ASRock B850 Pro-A AMD AM5 Socket Motherboard
ATX
4x DDR5 Slots
4x M.2 Sockets
2.5GbE LAN

ASROCK

ASRock B850 Pro-A AM5 ATX DDR5 Motherboard

SKU: TF-MBASR-B850PA
Barcode: 4711581490185

£150.99 Inc. VAT

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ASRock B850 Pro-A AM5 ATX DDR5 Motherboard

£150.99 Inc. VAT

£150.99 Inc. VAT

The ASRock B850 Pro-A is a desktop motherboard for AM5 processors, with DDR5 memory support. The specifications below distinguish storage sockets, expansion slots and rear connections.

Specifications

Model & Compatibility

Model ASRock B850 Pro-A
Chipset AMD B850
CPU socket AM5
Supported processors Supports AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series Processors
Form factor / dimensions ATX Form Factor: 12.0-in x 9.6-in, 30.5 cm x 24.4 cm

Memory

Memory slots 4 × DDR5 DIMM; dual channel
Maximum capacity 256 GB
Memory data rate Up to DDR5-8000 (OC); depends on the CPU, memory modules, DIMM configuration and BIOS. Check the manufacturer's memory QVL.
Memory profiles AMD EXPO; Intel XMP

Expansion & Storage

Expansion slots CPU:
1 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode
Chipset:
1 x PCIe 4.0 x16 Slot (PCIE2), supports x4 mode
1 x M.2 Socket (Key E), supports type 2230 WiFi/BT PCIe WiFi module
15μ Gold Contact in VGA PCIe Slot (PCIE1)

PCIE1 will run at Gen5x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors.
If M2_3 is occupied, PCIE2 will be disabled.
Supports NVMe SSD as boot disks
Storage connections CPU:
1 x Blazing M.2 Socket (M2_1, Key M), supports type 2280 PCIe Gen5x4 (128 Gb/s) mode
1 x Hyper M.2 Socket (M2_2, Key M), supports type 2280 PCIe Gen4x4 (64 Gb/s) mode
Chipset:
1 x Hyper M.2 Socket (M2_3, Key M), supports type 2230/2242/2260/2280 PCIe Gen4x4 (64 Gb/s) mode
1 x Ultra M.2 Socket (M2_4, Key M), supports type 2280 PCIe Gen3x4 (32 Gb/s) mode
2 x SATA3 6.0 Gb/s Connectors
ASMedia ASM1061:
2 x SATA3 6.0 Gb/s Connectors
Supports NVMe SSD as boot disks
M2_1 is the first priority for M.2 installation.
M2_1 will run at Gen5x4 with 9000 and 7000 series processors and Gen4x4 with 8000 (Phoenix 1 and Phoenix 2) series processors.
M2_2 will run at Gen4x4 with 9000 and 7000 series processors, Gen4x4 with 8000 (Phoenix 1) series processors and Gen4x2 with 8000 (Phoenix 2) series processors.
If M2_3 is occupied, PCIE2 will be disabled.
If SATA3_1 or SATA3_2 is occupied, M2_4 will downgrade to Gen3x2 mode.

Network & Audio

Ethernet 2.5 Gigabit LAN 10/100/1000/2500 Mb/s
Dragon RTL8125BG
Wi-Fi / Bluetooth No onboard wireless module listed by the manufacturer. Any optional Wi-Fi module, antennas and Bluetooth functionality require separate compatible hardware.
Audio 7.1 CH HD Audio (Realtek ALC897 Audio Codec)

Rear Connections

Rear I/O 2 x Antenna Mounting Points
1 x HDMI Port
1 x USB 3.2 Gen2 Type-C Port (10 Gb/s)
1 x USB 3.2 Gen1 Type-C Port (DP-alt mode supports DP1.4a)
4 x USB 3.2 Gen1 Type-A Ports
6 x USB 2.0 Ports
1 x RJ-45 LAN Port
1 x BIOS Flashback Button
HD Audio Jacks: Line in / Front Speaker / Microphone

Internal Connections

Internal USB headers 2 x USB 2.0 Headers (Support 3 USB 2.0 ports)
1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports)
1 x Front Panel Type C USB 3.2 Gen2x2 Header (20 Gb/s)
Power connectors 1 x 24 pin ATX Power Connector
2 x 8 pin 12V Power Connectors (Hi-Density Power Connector)
Fan / pump headers 2 x CPU Fan Connectors (4-pin) (Smart Fan Speed Control)
4 x Chassis Fan Connectors (4-pin) (Smart Fan Speed Control)
1 x AIO Pump Fan Connector (4-pin) (Smart Fan Speed Control)
Lighting headers 1 x Power LED and Speaker Header
1 x RGB LED Header
3 x Addressable LED Headers

Compatibility Notes

CPU and BIOS Check the manufacturer's CPU support list and the minimum BIOS version for your exact processor before ordering. A BIOS update may be required.
Display outputs Motherboard display outputs require a compatible processor with integrated graphics. Their availability and maximum resolution depend on the processor.
Memory and expansion DDR4 and DDR5 are not interchangeable. Overclocked memory speeds are not guaranteed. PCIe lane allocation and storage availability can depend on the CPU and installed devices; check the board manual.
Manufacturer restrictions PCIE1 will run at Gen5x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors.
If M2_3 is occupied, PCIE2 will be disabled.
M2_1 will run at Gen5x4 with 9000 and 7000 series processors and Gen4x4 with 8000 (Phoenix 1 and Phoenix 2) series processors.
M2_2 will run at Gen4x4 with 9000 and 7000 series processors, Gen4x4 with 8000 (Phoenix 1) series processors and Gen4x2 with 8000 (Phoenix 2) series processors.
If M2_3 is occupied, PCIE2 will be disabled.

Package & Identification

Manufacturer-listed accessories 1 x I/O Shield
2 x SATA Data Cables
1 x Screw for M.2 Socket
GTIN / EAN 4711581490185