ASRock B850M-X Socket AM5 AMD B850 Micro-ATX DDR5
ASRock B850M-X Socket AM5 AMD B850 Micro-ATX DDR5, photo 2
ASRock B850M-X Socket AM5 AMD B850 Micro-ATX DDR5, photo 3
ASRock B850M-X Socket AM5 AMD B850 Micro-ATX DDR5, photo 4
ASRock B850M-X Socket AM5 AMD B850 Micro-ATX DDR5, photo 5
ASRock B850M-X Socket AM5 AMD B850 Micro-ATX DDR5, photo 6
ASRock

ASRock B850M-X Socket AM5 AMD B850 Micro-ATX DDR5

SKU HC-154175MPN 90-MXBR10-A0UAYZ

  • AM5
  • B850
  • Micro-ATX

Highlights

  • AMD B850 chipset with Socket AM5 for Ryzen 9000, 8000, and 7000 CPUs
  • Two DIMM slots supporting up to 128 GB DDR5 at 8200 MT/s (OC)
  • One PCIe 5.0 x4 M.2 and one PCIe 4.0 x4 M.2 with heatsinks
  • 2.5 GbE LAN via Realtek RTL8125BG controller
  • Six 4-pin PWM fan headers and VRM heatsinks for cooling
  • USB 3.2 Gen 2 Type-C, three USB 3.2 Gen 1 Type-A, two USB 2.0 ports

Key specs

Socket
AM5
Chipset
B850
Form factor
Micro-ATX
Memory
DDR5
Wi-Fi
No
Motherboard Chipset
AMD B850
All specifications
$129.99
  • ≈ 0.001702 BTC
  • ≈ 0.05739 ETH
  • ≈ 130.15 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
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Overview

A Micro-ATX motherboard built on the AMD B850 chipset for Socket AM5 processors. It fits compact builds while delivering PCIe 5.0 storage and high-speed DDR5 support.

Board Layout and Power

The Micro-ATX form factor uses a black PCB. An 8-pin CPU power connector feeds the VRM, which is covered by a heatsink to handle high-end Ryzen processors. Two reinforced PCIe 4.0 x16 slots run at x16 and x4 electrical, plus a single PCIe 4.0 x1 slot.

Memory and Storage

Two DDR5 DIMM slots accept up to 128 GB total with AMD EXPO and Intel XMP profiles up to 8200 MT/s. Storage includes one PCIe 5.0 x4 M.2 slot and one PCIe 4.0 x4 M.2 slot, both with dedicated heatsinks, alongside four SATA 6 Gbps ports.

Connectivity and I/O

Rear I/O provides one USB 3.2 Gen 2 Type-C, three USB 3.2 Gen 1 Type-A, and two USB 2.0 Type-A ports. Video outputs include HDMI and DisplayPort for APU graphics. A single 2.5 GbE RJ45 port handles wired networking. Internal headers add one USB 3.2 Gen 1 Type-C, two USB 3.2 Gen 1 Type-A, and four USB 2.0 ports.

Firmware and Extras

The UEFI BIOS supports CPU and memory overclocking with a BIOS Flashback button for recovery. Onboard audio uses the Realtek ALC897 codec. RGB headers allow synchronization with addressable and standard LED strips.

B850M-X Socket AM5 AMD B850 Micro-ATX DDR5 specifications

General
BrandASRock
Manufacturer part no.90-MXBR10-A0UAYZ
EAN4711581490109
Form Factor
Motherboard Form FactorMicro-ATX
CPU
CPU ManufacturerAMD
CPU SocketAM5
Motherboard
Motherboard ChipsetAMD B850
Memory
Max. Memory128 GB
Memory TypeDDR5
Memory Form FactorDIMM
Max. Memory Speed (OC)8200 MT/s
ECC SupportYes
Memory slots2x
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 Supply1x 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
USB 3.0 (internal) Header1
USB 3.0 (internal) Possible Ports2
USB 2.0 (internal) Header2
USB 2.0 (internal) Possible Ports4
Front Panel Audio HeaderYes
SPI TPM HeaderYes
External Ports
USB 3.0 (external) Type C1
USB 3.0 (external) Type A3
USB 2.0 (external) Type A2
Display ConnectorsDisplayPort (1x), HDMI (1x)
Storage Ports
M.2 PCIe 4.0 x41
M.2 PCIe 5.0 x41
SATA 6G (internal)4
Expansion Slots
PCIe x16 slots (total)1
PCIe x4 slots (total)1
PCIe x1 slots (total)1
PCIe 4.0 x16 mechanical slot2
PCIe 4.0 x1 mechanical slot1
Fan Header
4 Pin Fan Connectors6
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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