MSI PRO B660-A DDR4 Motherboard User Guide

June 4, 2024
1-800-Innovations

MSI PRO B660-A DDR4 Motherboard 35

MSI PRO B660-A DDR4 Motherboard

MSI PRO B660-A DDR4 Motherboard product 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.

Specifications

CPU|

  •  Supports 12th Gen Intel® Core™ Processors, Pentium® Gold and Celeron® 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+ MH
  • 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
  • 3x PCIe x1 slots (From B660 chipset)
  • 1x M.2 slot with E-key for PCIe WiFi module only (M2_3)

Multi-GPU|

  • Supports AMD Cross Fire™ Technology

Onboard Graphics|

  • 1x VGA port, supports a maximum resolution of 2048×1536 60Hz, 1920×1200 60Hz
  • 1x HDMI 2.1 with HDR port, supports a maximum resolution of 4K 60Hz */**
  • 1x DisplayPort 1.4 port, supports 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)*
  • SATA7 will be unavailable when installing M.2 SATA SSD in the M2_2 slot.

---|---
M.2 SSD Slot|

  • 2x M.2 slots (Key M)
  • M2_1 slot (From CPU)
  • Supports PCIe 4.0 x4
  • Supports 2242/ 2260/ 2280/ 22110 storage devices
  • M2_2 slot (From B660 chipset)
  • Supports PCIe 4.0 x4
  • Supports SATA 6Gb/s
  • Supports 2242/ 2260/ 2280 storage devices
  • Support Intel® Optane™ Memor
  • Supports Intel® Smart Response Technology for Intel Core™ processor
  • SATA7 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® 8125BG 2.5Gbps LAN controller

Power Connectors|

  • 1x 24-pin ATX main power connector
  • 1x 8-pin ATX 12V power connector
  • 1x 4-pin ATX 12V power connector

Internal USB Connectors|

  • 1x USB 3.2 Gen 1 5Gbps Type-C port (From B660 chipset)
  • 1x USB 3.2 Gen 1 5Gbps connector (From B660 chipset)
  • Supports additional 2 USB 3.2 Gen 1 5Gbps ports
  • 1x USB 2.0 connector (From USB Hub GL850G)
  • Supports additional 2 USB 2.0 ports

Fan Connectors|

  • 1x 4-pin CPU fan connector
  • 1x 4-pin water-pump fan connector
  • 5x 4-pin system fan connectors

---|---
System Connectors|

  • 1x Front panel audio connector
  • 2x System panel connector
  • 1x Chassis Intrusion connector
  • 1x TPM module connector
  • 1x Tuning controller connector
  • 1x TBT connector (Supports RTD3)

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 keyboard/ mouse combo port
  • 4x USB 2.0 Type-A ports (From B660 chipset)
  • 1x VGA port
  • 1x DisplayPort port
  • 1x HDMI port
  • 1x LAN (RJ45) port
  • 2x USB 3.2 Gen 2 10Gbps Type-A port (From B660 chipset)
  • 1x USB 3.2 Gen 2 10Gbps Type-C port (From B660 chipset)
  • 5x Audio jacks
  • 1x Optical S/PDIF Out connector

I/O Controller| NUVOTON NCT6687-R Controller Chip
Hardware Monitor|

  • CPU core/ System/ Chipset/ MOS/ CPU socket temperature detection
  • CPU/ System/ Pump fan speed detection
  • CPU/ System/ Pump fan speed control

Form Factor|

  • ATX Form Factor
  • 12 in. x 9.6 in. (30.5 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

Back Panel Connectors

MSI PRO B660-A DDR4 Motherboard 01

Item Description
1 PS/2 keyboard/ mouse combo port
2 VGA port
3 DisplayPort port
4 2.5 Gbps LAN port
5 USB 2.0 Type-A ports (From B660 chipset)
6 Audio jacks
7 Optical S/PDIF Out connector
8 USB 3.2 Gen 2 10Gbps Type-C port (From B660 chipset)
9 USB 3.2 Gen 2 10Gbps Type-A ports (From B660 chipset)
10 HDMI port

LAN Port LED Status Table
MSI PRO B660-A DDR4 Motherboard 02 Audio Jacks Connection
Audio jacks to headphone and microphone diagram
MSI PRO B660-A DDR4 Motherboard 03Audio jacks to 7.1-channel speakers diagramMSI PRO B660-A DDR4 Motherboard
04

Overview of Components

MSI PRO B660-A DDR4 Motherboard 04

CPU Socket

Please install the CPU into the CPU socket as shown below.
MSI PRO B660-A DDR4 Motherboard 04 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.

DIMM Slots
Please install the memory module into the DIMM slot as shown below.
MSI PRO B660-A DDR4 Motherboard 04

Important

  • 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.

M2_3: M.2 Slot (Key E)
Please install PCIe Wi-Fi module into M2_3 slot as shown below.
MSI PRO B660-A DDR4 Motherboard 04 PCI_E1~5: PCIe Expansion Slots
MSI PRO B660-A DDR4 Motherboard 04 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.
MSI PRO B660-A DDR4 Motherboard 10 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.
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.
    MSI PRO B660-A DDR4 Motherboard 11

  3. Remove (for 22110 SSD) or move (for 2260/ 2242 SSD) the EZ M.2 Clip according to your SSD length. Skip this step, if you install 2280 SSD.

  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. Skip this step, if you install 22110 SSD.
    MSI PRO B660-A DDR4 Motherboard 11

  6. Put the M.2 SHIELD FROZR heatsink back in place and secure it.MSI PRO B660-A DDR4 Motherboard 11

For M2_2 slot

  1.  Please install the supplied EZ M.2 Clip kit in the M.2 slot according to your SSD length.
  2.  Insert your M.2 SSD into the M.2 slot at a 30-degree angle.
  3.  Rotate the EZ M.2 Clip to fix the M.2 SSD.
    MSI PRO B660-A DDR4 Motherboard 14

SATA5~8: SATA 6Gb/s Connectors
These connectors are SATA 6Gb/s interface ports. Each connector can connect to one SATA device.
MSI PRO B660-A DDR4 Motherboard 14 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.
  •  SATA7 will be unavailable when installing M.2 SATA SSD in the M2_2 slot.

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

CPU_PWR2

Pin Signal Name Pin Signal Name
1 Ground 2 Ground
3 +12V 4 +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

Important
Make sure that all the power cables are securely connected to a proper ATX power supply to ensure stable operation of the motherboard.

JAUD1: Front Audio Connector

This connector allows you to connect audio jacks on the front panel.

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

CPU_FAN1, PUMP_FAN1, SYS_FAN1~5: 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.
PWM Mode pin definition

Pin Signal Name Pin Signal Name
1 Ground 2 +12V
3 Sense 4 Speed Control Signal

DC Mode pin definition

Pin Signal Name Pin Signal Name
1 Ground 2 Voltage Control
3 Sense 4 NC

Fan connector specifications

Connector Default fan mode Max. current Max. power
CPU_FAN1 PWM mode 2A 24W
PUMP_FAN1 PWM mode 3A 36W
SYS_FAN1~5 DC mode 1A 12W

Important
You can adjust fan speed in BIOS > HARDWARE MONITOR.

JCI1: Chassis Intrusion Connector

This connector allows you to connect the chassis intrusion switch cable.

  • 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.

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.
JUSB3: USB 3.2 Gen 1 Type-C Connectors

This connector allows you to connect USB 3.2 Gen 1 5Gbps Type-C connector on the front panel. The connector possess a foolproof design. When you connect the cable, be sure to connect it with the corresponding orientation.
MSI PRO B660-A DDR4 Motherboard 23 JUSB2: USB 3.2 Gen 1 Connector
This connector allows you to connect USB 3.2 Gen 1 5Gbps ports on the front panel.

Pin Signal Name Pin Signal Name
1 Power 2 USB3_RX_DN
3 USB3_RX_DP 4 Ground
5 USB3_TX_C_DN 6 USB3_TX_C_DP
7 Ground 8 USB2.0-
9 USB2.0+ 10 Ground
11 USB2.0+ 12 USB2.0-
13 Ground 14 USB3_TX_C_DP
15 USB3_TX_C_DN 16 Ground
17 USB3_RX_DP 18 USB3_RX_DN
19 Power 20 No Pin

Important
Note that the Power and Ground pins must be connected correctly to avoid possible damage.

JUSB1: USB 2.0 Connector

This connector allows you to connect USB 2.0 ports on the front panel.
Pin| Signal Name| Pin| Signal Name
---|---|---|---
1| VCC| 2| VCC
3| USB0-| 4| USB1-
5| USB0+| 6| USB1+
7| Ground| 8| Ground
9| No Pin| 10| NC

Important

  •  Note that the VCC and Ground pins must be connected correctly to avoid possible damage.
  •  In order to recharge your iPad, iPhone and iPod through USB ports, please install  MSI Center utility.
JTPM1: TPM Module Connector

This connector is for TPM (Trusted Platform Module). Please refer to the TPM security platform manual for more details and usages.

Pin Signal Name Pin Signal Name
1 SPI Power 2 SPI Chip Select
3 Master In Slave Out (SPI Data) 4 Master Out Slave In (SPI Data)
5 Reserved 6 SPI Clock
7 Ground 8 SPI Reset
9 Reserved 10 No Pin
11 Reserved 12 Interrupt Request

JCOM1: Serial Port Connector
This connector allows you to connect the optional serial port with bracket.

Pin Signal Name Pin Signal Name
1 DCD 2 SIN
3 SOUT 4 DTR
5 Ground 6 DSR
7 RTS 8 CTS
9 RI 10 No Pin

JLPT1: Parallel Port Connector
This connector allows you to connect the optional parallel port with bracket.MSI PRO B660-A DDR4 Motherboard 28

Pin Signal Name Pin Signal Name
1 RSTB# 2 AFD#
3 PRND0 4 ERR#
5 PRND1 6 PINIT#
7 PRND2 8 LPT_SLIN#
9 PRND3 10 Ground
11 PRND4 12 Ground
13 PRND5 14 Ground
15 PRND6 16 Ground
17 PRND7 18 Ground
19 ACK# 20 Ground
21 BUSY 22 Ground
23 PE 24 Ground
25 SLCT 26 No Pin

JDASH1: Tuning Controller Connector
This connector is used to connect an optional Tuning Controller module.
MSI PRO B660-A DDR4 Motherboard 29

Pin Signal Name Pin Signal Name
1 No Pin 2 NC
3 MCU_SMB_SCL_M 4 MCU_SMB_SDA_M
5 VCC5 6 Ground

JTBT1: Thunderbolt Add-on Card Connector
This connector allows you to connect the add-on Thunderbolt I/O card.
MSI PRO B660-A DDR4 Motherboard 29

Pin Signal Name Pin Signal Name
1 TBT _ Force _PWR 2 TBT_S0IX_Entry_REQ
3 TBTCIO Plug _Event# 4 TBT_S0IX_Entry_ACK
5 SLP_S3#_TBT 6 TBT PSON Override _N
7 SLP_S5#_TBT 8 No Pin
9 Ground 10 SMBCLK_VSB
11 DG _PE Wake 12 SMBDATA_VSB
13 TBT_RTD3_PWR_EN 14 Ground
15 TBT_ Card _DET_R# 16 PD_IRQ#

EZ Debug LED

These LEDs indicate the status of the motherboard.
CPU – indicates CPU is not detected or fail.
DRAM – indicates DRAM is not detected or fail.
VGA – indicates GPU is not detected or fail.
BOOT – indicates booting device is not detected or fail.
JRGB1: RGB LED connector
The JRGB connector allows you to connect the 5050 RGB LED strips 12V.
Pin| Signal Name| Pin| Signal Name
---|---|---|---
1| +12V| 2| G
3| R| 4| B

Important

  • The JRGB connector supports up to 2 meters continuous 5050 RGB LED strips (12V/G/R/B) with the maximum power rating of 3A (12V).
  • Always turn off the power supply and unplug the power cord from the power outlet before installing or removing the RGB LED strip.
  • Please use MSI’s software to control the extended LED strip.

JRAINBOW1~2: Addressable RGB LED connectors
The JRAINBOW connectors allow you to connect the WS2812B Individually Addressable RGB LED strips 5V.
MSI PRO B660-A DDR4 Motherboard 32

Pin Signal Name Pin Signal Name
1 +5V 2 Data
3 No Pin 4 Ground

CAUTION

Do not connect the wrong type of LED strips. The JRGB connector and the JRAINBOW connector provide different voltages, and connecting the 5V LED strip to the JRGB connector will result in damage to the LED strip.
Important

  •  The JRAINBOW connector supports up to 75 LEDs WS2812B Individually Addressable RGB LED strips (5V/Data/Ground) with the maximum power rating of 3A (5V). In the case of 20% brightness, the connector supports up to 200 LEDs.
  • Always turn off the power supply and unplug the power cord from the power outlet before installing or removing the RGB LED strip.
  • Please use MSI’s software to control the extended LED strip.

Installing OS, Drivers & MSI Center

Please download and update the latest utilities and drivers at www.msi.com

Installing Windows 10/ Windows 11
  1. Power on the computer.
  2.  Insert the Windows 10/ Windows 11 installation disc/ USB into your computer.
  3.  Press the Restart button on the computer case.
  4. Press F11 key during the computer POST (Power-On Self Test) to get into Boot Menu.
  5.  Select the Windows 10/ Windows 11 installation disc/USB from the Boot Menu.
  6. Press any key if screen shows Press any key to boot from CD or DVD… message. If not, please skip this step.
  7.  Follow the instructions on the screen to install Windows 10/ Windows 11.

Installing Drivers

  1.  Start up your computer in Windows 10/ Windows 11.
  2.  Insert MSI® disc/ USB Drive into the optical drive/ USB port.
  3. Click the Select to choose what happens with this disc pop-up notification, then select Run DVDSetup.exe to open the installer. If you turn off the AutoPlay feature from the Windows Control Panel, you can still manually execute the DVDSetup.exe from the root path of the MSI USB Drive.
  4. The installer will find and list all necessary drivers in the Drivers/Software tab.
  5.  Click the Install button in the lower-right corner of the window.
  6.  The drivers installation will then be in progress, after it has finished it will prompt you to restart.
  7. Click OK button to finish.
  8. Restart your computer.
MSI Center

MSI Center is an application that helps you easily optimize game settings and smoothly use content creation softwares. It also allows you to control and synchronize LED light effects on PCs and other MSI products. With MSI Center, you can customize ideal modes, monitor system performance, and adjust fan speed.
MSI Center User Guide
MSI PRO B660-A DDR4 Motherboard 33 If you would like to know more information about MSI Center, please refer to http://download.msi.com/manual/mb/MSICENTER.pdf or scan the QR code to access.
Important
Functions may vary depending on the product you have.

UEFI BIOS

MSI UEFI BIOS is compatible with UEFI (Unified Extensible Firmware Interface) architecture. UEFI has many new functions and advantages that traditional BIOS cannot achieve, and it will completely replace BIOS in the future. The MSI UEFI BIOS uses UEFI as the default boot mode to take full advantage of the new chipset capabilities.
Important
The term BIOS in this user guide refers to UEFI BIOS unless otherwise noted.
UEFI advantages

  • Fast booting – UEFI can directly boot the operating system and save the BIOS self- test process. It can also eliminate the time to switch to CSM mode during POST.
  • Supports for hard drive partitions larger than 2 TB.
  • Supports more than 4 primary partitions with a GUID Partition Table (GPT).
  •  Supports unlimited number of partitions.
  • Supports full capabilities of new devices – new devices may not provide backward compatibility.
  •  Supports secure startup – UEFI can check the validity of the operating system to ensure that no malware tampers with the startup process.

Incompatible UEFI cases

  • 32-bit Windows operating system – this motherboard supports only Windows 10/ Windows 11 64-bit operating system.
  • Older graphics card – the system will detect your graphics card. If you use older graphics cards, it may display a warning message There is no GOP (Graphics Output protocol) support detected in this graphics card.

Important
We recommend that you replace it with a graphics card supporting GOP/UEFI or use CPU with integrated graphics for having normal function.
How to check the BIOS mode?

  1.  Power on your computer.
  2. Press Delete key, when the Press DEL key to enter Setup Menu, F11 to enter Boot Menu message appears on the screen during the boot process.
  3. After entering the BIOS, you can check the BIOS Mode at the top of the screen.

BIOS Mode: UEFI

BIOS Setup

The default settings offer the optimal performance for system stability in normal conditions. You should always keep the default settings to avoid possible system damage or failure booting unless you are familiar with BIOS.
Important

  •  BIOS items are regularly updated for better system performance. The items may be slightly different from the latest BIOS; therefore, the description is for reference only. You could also refer to the HELP information panel for BIOS item description.
  • The BIOS screens, options and settings will vary depending on your system.

Entering BIOS Setup
Press Delete key when the Press DEL key to enter Setup Menu, F11 to enter Boot Menu message appears on the screen during the boot process.
Function key
F1: General Help list
F2: Add/ Remove a favorite item
F3: Enter Favorites menu
F4: Enter CPU Specifications menu
F5: Enter Memory-Z menu
F6: Load optimized defaults
F7: Switch between Advanced mode and EZ mode
F8: Load Overclocking Profile
F9: Save Overclocking Profile
F10: Save Change and Reset*
F12: Take a screenshot and save it to USB flash drive (FAT/ FAT32 format only).
Ctrl+F: Enter Search page

  • When you press F10, a confirmation window appears and it provides the modification information. Select between Yes or No to confirm your choice.

BIOS User Guide
If you’d like to know more instructions on setting up the BIOS, please refer to http://download.msi.com/manual/mb/Intel600BIOS.pdf or scan the QR code to access.
Important
Functions may vary depending on the product you have.
Resetting BIOS
You might need to restore the default BIOS settings to solve certain problems. There are several ways to reset BIOS:

  • Go to BIOS and press F6 to load optimized defaults.
  • Short the Clear CMOS jumper on the motherboard.

Important
Be sure the computer is off before clearing CMOS data. Please refer to the Clear CMOS jumper section for resetting BIOS.
Updating BIOS
Updating BIOS with M-FLASH
Before updating:
Please download the latest BIOS file that matches your motherboard model from MSI website. And then save the BIOS file into the USB flash drive.
Updating BIOS:

  1.  Insert the USB flash drive that contains the update file into the USB port.

  2. Please refer the following methods to enter flash mode.

    •  Reboot and press Ctrl + F5 key during POST and click on Yes to reboot the system.
      Press <Ctrl+F5> to activate M-Flash for BIOS update.

    • Reboot and press Del key during POST to enter BIOS. Click the M-FLASH button and click on Yes to reboot the system.
      MSI PRO B660-A DDR4 Motherboard 35

  3. Select a BIOS file to perform the BIOS update process.

  4. When prompted click on Yes to start recovering BIOS.

  5.  After the flashing process is 100% completed, the system will reboot automatically.

Updating the BIOS with MSI Center
Before updating:

  •  Make sure the LAN driver is already installed and the internet connection is set properly.
  •  Please close all other application software before updating the BIOS.

To update BIOS:

  1.  Install and launch MSI Center and go to Support page.
  2.  Select Live Update and click on Advance button.
  3. Select the BIOS file and click on Install button.
  4. The installation reminder will appear, then click the Install button on it.
  5.  The system will automatically restart to update BIOS.
  6.  After the flashing process is 100% completed, the system will restart automatically.

Regulatory Notices
FCC-B Radio Frequency Interference Statement
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and radiates radio frequency energy, and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  •  Reorient or relocate the receiving antenna.
  •  Increase the separation between the equipment and receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

NOTE

  • The changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
  •  Shield interface cables and AC power cord, if any, must be used in order to comply with the emission limits.

FCC Conditions
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

  •  This device may not cause harmful interference.
  • This device must accept any interference received, including interference that may cause undesired operation.

MSI Computer Corp.
901 Canada Court, City of Industry, CA 91748, USA (626)913-0828 www.msi.com
CE Conformity
Products bearing the CE marking comply with one or more of the following EU Directives as may be applicable:

  • RED 2014/53/EU
  •  Low Voltage Directive 2014/35/EU
  • EMC Directive 2014/30/EU
  • RoHS Directive 2011/65/EU
  •  ErP Directive 2009/125/EC

Compliance with these directives is assessed using applicable European Harmonized Standards. The point of contact for regulatory matters is MSI, MSI- NL Eindhoven 5706 5692 ER Son.
Compliance Statement of Innovation, Science and Economic Development Canada (ISED)
CAN ICES-003(B)/NMB-003(B)
Battery Information
European Union:
Batteries, battery packs, and accumulators should not be disposed of as unsorted household waste. Please use the public collection system to return, recycle, or treat them in compliance with the local regulations.
Taiwan:
For better environmental protection, waste batteries should be collected separately for recycling or special disposal.
California, USA:
The button cell battery may contain perchlorate material and requires special handling when recycled or disposed of in California. For further information please visit:
http://www.dtsc.ca.gov/hazardouswaste/perchlorate/
CAUTION:
There is a risk of explosion, if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer.
Chemical Substances Information
In compliance with chemical substances regulations, such as the EU REACH Regulation (Regulation EC No. 1907/2006 of the European Parliament and the Council), MSI provides the information of chemical substances in products at:
https://csr.msi.com/global/index
Environmental Policy

  •  The product has been designed to enable proper reuse of parts and recycling and should not be thrown away at its end of life.
  • Users should contact the local authorized point of collection for recycling and disposing of their end-of-life products.
  •  Visit the MSI website and locate a nearby distributor for further recycling information.
  • Users may also reach us at gpcontdev@msi.com for information regarding proper Disposal, Take-back, Recycling, and Disassembly of MSI products.

WEEE (Waste Electrical and Electronic Equipment) Statement
To protect the global environment and as an environmentalist, MSI must remind you that…
Under the European Union (“EU”) Directive on Waste Electrical and Electronic Equipment, Directive 2002/96/EC, which takes effect on August 13, 2005, products of “electrical and electronic equipment” cannot be  discarded as municipal wastes anymore, and manufacturers of covered electronic equipment will be obligated to take back such products at the end of their useful life. MSI will comply with the product take back requirements at the end of life of MSI-branded products that are sold into the EU. You can return these products to local collection points.
Copyright and Trademarks Notice
Copyright © Micro-Star Int’l Co., Ltd. All rights reserved. The MSI logo used is a registered trademark of Micro-Star Int’l Co., Ltd. All other marks and names mentioned may be trademarks of their respective owners. No warranty as to accuracy or completeness is expressed or implied. MSI reserves the right to make changes to this document without prior notice.

Technical Support

If a problem arises with your system and no solution can be obtained from the user guide, please contact your place of purchase or local distributor. Alternatively, please try the following help resources for further guidance.

  •  Visit the MSI website for technical guide, BIOS updates, driver updates, and other information: http://www.msi.com
  • Register your product at: http://register.msi.com

Revision History

  •  Version 1.0, 2022/01, First release.
  •  Version 1.1, 2022/05, updated release.

References

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