MotherboardsASRock
Asrock B850M Pro-A (Socket AM5) DDR5 mATX Motherboard
MPN: 90-MXBR80-A0UAYZ
Key specifications
SocketAM5
Form factormATX
ChipsetAMD B850
Memory typeDDR5
M.2 slots3
Max Memory256 GB
Full Specifications107 fields
Additional Information
Model Number
90-MXBR80-A0UAYZ
Gtin
4711581490390
Additional Specifications
Water Cooled
No
Cooling
Passive Heatsinks
Qpi Speed
N/A
Dimensions
244 x 244 mm
Note
-
BIOS
Bios Type
UEFI AMI
Bios Memory Size
256 Mbit
Core Specifications
Edition
B850M Pro-A WiFi
Form Factor
MicroATX
Chipset
AMD B850
Expansion slots
Pci Express X4 Gen 4 X Slots
1
Pci Express X16 Gen 5 X Slots
1
Number Of M 2 M Slots
3
1st M 2 Largest Key Size
2280
1st M 2 Highest Pci Express Generation
5.0
2nd M 2 Largest Key Size
2280
2nd M 2 Highest Pci Express Generation
4.0
3rd M 2 Largest Key Size
2280
3rd M 2 Highest Pci Express Generation
4.0
External Connectivity
Network Interface Type
802.11ax Wi-Fi 6E LAN
Wired 2.5 Gigabit LAN
Network Chip Modules
1 x 802.11ax WiFi 6E + BT5.2
1 x Realtek RTL8125BG
Rear I O Connectors
1 x BIOS Flashback Button
1 x DisplayPort 1.4
1 x Front Speaker Out
1 x HDMI 2.1
1 x Line In
1 x Mic-In
1 x RJ-45
4 x USB 2.0
1 x USB 3.1 Gen2 Type-A
2 x USB 3.2 Gen1 Type-A
1 x USB 3.2 Gen2 Type-C
Features
Motherboard Chipset
AMD B850
Audio Chip
Realtek ALC897
Audio Output Channels
7.1 channels
Product Colour
Black
Component For
PC
Motherboard Form Factor
micro ATX
Motherboard Chipset Family
AMD
Windows Operating Systems Supported
Windows 10 x64, Windows 11 x64
Certification
FCC, CE, ErP/EuP
Graphics
Parallel Processing Technology Support
Not supported
Maximum Resolution
3840 x 2160 pixels
Hdcp
Yes
Graphics Support
Primary Gpu Interface
PCIe 5.0 (x16)
Nvidia Sli Support
N/A
Amd Crossfire Support
N/A
Integrated Graphics
Discrete GPU Required for Graphics Output
On Board Graphics Connectors
DisplayPort 1.4 (DSC)
HDMI 2.1
Internal Connectivity
Expansion Slots
1 x M.2 Key E (Supports Wi-Fi modules)
2 x M.2, 22-80, PCIe Gen4x4
1 x M.2, 22-80, PCIe Gen5x4
1 x PCIe 4.0 x4
1 x PCIe 5.0 x16
4 x SATA 6GB/s
Sata Support
SATA3
Raid Support Via
SATA3 / M.2
Storage Mode Support
RAID 0
RAID 1
RAID 10
Internal I O
1 x 24-pin (Power)
1 x 4-pin (Power)
3 x 4-pin CHA_FAN connector
1 x 4-pin Water Pump Connector
1 x 8-pin (Power)
3 x Addressable Digital RGB Header
2 x CPU Fan Connector
1 x Front Panel Audio Header
1 x Power LED / Speaker Header
1 x RGB Header
1 x TPM (SPI_TPM) header
2 x USB 2.0 Header
1 x USB 3.2 Gen1 Header
1 x USB 3.2 Gen1 Type-C Front Panel Header
Internal I/O
Usb 2 0 Connectors
2
Usb 3 2 Gen 1 3 1 Gen 1 Connectors
3
Number Of Sata Iii Connectors
4
Front Panel Audio Connector
Yes
Atx Power Connector 24 Pin
Yes
Cpu Fan Connector
Yes
Number Of Cpu Fan Connectors
2
Number Of Chassis Fan Connectors
3
Eps Power Connector 8 Pin
Yes
Number Of Eps Power Connectors 8 Pin
1
Tpm Connector
Yes
12v Power Connector
Yes
Rgb Led Pin Header
Yes
Number Of Rgb Led Pin Headers
1
Memory
Supported Memory Types
DDR5-SDRAM
Number Of Memory Slots
4
Memory Slots Type
DIMM
Memory Channels
Dual-channel
Ecc Ompatibility
ECC & Non-ECC
Maximum Internal Memory
256 GB
Unbuffered Memory
Yes
Network
Ethernet Lan
Yes
Ethernet Interface Type
2.5 Gigabit Ethernet
Lan Controller
Dragon RTL8125BG
Wi Fi
No
Packaging content
Cables Included
SATA
Screws Included
Yes
Processor
Processor Manufacturer
AMD
Socket
Socket AM5
Compatible Processor Series
AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
Supported Processor Sockets
Socket AM5
RAM Memory Support
Memory Type
DDR5
Memory Channel
Dual (2)
Memory Type Ecc
ECC/Non-ECC
Memory Type R U
UDIMM (Unbuffered)
Memory Speed Mhz
DDR5 - 8000(OC)
Max Memory Capacity
256GB
Rear panel I/O ports
Usb 2 0 Ports Quantity
4
Usb 3 2 Gen 1 3 1 Gen 1 Type A Ports Quantity
2
Usb 3 2 Gen 2 3 1 Gen 2 Type A Ports Quantity
1
Usb 3 2 Gen 2 3 1 Gen 2 Type C Ports Quantity
1
Ethernet Lan Rj 45 Ports
1
Hdmi Ports Quantity
1
Hdmi Version
2.1
Displayports Quantity
1
Displayport Version
1.4
Headphone Outputs
3
Line In
Yes
Microphone In
Yes
Usb Connector Type
USB Type-A, USB Type-C
Storage controllers
Supported Storage Drive Types
HDD & SSD
Supported Storage Drive Interfaces
PCI Express 4.0, PCI Express 5.0, SATA III
Number Of Storage Drives Supported
7
Raid Support
Yes
Raid Levels
0, 1, 10
Weight & dimensions
Width
244 mm
Depth
244 mm
General
Audio
7.1 Channel HD Audio
Best indexed price
£119.45GBP
Indexed 25 May 2026 — verify at retailer
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