ASRock B850 Pro-A Motherboard Socket AM5 AMD B850 ATX DDR5
ASRock B850 Pro-A Motherboard Socket AM5 AMD B850 ATX DDR5, photo 2
ASRock B850 Pro-A Motherboard Socket AM5 AMD B850 ATX DDR5, photo 3
ASRock B850 Pro-A Motherboard Socket AM5 AMD B850 ATX DDR5, photo 4
ASRock B850 Pro-A Motherboard Socket AM5 AMD B850 ATX DDR5, photo 5
ASRock

ASRock B850 Pro-A Motherboard Socket AM5 AMD B850 ATX DDR5

SKU HC-909514MPN 90-MXBQM0-A0UAYZ

  • AM5
  • B850
  • ATX

Highlights

  • AMD AM5 socket for Ryzen 9000, 8000, 7000 CPUs
  • PCIe 5.0 x16 graphics slot and PCIe 5.0 M.2
  • Four DDR5 DIMM slots up to 256 GB at 8000 MT/s OC
  • Four M.2 slots (one PCIe 5.0, two PCIe 4.0, one PCIe 3.0)
  • 2.5 GbE LAN with Realtek RTL8125BG controller
  • USB 3.2 Gen 2x2 Type-C at 20 Gbps on rear panel

Key specs

Socket
AM5
Chipset
B850
Form factor
ATX
Memory
DDR5
Wi-Fi
No
Motherboard Chipset
AMD B850
All specifications
$119.99
  • ≈ 0.001555 BTC
  • ≈ 0.0524 ETH
  • ≈ 120.11 USDT

In stock Ships by Tue, Nov 10 when paid today.

  • Delivery to the United States: $39.90 DHL Express Worldwide · arrives Wed, Nov 11 – Mon, Nov 16 if paid today
  • Rate locked at checkout Up to 60 min to send BTC, 30 min for ETH and USDT
  • New, sealed and genuine Full manufacturer warranty
  • 30-day returns Unused items in original packaging
Pay with BTCETHUSDTTRC20USDTERC20

Overview

ATX motherboard built on the AMD B850 chipset for Ryzen 9000, 8000, and 7000 processors. Supports PCIe 5.0 graphics and storage, high-speed DDR5, and extensive I/O.

Design and Power Delivery

The board uses a black ATX layout with heatsinks on the VRM and M.2 slots. Dual 8-pin CPU power connectors supply stable current for overclocked high-end processors.

Performance and Memory

Four DIMM slots accept up to 256 GB of DDR5. Overclocked speeds reach 8000 MT/s with AMD EXPO and Intel XMP profiles. PCIe 5.0 links the primary x16 slot and one M.2 for maximum GPU and SSD throughput.

Storage and Connectivity

Four M.2 sockets cover PCIe 5.0, 4.0, and 3.0 x4 modes alongside four SATA 6 Gbps ports. Rear I/O includes HDMI, DisplayPort over USB-C, 2.5 GbE LAN, one USB 20 Gbps Type-C, one USB 5 Gbps Type-C, four USB 5 Gbps Type-A, and six USB 2.0 Type-A ports.

Cooling and Extras

Seven 4-pin PWM fan headers provide flexible cooling control. Internal headers include one USB 20 Gbps Type-C, one USB 5 Gbps Type-C, one USB 5 Gbps Type-A, two USB 2.0 headers, RGB and addressable RGB connectors, front-panel audio, and SPI TPM. BIOS Flashback allows firmware updates without a CPU installed.

B850 Pro-A Motherboard Socket AM5 AMD B850 ATX DDR5 specifications

General
BrandASRock
Manufacturer part no.90-MXBQM0-A0UAYZ
EAN4711581490185
Form Factor
Motherboard Form FactorATX
CPU
CPU ManufacturerAMD
CPU SocketAM5
Motherboard
Motherboard ChipsetAMD B850
Memory
Max. Memory256 GB
Memory TypeDDR5
Memory Form FactorDIMM
Max. Memory Speed (OC)8000 MT/s
ECC SupportYes
Memory slots4x
Performance ProfileAMD EXPO, Intel XMP
Wi-Fi & LAN
LANYes
LAN Ports1x 2.5 Gbit/s
LAN ChipDragon RTL8125BG
Wi-Fi / BluetoothNo
Cooling
M.2 HeatsinksYes
VRM HeatsinksYes
Internal Ports
CPU Power Supply2x 8-Pin
USB 3.0 / 3.1 / 3.2 (internal) Type C Header1
USB 3.0 / 3.1 / 3.2 (internal) Type C Possible Ports1
Internal Ports (continued)
USB 3.0 (internal) Header1
USB 3.0 (internal) Possible Ports2
USB 2.0 (internal) Header2
USB 2.0 (internal) Possible Ports3
RGB / LED connectors1x RGB (4-Pin 5050 12VGRB), 3x Digital RGB (3-Pin 5VDG)
Front Panel Audio HeaderYes
SPI TPM HeaderYes
External Ports
USB 3.1 (external) Type C1
USB 3.0 (external) Type C1
USB 3.0 (external) Type A4
USB 2.0 (external) Type A6
Display ConnectorsHDMI (1x), USB Type C (Display Port shared) (1x)
Storage Ports
M.2 PCIe 3.0 x41
M.2 PCIe 4.0 x42
M.2 PCIe 5.0 x41
SATA 6G (internal)4
Expansion Slots
PCIe x16 slots (total)1
PCIe x4 slots (total)1
PCIe 5.0 x16 mechanical slot1
PCIe 4.0 x16 mechanical slot1
Fan Header
4 Pin Fan Connectors7
Audio
SoundchipRealtek ALC897
Lighting
Lighting / RGBYes
Color
Primary ColorBlack

Specifications come from the manufacturer and can change without notice. Check the box contents and compatibility before ordering; our team answers questions within one business day.

Shipping & returns

Delivery to the United States: $39.90DHL Express Worldwide · arrives Wed, Nov 11 – Mon, Nov 16 if paid today

Ships from our warehouse in Germany: in stock, it leaves within 1–2 business days, tracked to the door.
ToBusiness daysThis item
GermanyDHL Paket1–2$5.90
Other EU countriesDHL Parcel International2–8$11.90–$15.90
UK, Switzerland and NorwayDHL Parcel International3–7$24.90
United States and CanadaDHL Express Worldwide2–5$39.90
Asia and the Middle EastDHL Express Worldwide2–5$49.90
Australia and New ZealandDHL Express Worldwide3–6$59.90
  • Discreet packaging Plain, unbranded box — no crypto or brand references outside
  • Returns 30 days for unused items in original packaging; faulty items are on us
Rates and delivery times by country

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