ASRock B850M Steel Legend Wifi Motherboard Socket AM5 AMD B850 Micro-ATX DDR5
ASRock B850M Steel Legend Wifi Motherboard Socket AM5 AMD B850 Micro-ATX DDR5, photo 2
ASRock B850M Steel Legend Wifi Motherboard Socket AM5 AMD B850 Micro-ATX DDR5, photo 3
ASRock B850M Steel Legend Wifi Motherboard Socket AM5 AMD B850 Micro-ATX DDR5, photo 4
ASRock B850M Steel Legend Wifi Motherboard Socket AM5 AMD B850 Micro-ATX DDR5, photo 5
ASRock B850M Steel Legend Wifi Motherboard Socket AM5 AMD B850 Micro-ATX DDR5, photo 6
ASRock

ASRock B850M Steel Legend Wifi Motherboard Socket AM5 AMD B850 Micro-ATX DDR5

SKU HC-112584MPN 90-MXBS2-A0UAYZ

  • AM5
  • B850
  • Micro-ATX

Highlights

  • B850 chipset, AM5 socket ready for Ryzen 9000, 8000, 7000 CPUs
  • 4 DDR5 slots, 256 GB max, 8000 MT/s OC
  • One PCIe 5.0 x16 slot and one PCIe 4.0 x4 slot
  • Three M.2 sockets: one PCIe 5.0 x4 and two PCIe 4.0 x4
  • Wi-Fi 7, Bluetooth 5.4, plus 2.5 GbE LAN via Realtek RTL8125BG
  • Five 4-pin PWM fan headers, VRM and M.2 heatsinks, white PCB

Key specs

Socket
AM5
Chipset
B850
Form factor
Micro-ATX
Memory
DDR5
Wi-Fi
Yes
Motherboard Chipset
AMD B850
All specifications
$129.99
  • ≈ 0.001685 BTC
  • ≈ 0.05677 ETH
  • ≈ 130.12 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 white Micro-ATX motherboard built on the AMD B850 chipset for Socket AM5 Ryzen 9000, 8000, and 7000 processors. It supports DDR5 memory up to 8000 MT/s and includes Wi-Fi 7 plus Bluetooth 5.4.

Design and Cooling

The board uses a white Micro-ATX PCB with reinforced metal shielding on the primary PCIe slot. VRM and M.2 heatsinks cover critical areas, and a rear I/O backplate is included. Five 4-pin PWM headers provide fan and radiator control.

Performance and Memory

Four DIMM slots accept up to 256 GB of DDR5. Overclocked speeds reach 8000 MT/s with Intel XMP profiles. The 4-pin plus 8-pin CPU power connectors deliver stable current for high-end Ryzen processors during sustained loads.

Storage and Expansion

Three M.2 sockets offer one PCIe 5.0 x4 and two PCIe 4.0 x4 lanes for NVMe SSDs. Four SATA 6 Gbps ports handle additional drives. A single PCIe 5.0 x16 slot and a PCIe 4.0 x4 slot cover graphics and add-in cards.

Connectivity and Included Features

Rear I/O provides one USB 3.1 Type-C, one USB 3.1 Type-A, two USB 3.0 Type-A, and four USB 2.0 Type-A ports. DisplayPort and HDMI outputs support integrated graphics. Wi-Fi 7 and Bluetooth 5.4 are onboard, along with 2.5 GbE LAN. Internal headers include USB 3.1 Type-C, USB 3.0, USB 2.0, RGB and addressable RGB, front audio, and SPI TPM.

B850M Steel Legend Wifi Motherboard Socket AM5 AMD B850 Micro-ATX DDR5 specifications

General
BrandASRock
Manufacturer part no.90-MXBS2-A0UAYZ
EAN4711581490499
Form Factor
Motherboard Form FactorMicro-ATX
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 ProfileIntel XMP
Wi-Fi & LAN
LANYes
LAN Ports1x 2.5 Gbit/s
LAN ChipDragon RTL8125BG
Wi-Fi / BluetoothYes
Wi-Fi StandardWi-Fi 7
Bluetooth Standard5.4
Cooling
BackplateYes
M.2 HeatsinksYes
VRM HeatsinksYes
Internal Ports
CPU Power Supply1x 4-Pin + 1x 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) Header2
USB 3.0 (internal) Possible Ports4
USB 2.0 (internal) Header2
USB 2.0 (internal) Possible Ports4
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 3.1 (external) Type A1
USB 3.0 (external) Type A2
USB 2.0 (external) Type A4
Display ConnectorsDisplayPort (1x), HDMI (1x)
Storage Ports
M.2 PCIe 4.0 x21
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 5.0 x16 mechanical slot1
PCIe 4.0 x4 mechanical slot1
Fan Header
4 Pin Fan Connectors5
Audio
SoundchipRealtek ALC1220
Back Connect
Back ConnectNo
Lighting
Lighting / RGBYes
Color
Primary ColorWhite

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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