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ATX motherboard with silver-grey steel heatsinks and black PCB

ASRock

ASRock B850 Steel Legend WiFi AMD motherboard AM5 14+2+1 phase 80A Dr.MOS DDR5 8000+ 256GB

SKU CH-3CH0-C4D4Q MPN B850 Steel Legend WiFi

ATX AM5 board with 14+2+1 phase 80A Dr.MOS, DDR5 up to 8000+ OC and 256GB capacity, PCIe 5.0 x16, one Blazing M.2 Gen5 x4, three Hyper M.2 Gen4 x4, four SATA, Dragon RTL8125BG LAN, Wi-Fi and 7.1 audio

  • ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Form factorATX
  • CPU socketAM5
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryUp to 8000+(OC)

Model B850 Steel Legend WiFi

Show 4 more
  • 14+2+1 phase power with 80A Dr.MOS delivers stable CPU voltage
  • DDR5 up to 8000+ MT/s across four slots supports 256GB capacity
  • PCIe 5.0 x16 slot runs at full speed with Ryzen 9000 and 7000 CPUs
  • Blazing M.2 at Gen5x4 plus three Hyper M.2 at Gen4x4 for fast storage
  • Realtek ALC4082 7.1-channel audio with Nahimic enhancement for clear sound

Built for Ryzen 9000 8000 7000

The ASRock B850 Steel Legend WiFi is an ATX motherboard for AMD Socket AM5. It supports Ryzen 9000 8000 and 7000 series processors with a 14+2+1 phase power design using 80A Dr.MOS. Four DDR5 slots accept up to 256GB at 8000+(OC) with AMD EXPO and Intel XMP 3.0 profiles.

Installation is straightforward for ATX builders

The board fits standard ATX cases and uses a familiar 24-pin plus 8-pin CPU power layout. Four 288-pin DDR5 slots are spaced for most coolers. One PCIe 5.0 x16 slot runs at Gen5x16 with 9000 and 7000 CPUs but drops to Gen4x8 with 8000 Phoenix 1 and Gen4x4 with 8000 Phoenix 2. M.2 shields require screws and the front USB 3.2 Gen2x2 Type-C header needs a matching case port.

Suits mainstream enthusiasts and daily users

This board fits builders who want strong VRM cooling 7.1 audio and WiFi without flagship pricing. Four M.2 slots and four SATA ports cover most storage needs. Users planning heavy multi-GPU setups or needing 10GbE should look at higher-end chipsets. Those building in small form factor cases need a micro-ATX or mini-ITX alternative.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $151.99
Cheaper than about 61% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASRock
Model nameB850 STEEL LEGEND WIFI
Processor
ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryUp to 8000+(OC)
Max supported RAM256 GB
Memory channelsDual Channel
Memory profilesAMD EXPO / Intel XMP 3.0
ECC supportYes
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
SATA and RAID support0/1/10
Audio & video
Audio chipRealtek ALC4082
Sound channels7.1 Channels
Connectivity
Ethernet controllerDragon RTL8125BG
Maximum network speed2.5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
PCIe 4.0 x16 slots1 x PCIe 4.0 x16 Slot (PCIE2), supports x4 mode
Onboard USB headers2 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 Gen2 × 2 Header (20 Gb/s)
Power
Power connectors1 × 24 pin ATX Power Connector (Hi-Density Power Connector)
2 × 8 pin 12 V Power Connectors (Hi-Density Power Connector)
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
Shipping weight1.81 kg
Package size356 × 279 × 76 mm
Compatibility
Windows 11 supportWindows OS 10 64-bit / 11 64-bit
In the box
In the box2 x SATA Data Cables
2 x ASRock WiFi 2.4/5/6 GHz Antennas
1 x Thermistor Cable
More details
BIOS256Mb AMI UEFI Legal BIOS with GUI support

Other versions of this model

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Questions about this item

How can I confirm the 14+2+1 phase 80A Dr.MOS VRM is delivering stable power after I build the system?

Enter the BIOS and watch the VCore and SOC voltage readings under load; low ripple and steady values matching the 20K 1000uF capacitor spec show the power phase is working as intended.

What comes in the box with the B850 Steel Legend WiFi and which essential parts must I buy separately?

The motherboard, I/O shield, SATA cables, M.2 screws and driver disc are included; you must purchase an AM5 Ryzen 7000, 8000 or 9000 series CPU, DDR5 memory modules, storage drives and a PSU separately.

Which memory kit should I choose to reach the 8000+ OC ceiling on the four 288-pin DDR5 slots?

Pick a 2x 16GB or 4x 16GB DDR5 EXPO kit rated at 8000 MT/s or higher; populating all four slots with matched modules lets the dual-channel controller hit the 256GB maximum at the advertised overclock speed.

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