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Micro ATX board with grey steel heatsinks and silver accents

ASRock

ASRock B850M Steel Legend WiFi AMD motherboard

SKU CH-MPD0-VHMQ8 MPN B850M Steel Legend WiFi

Micro-ATX AM5 board with 12+2+1 power phases, PCIe 5.0 x16, three M.2 sockets, Dragon RTL8125BG LAN and Wi-Fi

  • CPU Socket TypeAM5
  • CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardUp to 8000+(OC)
  • Maximum Memory Supported256GB

Option B850M Steel Legend WiFi

Struck-through versions exist but are not stocked here.

  • Supports Ryzen 9000, 8000 and 7000 series processors on AM5 socket
  • 12+2+1 phase power design with Dr.MOS for stable CPU delivery
  • Four DDR5 slots up to 8000 MT/s and 256 GB maximum capacity
  • One PCIe 5.0 x16 slot plus three M.2 sockets including Gen5x4
  • Realtek ALC1220 7.1 channel audio with Nahimic enhancement and Dragon RTL8125BG LAN

AM5 Micro ATX Platform

The ASRock B850M Steel Legend WiFi is a Micro ATX motherboard built for AMD Socket AM5. It accepts Ryzen 7000, 8000 and 9000 series processors and delivers a 12+2+1 phase Dr.MOS power design. Four DDR5 slots support up to 256 GB of memory with AMD EXPO and Intel XMP 3.0 profiles.

PCIe 5.0 Graphics And Gen5 M.2

The board provides one PCIe 5.0 x16 slot that runs at Gen5 x16 with 9000 and 7000 series CPUs, dropping to Gen4 x8 or x4 with 8000 series parts. A CPU-attached Blazing M.2 socket operates at PCIe Gen5 x4 (128 Gb/s), while chipset M.2 sockets add Gen4 x4 and Gen4 x2 options alongside four SATA 6 Gb/s ports.

Mainstream Enthusiast Focus

This board suits builders who want strong VRM cooling, high-speed DDR5 and Gen5 storage in a compact form factor. Users needing more than two full-size PCIe slots, additional 10 GbE ports or a larger ATX layout should consider a different chipset or form factor.

Highlights

  • Supports Ryzen 9000, 8000 and 7000 series processors on AM5 socket
  • 12+2+1 phase power design with Dr.MOS for stable CPU delivery
  • Four DDR5 slots up to 8000 MT/s and 256 GB maximum capacity
  • One PCIe 5.0 x16 slot plus three M.2 sockets including Gen5x4
  • Realtek ALC1220 7.1 channel audio with Nahimic enhancement and Dragon RTL8125BG LAN

Specifications

BrandASRock
ModelB850M STEEL LEGEND WIFI
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardUp to 8000+(OC)
Maximum Memory Supported256GB
Channel SupportedDual Channel
Memory Performance ProfileAMD EXPO / Intel XMP 3.0
ECC SupportedYes
Buffer SupportedUn-buffered
PCI Express 5.0 x161 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode*
* 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.
* Supports NVMe SSD as boot disks
- 15µ Gold Contact in VGA PCIe Slot (PCIE1)
PCI Express 4.0 x161 x PCIe 4.0 x4 Slot (PCIE2), supports x4 mode*
Serial ATA (SATA)4 x SATA 6Gb/s
M.2CPU:
- 1 x Blazing M.2 Socket (M2_1, Key M), supports type 2280 PCIe Gen5x4 (128 Gb/s) mode*
Chipset:
- 1 x M.2 Socket (M2_2, Key M), supports type 2260/2280 PCIe Gen4x2 (32 Gb/s) mode*
- 1 x Hyper M.2 Socket (M2_3, Key M), supports type 2260/2280 PCIe Gen4x4 (64 Gb/s) mode*
* 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.
SATA RAIDSupports RAID 0, RAID 1 and RAID 10 for SATA storage devices
Supports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices*
* Requires additional M.2 NVMe expansion cards to support RAID 10
Audio ChipsetRealtek ALC1220
Audio Channels7.1 Channels
LAN ChipsetDragon RTL8125BG
Max LAN Speed2.5Gbps
Wireless LANWi-Fi 802.11 be
BluetoothBluetooth 5.4
Back I/O Ports2 x Antenna Ports
1 x HDMI Port
1 x DisplayPort 1.4
1 x USB 3.2 Gen2 Type-C Port (10 Gb/s)
1 x USB 3.2 Gen2 Type-A Port (10 Gb/s)
2 x USB 3.2 Gen1 Ports
4 x USB 2.0 Ports
1 x RJ-45 LAN Port
1 x BIOS Flashback Button
HD Audio Jacks: Line in / Front Speaker / Microphone
* USB32_23 are Lightning Gaming Ports
Onboard USB2 x USB 2.0 Headers (Support 4 USB 2.0 ports)
2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports)
1 x Front Panel Type C USB 3.2 Gen1 Header
Other Connectors1 x SPI TPM Header
1 x Thermistor Cable Header
1 x Power LED and Speaker Header
1 x RGB LED Header*
3 x Addressable LED Headers**
2 x CPU Fan Connectors (4-pin) (Smart Fan Speed Control)***
3 x Chassis Fan Connectors (4-pin) (Smart Fan Speed Control)***
1 x Front Panel Audio Connector
* Supports in total up to 12V/3A, 36W LED Strip
** Support in total up to 5V/3A, 15W LED Strip
*** CPU_FAN1 supports the fan power up to 1A (12W).
*** CPU_FAN2 and CHA_FAN1~3 support the fan power up to 3A (36W).
*** CPU_FAN2 and CHA_FAN1~3 can auto detect if 3-pin or 4-pin fan is in use.
Form FactorMicro ATX
Dimensions (W x L)9.6" x 9.6"
Power Pin1 x 24 pin ATX Power Connector (Hi-Density Power Connector)
1 x 8 pin 12V Power Connector (Hi-Density Power Connector)
1 x 4 pin 12V Power Connector (Hi-Density Power Connector)
BIOS Feature256Mb AMI UEFI Legal BIOS with GUI support
SoftwareSoftware
- ASRock Motherboard Utility (A-Tuning)
- ASRock Dragon 2.5G LAN Software
- ASRock Polychrome SYNC
* These utilities can be downloaded from ASRock Live Update & APP Shop.
UEFI
- ASRock EZ Mode
- ASRock Full HD UEFI
- ASRock Auto Driver Installer
- ASRock Instant Flash
Windows 11Windows OS 10 64-bit / 11 64-bit
FeaturesSuperb Productivity
- PCIe Gen5 (Graphics, M.2)
- Dual Channel DDR5
Rock-Solid Durability
- 12+2+1 Power Phase, Dr.MOS for VCore+SOC+MISC with Enlarged Heatsink
Armor
- Flexible Integrated I/O Shield
- 20K Long-lasting Black Caps (high quality and conductive polymer capacitors)
Ultrafast Connectivity
- 2.5G LAN, 802.11be Wi-Fi 7 Module
EZ Update
- BIOS Flashback Button
- ASRock Auto Driver Installer
EZ Troubleshooter
- ASRock Post Status Checker
Package Contents2 x SATA Data Cables
2 x ASRock WiFi 2.4/5/6 GHz Antennas
1 x Thermistor Cable
2 x Screws for M.2 Sockets
1 x Standoff for M.2 Socket
Shipping weight1.20 kg
Package size305 × 267 × 64 mm

Other versions of this model

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Questions about this item

What case clearance does the Micro ATX form factor of this board require?

The board uses the Micro ATX form factor, so it fits any chassis that supports Micro ATX or larger ATX layouts with standard standoff positions.

Which CPU power connectors must be populated for the 12+2+1 phase VRM to function?

Connect both the 8-pin and 4-pin EPS cables from the power supply; the 4-pin is often missed but is required for full phase operation.

When should the 20K black capacitors on the VRM be inspected or replaced?

The capacitors are rated for 20,000 hours at their maximum temperature; plan a visual check after several years of heavy use and replace if bulging or leaking appears.

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