ATX 12V power connector
Continued on next column

6
Continued from previous column
Internal USB
Connectors
∙1x USB 3.2 Gen 1 5Gbps Type-C connector (From B660
chipset)
∙1x USB 3.2 Gen 1 5Gbps Type-A connector (From
ASM1074)
• Supports additional 2 USB 3.2 Gen 1 5Gbps ports
∙2x USB 2.0 Type-A connectors (From B660 chipset)
• Supports additional 4 USB 2.0 ports
Fan Connectors
∙1x 4-pin CPU fan connector
∙1x 4-pin water-pump fan connector
∙2x 4-pin system fan connectors
System Connectors
∙1x Front panel audio connector
∙2x System panel connectors
∙1x Chassis Intrusion connector
∙1x TPM module connector
∙1x Tuning Controller connector
∙1x TBT connector (supports RTD3)
∙1x Serial port
Jumpers ∙1x Clear CMOS jumper
LED Features
∙1x 4-pin RGB LED connector
∙2x 3-pin RAINBOW LED connectors
∙4x EZ Debug LED
Back Panel
Connectors
∙1x PS/2 mouse/ keyboard port
∙2x USB 2.0 Type-A ports (From B660 chipset)
∙2x DisplayPort ports
∙2x HDMI ports
∙2x USB 3.2 Gen 1 5Gbps Type-A ports (From B660 chipset)
∙2x USB 3.2 Gen 2 10Gbps Type-A ports (From B660
chipset)
∙1x 2.5G LAN (RJ45) port
∙2x Wi-Fi Antenna connectors (PRO B660M-A WIFI DDR4)
∙3x audio jacks
I/O Controller NUVOTON NCT6687 Controller Chip
Continued on next column

7
Continued from previous column
Hardware Monitor
∙CPU/ System/ Chipset temperature detection
∙CPU/ System/ Pump fan speed detection
∙CPU/ System/ Pump fan speed control
Form Factor ∙Micro-ATX Form Factor
∙9.6 in. x 9.6 in. (24.4 cm x 24.4 cm)
BIOS Features
∙1x 256 Mb flash
∙UEFI AMI BIOS
∙ACPI 6.4, SMBIOS 3.4
∙Multi-language
Software
∙Drivers
∙MSI Center
∙Intel Extreme Tuning Utility
∙CPU-Z MSI GAMING
∙Google Chrome™, Google Toolbar, Google Drive
∙Norton™ Internet Security Solution

8
Special Features
MSI Center Features
• LAN Manager
• Mystic Light
• Ambient Devices
• Frozr AI Cooling
• User Scenario
• True Color
• Live Update
• Hardware Monitoring
• Super Charger
• Speed Up
• Smart Image Finder
• MSI Companion
Audio
• Audio Boost
Network
• 2.5G LAN
• LAN Manager
Cooling
• Extended Heatsink Design
• M.2 Shield Frozr
• 7W/mK MOSFET thermal pad
• Choke thermal pad
• Pump Fan
• Smart Fan Control
LED
• Mystic Light Extension (RAINBOW/
RGB)
• Mystic Light SYNC
• Ambient Devices Support
Performance
∙Lightning Gen 4 (M.2/PCIE)
∙Memory Boost
∙Core Boost
∙Game Boost
∙USB 3.2 Gen 2 10G
∙Front USB Type-C
∙2oz Copper thickened PCB
Protection
∙PCI-E Steel Armor
Experience
∙MSI Center
∙Click BIOS 5
∙EZ M.2 Clip
∙Forzr AI Cooling
∙CPU Cooler Tuning
∙EZ LED Control
∙EZ DEBUG LED
∙App player

9
Back Panel Connectors
16
23
4
Item Description
1 PS/2 Mouse/ Keyboard port
2 DisplayPort ports
3 USB 3.2 Gen 1 5Gbps Type-A ports (From B660 chipset)
4 2.5Gbps LAN ports
5 Wi-Fi Antenna connectors (PRO B660M-A WIFI DDR4)
6 Line-in port
7 Line-out port
8 USB 2.0 Type-A ports (From B660 chipset)
9 HDMI ports
10 USB 3.2 Gen 2 10Gbps Type-A ports (From B660 chipset)
11 Mic-in port
5
7
8910 11
LAN Port LED Status Table
Link/ Activity LED
Status Description
Off No link
Yellow Linked
Blinking Data activity
Speed LED
Status Speed
Off 10 Mbps
Green 100/1000 Mbps
Orange 2.5 Gbps

10
Installing antennas (PRO B660M-A WIFI DDR4)
1. Screw the antennas tight to the antenna connectors as shown below.
2. Orient the antennas.
1
2

11
SATA▼5▲6
JUSB3 JUSB4
ATX_PWR1
JRAINBOW1
PUMP_FAN1
CPU_FAN1
DIMMB2
Processor
Socket
CPU_PWR1
CPU_PWR2
JFP1
JTPM1
JDASH1
JUSB2
JUSB1
JCOM1
JTBT1
SATA8
JRGB1
JAUD1
PCI_E3
PCI_E2
M2_2
PCI_E1
SYS_FAN2
M2_1
DIMMB1
DIMMA2
DIMMA1
Overview of Components
JBAT1 JFP2
JRAINBOW2
SATA7

12
⚠
Important
∙ Always unplug the power cord from the power outlet before installing or removing
the CPU.
∙ Please retain the CPU protective cap after installing the processor. MSI will deal
with Return Merchandise Authorization (RMA) requests if only the motherboard
comes with the protective cap on the CPU socket.
∙ When installing a CPU, always remember to install a CPU heatsink. A CPU heatsink
is necessary to prevent overheating and maintain system stability.
∙ Confirm that the CPU heatsink has formed a tight seal with the CPU before booting
your system.
∙ Overheating can seriously damage the CPU and motherboard. Always make sure the
cooling fans work properly to protect the CPU from overheating. Be sure to apply an
even layer of thermal paste (or thermal tape) between the CPU and the heatsink to
enhance heat dissipation.
∙ Whenever the CPU is not installed, always protect the CPU socket pins by covering
the socket with the plastic cap.
∙ If you purchased a separate CPU and heatsink/ cooler, Please refer to the
documentation in the heatsink/ cooler package for more details about installation.
CPU Socket
Please install the CPU into the CPU socket as shown below.
1
23
4
5
6
7
8
9

13
DIMM Slots
Please install the memory module into the DIMM slot as shown below.
Memory module installation recommendation
⚠
Important
∙ Always insert memory modules in the DIMMA2 slot first.
∙ To ensure system stability for Dual channel mode, memory modules must be of the
same type, number and density.
∙ Some memory modules may operate at a lower frequency than the marked value
when overclocking due to the memory frequency operates dependent on its Serial
Presence Detect (SPD). Go to BIOS and find the DRAM Frequency to set the memory
frequency if you want to operate the memory at the marked or at a higher frequency.
∙ It is recommended to use a more efficient memory cooling system for full DIMMs
installation or overclocking.
∙ The stability and compatibility of installed memory module depend on installed CPU
and devices when overclocking.
∙ Please refer to www.msi.com for more information on compatible memory.
DIMMA2 DIMMA2
DIMMB2
DIMMA1
DIMMA2
DIMMB1
DIMMB2
13
2
2

14
PCI_E1~3: PCIe Expansion Slots
PCI_E1: PCIe 4.0 x16 (From CPU)
PCI_E2: PCIe 3.0 x1 (From B660 chipset)
PCI_E3: PCIe 3.0 x4 (From B660 chipset)
⚠
Important
∙ If you install a large and heavy graphics card, you need to use a tool such as MSI
Graphics Card Bolster to support its weight to prevent deformation of the slot.
∙ For a single PCIe x16 expansion card installation with optimum performance, using
the PCI_E1 slot is recommended.
∙ When adding or removing expansion cards, always turn off the power supply and
unplug the power supply power cable from the power outlet. Read the expansion
card’s documentation to check for any necessary additional hardware or software
changes.
JFP1, JFP2: Front Panel Connectors
The JFP1 connector controls the power on, power reset, and the LEDs on your PC
case/chassis. Power Switch/ Reset Switch headers allow you to connect power button/
reset button. Power LED header connects to LED light on the PC case, and HDD LED
header indicates the activity of the hard disk. The JFP2 connector is for Buzzer and
Speaker. To connect the cables from PC case to the right pins, please refer to the
following images below.
1
2 10
9
Power LED
Reserved
Power Switch
JFP1
Reset SwitchHDD LED
1
JFP2
Buzzer
Speaker
⚠
Important
Please note that Power LED and HDD LED have positive and negative connection,
you need to link up the cable to the corresponding positive and negative port on the
motherboard. Otherwise, LEDs won’t work properly.

15
M2_1~2: M.2 Slots (Key M)
Please install the M.2 solid-state drive (SSD) into the M.2 slot as shown below.
Installing M.2 module
For M2_1 slot
1. Loosen the screws of M.2 SHIELD FROZR heatsink.
2. Remove the M.2 SHIELD FROZR and remove the protective films from the thermal
pads.
2
1
1
M2_1
3. If there is no EZ M.2 Clip installed, please install the supplied EZ M.2 Clip kit in the
M.2 slot according to your SSD length.
4. Insert your M.2 SSD into the M.2 slot at a 30-degree angle.
5. Rotate the EZ M.2 Clip to fix the M.2 SSD.
30º30º
3
4
5

16
6. Put the M.2 SHIELD FROZR heatsink back in place and secure it.
6
6
For M2_2 slot
1. Secure the supplied M.2 standoff according to your M.2 SSD length if need.
2. Insert your M.2 SSD into the M.2 slot at a 30-degree angle.
3. Secure the M.2 SSD in place with the supplied M.2 8.5H screw.
30º30º
3
2
1
8.5H screw
Standoff

17
SATA5~8: SATA 6Gb/s Connectors
These connectors are SATA 6Gb/s interface ports. Each connector can connect to one
SATA device.
⚠
Important
∙ Please do not fold the SATA cable at a 90-degree angle. Data loss may result during
transmission otherwise.
∙ SATA cables have identical plugs on either sides of the cable. However, it is
recommended that the flat connector be connected to the motherboard for space
saving purposes.
∙ SATA8 will be unavailable when installing M.2 SATA SSD in the M2_2 slot.
SATA5
SATA7
SATA8 SATA6
JAUD1: Front Audio Connector
This connector allows you to connect audio jacks on the front panel.
1
2 10
9
Pin Signal Name Pin Signal Name
1 MIC L 2 Ground
3 MIC R 4 NC
5 Head Phone R 6 MIC Detection
7 SENSE_SEND 8 No Pin
9 Head Phone L 10 Head Phone Detection

18
⚠
Important
Make sure that all the power cables are securely connected to a proper ATX power
supply to ensure stable operation of the motherboard.
CPU_PWR1~2, ATX_PWR1: Power Connectors
These connectors allow you to connect an ATX power supply.
CPU_PWR1
Pin Signal Name Pin Signal Name
1 Ground 2 Ground
3 Ground 4 Ground
5 +12V 6 +12V
7 +12V 8 +12V
ATX_PWR1
Pin Signal Name Pin Signal Name
1 +3.3V 2 +3.3V
3 Ground 4 +5V
5 Ground 6 +5V
7 Ground 8 PWR OK
9 5VSB 10 +12V
11 +12V 12 +3.3V
13 +3.3V 14 -12V
15 Ground 16 PS-ON#
17 Ground 18 Ground
19 Ground 20 Res
21 +5V 22 +5V
23 +5V 24 Ground
5
4 1
8
CPU_PWR1
24
131
12
ATX_PWR1
3
2 1
4
CPU_PWR2
CPU_PWR2
Pin Signal Name Pin Signal Name
1 Ground 2 Ground
3 +12V 4 +12V

19
CPU_FAN1, PUMP_FAN1, SYS_FAN1~2: Fan Connectors
Fan connectors can be classified as PWM (Pulse Width Modulation) Mode or DC Mode.
PWM Mode fan connectors provide constant 12V output and adjust fan speed with
speed control signal. DC Mode fan connectors control fan speed by changing voltage.
1
PWM Mode pin definition
Pin Signal Name Pin Signal Name
1 Ground 2 +12V
3 Sense 4 Speed Control Signal
Fan connector specifications
Connector Default fan mode Max. current Max. power
CPU_FAN1 PWM mode 2A 24W
PUMP_FAN1 PWM mode 3A 36W
SYS_FAN1~6 PWM mode 2A 24W
⚠
Important
You can adjust fan speed in BIOS > HARDWARE MONITOR.
1
DC Mode pin definition
Pin Signal Name Pin Signal Name
1 Ground 2 Voltage Control
3 Sense 4 NC

20
JCI1: Chassis Intrusion Connector
This connector allows you to connect the chassis intrusion switch cable.
JBAT1: Clear CMOS (Reset BIOS) Jumper
There is CMOS memory onboard that is external powered from a battery located on
the motherboard to save system configuration data. If you want to clear the system
configuration, set the jumpers to clear the CMOS memory.
Keep Data
(default)
Clear CMOS/
Reset BIOS
Resetting BIOS to default values
1. Power off the computer and unplug the power cord.
2. Use a jumper cap to short JBAT1 for about 5-10 seconds.
3. Remove the jumper cap from JBAT1.
4. Plug the power cord and Power on the computer.
Normal
(default)
Trigger the chassis
intrusion event
Using chassis intrusion detector
1. Connect the JCI1 connector to the chassis intrusion switch/ sensor on the chassis.
2. Close the chassis cover.
3. Go to BIOS > SETTINGS > Security > Chassis Intrusion Configuration.
4. Set Chassis Intrusion to Enabled.
5. Press F10 to save and exit and then press the Enter key to select Yes.
6. Once the chassis cover is opened again, a warning message will be displayed on
screen when the computer is turned on.
Resetting the chassis intrusion warning
1. Go to BIOS > SETTINGS > Security > Chassis Intrusion Configuration.
2. Set Chassis Intrusion to Reset.
3. Press F10 to save and exit and then press the Enter key to select Yes.