MotherboardsASRock
Asrock B850 Pro-A (Socket AM5) DDR5 ATX Motherboard
MPN: 90-MXBQM0-A0UAYZ
Key specifications
SocketAM5
Form factorATX
ChipsetAMD B850
Memory typeDDR5
M.2 slots5
Max Memory256 GB
Full Specifications109 fields
Additional Information
Model Number
90-MXBQM0-A0UAYZ
Gtin
4711581490185
Additional Specifications
Water Cooled
No
Cooling
Passive Heatsinks
Qpi Speed
N/A
Dimensions
305 x 244 mm
Note
-
BIOS
Bios Type
UEFI AMI
Bios Memory Size
256 Mbit
Core Specifications
Edition
B850 Pro-A
Form Factor
ATX
Chipset
AMD B850
Expansion slots
Pci Express X16 Gen 4 X Slots
1
Pci Express X16 Gen 5 X Slots
1
Number Of M 2 M Slots
4
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
4th M 2 Largest Key Size
2280
4th M 2 Highest Pci Express Generation
3.0
External Connectivity
Network Interface Type
Wired 2.5 Gigabit LAN
Network Chip Modules
1 x Realtek RTL8125BG
Rear I O Connectors
1 x BIOS Flashback Button
1 x Front Speaker Out
1 x HDMI 2.1
1 x Line In
1 x Mic-In
1 x RJ-45
6 x USB 2.0
4 x USB 3.2 Gen1 Type-A
1 x USB 3.2 Gen1 Type-C / DP
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
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
Requires Processor Graphics or Discrete GPU
On Board Graphics Connectors
HDMI 2.1
USB Type-C (DisplayPort)
Internal Connectivity
Expansion Slots
1 x M.2 Key E (Supports Wi-Fi modules)
1 x M.2, 22-30/42/60/80, PCIe Gen4x4
1 x M.2, 22-80, PCIe Gen3x4
1 x M.2, 22-80, PCIe Gen4x4
1 x M.2, 22-80, PCIe Gen5x4
1 x PCIe 4.0 x16 (x4 Bandwidth)
1 x PCIe 5.0 x16
4 x SATA 6GB/s
Sata Support
SATA3
Raid Support Via
-
Storage Mode Support
RAID 0
RAID 1
RAID 10
Internal I O
1 x 24-pin (Power)
1 x 4-pin AIO Pump Connector
4 x 4-pin CHA_FAN connector
2 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 Gen2x2
Internal I/O
Usb 2 0 Connectors
2
Usb 3 2 Gen 1 3 1 Gen 1 Connectors
1
Usb 3 2 Gen 2x2 Connectors
1
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
4
Eps Power Connector 8 Pin
Yes
Number Of Eps Power Connectors 8 Pin
2
Tpm Connector
Yes
12v Power Connector
Yes
Number Of Water Pump Connectors
1
Rgb Led Pin Header
Yes
Number Of Rgb Led Pin Headers
4
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
6
Usb 3 2 Gen 1 3 1 Gen 1 Type A Ports Quantity
4
Usb 3 2 Gen 1 3 1 Gen 1 Type C 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
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 3.0, PCI Express 4.0, PCI Express 5.0, SATA III
Number Of Storage Drives Supported
8
Raid Support
Yes
Raid Levels
0, 1, 10
Weight & dimensions
Width
305 mm
Depth
244 mm
General
Audio
7.1 Channel HD Audio
Best indexed price
£136.99GBP
Indexed 16 Mar 2026 — verify at retailer
