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ASUS PRIME B850M-A
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ASUS PRIME B850M-A

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Compatibility Data

SocketAM5
ChipsetAMD B850 Chipset
Memory TypeDDR5
M2 Slots6
Form FactormATX
Model: 31175

Technical Specifications23 specs

General

Model
PRIME B850M-A
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Cpu
AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors
Chipset
AMD B850 Chipset
Memory
  • 4 x DIMM slots, max. 256GB, DDR5 Supports up to 8000+MT/s (OC) with Ryzen™ 9000 & 8000 & 7000 Series Processors, ECC and Non-ECC Un-buffered DIMM
  • Dual channel memory architecture
  • Supports AMD Extended Profiles for Overclocking (EXPO™)
  • ASUS Enhanced Memory Profile (AEMP)
  • * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
Graphics
  • 2 x DisplayPort
  • 1 x HDMI™ port
  • * Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications.
  • ** Supports max. 8K@30Hz as specified in DisplayPort 1.4.
  • *** Supports 4K@60Hz as specified in HDMI 2.1.
Expansion Slots
  • AMD Ryzen™ 9000 & 7000 Series Desktop Processors
  • 1 x PCIe 5.0 x16 slot (supports x16 mode)
  • AMD Ryzen™ 8000 Series Desktop Processors
  • 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)
  • AMD B850 Chipset
  • 1 x PCIe 4.0 x16 slot (supports x1 mode)
  • * Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/ 1037507/).
  • ** Specifications vary by CPU types.
Storage
  • Supports 3 x M.2 slots and 4 x SATA 6Gb/s ports
  • AMD Ryzen™ 9000 & 7000 Series Desktop Processors
  • M.2_1 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode)
  • M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
  • AMD Ryzen™ 8000 Series Desktop Processors
  • M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
  • M.2_2 slot (Key M), type 2280 (supports PCIe 4.0 x4/x2 mode)
  • AMD B850 Chipset
  • M.2_3 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
  • 4 x SATA 6Gb/s ports
  • * Specifications vary by CPU types.
  • AMD RAIDXpert2 Technology
  • Ryzen™ 9000 Series Processors: RAID 0/1/5/10
  • Ryzen™ 8000 Series Processors: RAID 0/1
  • Ryzen™ 7000 Series Processors: RAID 0/1/10
Ethernet
  • 1 x Realtek 2.5Gb Ethernet
  • ASUS LANGuard
Usb
  • Rear USB (Total 8 ports)
  • 2 x USB 10Gbps ports (2 x Type-A )
  • 2 x USB 5Gbps ports (2 x Type-A)
  • 4 x USB 2.0 ports (4 x Type-A)
  • Front USB (Total 7 ports)
  • 1 x USB 5Gbps connector (supports USB Type-C®)
  • 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
  • 2 x USB 2.0 headers support 4 additional USB 2.0 ports
  • * USB Type-C® power delivery output: max. 5V/3A
Audio
  • Realtek 7.1 Surround Sound High Definition Audio CODEC
  • - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
  • - Supports up to 24-Bit/192 kHz playback
  • Audio Features
  • - 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 10Gbps ports (2 x Type-A)
  • 2 x USB 5Gbps ports (2 x Type-A)
  • 4 x USB 2.0 ports (4 x Type-A)
  • 2 x DisplayPort
  • 1 x HDMI™ port
  • 1 x Realtek 2.5Gb Ethernet port
  • 3 x Audio jacks
  • 1 x BIOS FlashBack™ button
Internal I O
  • 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 CPU Power connectors
  • 1 x 4-pin +12V CPU Power connectors
  • Storage Related
  • 3 x M.2 slots (Key M)
  • 4 x SATA 6Gb/s ports
  • USB
  • 1 x USB 5Gbps connector (supports USB Type-C® )
  • 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
  • 2 x USB 2.0 headers support 4 additional USB 2.0 ports
  • Miscellaneous
  • 3 x Addressable RGB Gen 2 headers
  • 1 x Clear CMOS header
  • 1 x Chassis Intrusion header
  • 1 x COM Port header
  • 1 x Front Panel Audio header (F_AUDIO)
  • 1 x S/PDIF Out header
  • 1 x SPI TPM header (14-1 pin)
  • 1 x 10-1 pin System Panel header
Special Features
  • ASUS 5X PROTECTION III
  • - DIGI+ VRM
  • - LANGuard
  • - Overvoltage protection
  • - SafeSlot
  • - Stainless-steel back I/O
  • ASUS Q-Design
  • - Q-Dashboard
  • - Q-DIMM
  • - Q-LED Core
  • - Q-Slot
  • ASUS Thermal Solution
  • - M.2 heatsink
  • - VRM heatsink design
  • ASUS EZ DIY
  • - BIOS FlashBack™ button
  • - BIOS FlashBack™ LED
  • - Pre-mounted I/O shield
  • - SafeSlot
  • Aura Sync
  • - Addressable RGB Gen 2 headers
Software Features
  • ASUS Exclusive Software
  • Armoury Crate
  • - Aura Creator
  • - Aura Sync
  • - Fan Xpert 2+
  • ASUS AI Advisor
  • ASUS Driver Hub
  • TurboV Core
  • ASUS CPU-Z
  • Norton 360 Deluxe (60 Days Free Trial)
  • WinRAR (40 Days Free Trial)
  • UEFI BIOS
  • ASUS EZ DIY
  • - ASUS CrashFree BIOS 3
  • - ASUS EZ Flash 3
  • - ASUS UEFI BIOS EZ Mode
  • - ASUS MyHotkey
Bios
256 Mb Flash ROM, UEFI AMI BIOS
Manageability
WOL by PME, PXE
Accessories
  • Cables
  • 2 x SATA 6Gb/s cables
  • Miscellaneous
  • 1 x M.2 rubber package
  • 2 x Screw packages for M.2 SSD
  • Documentation
  • 1 x Quick start guide
Operating System
Windows® 11, Windows® 10 64-bit
Form Factor
  • mATX Form Factor
  • 9.6 inch x 9.6 inch (24.4 cm x 24.4 cm)

Physical Dimensions

Length Mm
243.8
Width Mm
243.8
Height Mm
619.8

Where to Buy

eBay
UK
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