ASRock B850M Steel Legend WiFi AMD AM5 Socket Motherboard, Micro-ATX, 4x DDR5 Slots, 3x M.2 Sockets, Fitted I/O Shield, 2.5GbE LAN, Wi-Fi 7, 1x DisplayPort / 1x HDMI Port

ASRock B850M Steel Legend WiFi Motherboard (AMD B850, AM5, mATX)

The ASRock B850M Steel Legend WiFi is a micro ATX AMD AM5 motherboard designed to deliver powerful performance, robust power delivery, and advanced connectivity for Ryzen-based systems.

Key Features

• CPU Support

• Supports AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series Processors

• Power Design

• 12+2+1 Power Phase Design
• VCore with Dr.MOS design for smoother, neater power delivery to the CPU

• Enlarged heatsink armor

• Memory

• 4 x DDR5 DIMM slots
• Dual Channel DDR5, supports up to 8000+ (OC)
• Supports DDR5 ECC/non-ECC, un-buffered memory
• Max system memory capacity: 256GB

• Supports XMP and EXPO memory profiles

• Graphics & Expansion

• 1 x PCIe 5.0 x16 slot (PCIE1)
• 1 x PCIe 4.0 x4 slot (PCIE2)
• Integrated AMD RDNA graphics (actual support may vary by CPU)
• Graphics outputs:
  • 1 x HDMI 2.1 (TMDS/FRL 8G), up to 4K 120Hz, HDR, HDCP 2.3
  • 1 x DisplayPort 1.4 with DSC, up to 4K 120Hz, HDCP 2.3
• Lite Release Design with enlarged latch for easier graphics card installation/removal
• 15µ Gold contact in VGA PCIe slot (PCIE1)

• 1 x Vertical M.2 (Key E) for type 2230 WiFi/BT PCIe module

• Storage

• Supports up to 3 x NVMe M.2 SSDs
• 1 x Blazing M.2 (PCIe Gen5x4) – supports PCIe 5.0 M.2 SSDs up to 128 Gb/s
• 1 x Hyper M.2 (PCIe Gen4x4)
• 1 x M.2 (PCIe Gen4x2)
• 4 x SATA3 6.0 Gb/s connectors
• Supports NVMe SSDs as boot disks

• M.2 Bottom Heatsink for efficient heat dissipation through the PCB

• Networking

• Realtek 2.5G LAN (Dragon RTL8125BG)
• 802.11be Wi-Fi 7 (2x2) + Bluetooth 5.4

• Supports MU-MIMO

• Audio

• Realtek ALC1220 7.1 CH HD Audio Codec with Content Protection
• Nahimic Audio
• Impedance sensing on rear out port

• Individual PCB layers for R/L audio channels

• Connectivity

• Rear:
  • 1 x USB 3.2 Gen2 Type-C
  • 1 x USB 3.2 Gen2 Type-A
  • 2 x USB 3.2 Gen1 Type-A
  • 4 x USB 2.0
• Front:
  • 1 x USB 3.2 Gen1 Type-C
  • 4 x USB 3.2 Gen1
  • 4 x USB 2.0
• All USB ports with ESD protection

• ASRock Lightning Gaming Ports

• Cooling & RGB

• Supports M.2 bottom heatsink
• 2 x CPU fan connectors (4-pin, smart fan speed control)
• 3 x chassis fan connectors (4-pin, smart fan speed control)
• 1 x RGB LED header
• 3 x Addressable LED headers

• LED strip support up to:

  • 12V/3A, 36W total
  • 5V/3A, 15W total

• Convenience & DIY Features

• Flexible integrated I/O shield
• BIOS Flashback button
• ASRock Auto Driver Installer
• ASRock Post Status Check
• EZ Update

• EZ Troubleshooter

• Durability

• 2oz copper PCB
• 20K long-lasting black caps (high quality conductive polymer capacitors)

Specifications

General

CPU Support

• Supports AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series Processors

Memory

Expansion Slots

• Supports NVMe SSDs as boot disks

Graphics

• Integrated AMD RDNA graphics (actual support may vary by CPU)

Outputs: - 1 x HDMI 2.1 TMDS/FRL 8G - HDR, HDCP 2.3, up to 4K 120Hz - 1 x DisplayPort 1.4 with DSC - HDCP 2.3, up to 4K 120Hz

Audio

LAN

Wireless LAN & Bluetooth

USB

CPU: - 1 x USB 3.2 Gen2 Type-C (rear) - 1 x USB 3.2 Gen2 Type-A (rear) - 1 x USB 3.2 Gen1 Type-A (rear, USB32_2)

Chipset: - 1 x USB 3.2 Gen1 Type-C (front) - 5 x USB 3.2 Gen1 Type-A (1 rear USB32_3, 4 front) - 8 x USB 2.0 (4 rear, 4 front)

All USB ports support ESD protection.

Rear Panel I/O

• 2 x Antenna ports
• 1 x HDMI port
• 1 x DisplayPort 1.4
• 1 x USB 3.2 Gen2 Type-C (10 Gb/s)
• 1 x USB 3.2 Gen2 Type-A (10 Gb/s)
• 2 x USB 3.2 Gen1 Type-A
• 4 x USB 2.0
• 1 x RJ-45 LAN port
• 1 x BIOS Flashback button
• HD Audio jacks: Line in / Front Speaker / Microphone

USB32_2–3 are Lightning Gaming Ports.

Storage

CPU: - 1 x Blazing M.2 (M2_1, Key M), type 2280, PCIe Gen5x4 (128 Gb/s)

Chipset: - 1 x M.2 (M2_2, Key M), type 2260/2280, PCIe Gen4x2 (32 Gb/s) - 1 x Hyper M.2 (M2_3, Key M), type 2260/2280, PCIe Gen4x4 (64 Gb/s) - 4 x SATA3 6.0 Gb/s connectors

Additional details: - M2_1 is first priority for M.2 installation - M2_1 speeds: - Gen5x4 with Ryzen 9000 / 7000 series - Gen4x4 with Ryzen 8000 (Phoenix 1) - Gen4x2 with Ryzen 8000 (Phoenix 2)

RAID

• SATA: RAID 0, 1, 10
• M.2 NVMe: RAID 0, 1, 10 (requires additional M.2 NVMe expansion cards for RAID 10)

Internal Connectors & Headers

• 1 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)
• CPU_FAN1 up to 1A (12W)
• CPU_FAN2 up to 3A (36W), auto-detects 3-pin/4-pin
• 3 x Chassis fan connectors (4-pin, smart fan speed control)
• CHA_FAN1–3 up to 3A (36W), auto-detect 3-pin/4-pin
• 1 x 24-pin ATX power connector (Hi-Density)
• 1 x 8-pin 12V power connector (Hi-Density)
• 1 x 4-pin 12V power connector (Hi-Density)
• 1 x Front panel audio connector
• 2 x USB 2.0 headers (up to 4 ports)
• 2 x USB 3.2 Gen1 headers (up to 4 ports)
• 1 x Front panel USB 3.2 Gen1 Type-C header

BIOS

• 256Mb AMI UEFI Legal BIOS with GUI
• Features:
• ASRock EZ Mode
• ASRock Full HD UEFI
• ASRock Instant Flash
• BIOS Flashback

Software & UEFI Tools

• ASRock Motherboard Utility (A-Tuning)
• ASRock Dragon 2.5G LAN Software
• ASRock Polychrome SYNC
• ASRock Auto Driver Installer

Operating System Support

• Microsoft Windows 10 64-bit
• Microsoft Windows 11 64-bit

(Wi-Fi 7 module driver is available for Windows 11 only.)

Certifications

• FCC
• CE
• ErP/EuP ready (requires ErP/EuP ready power supply)

Accessories (Included)

• 2 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

Unique Feature Highlights

• Superb Productivity
• PCIe Gen5 (graphics and M.2)

• Dual Channel DDR5

• Rock-Solid Durability

• 12+2+1 Power Phase Design with Dr.MOS
• Enlarged heatsink armor

• 20K long-lasting black capacitors

• Ultrafast Connectivity

• 2.5G LAN
• 802.11be Wi-Fi 7 module

• ASRock Lightning Gaming Ports

• Easy Updates & Troubleshooting

• EZ Update
• BIOS Flashback button
• ASRock Auto Driver Installer
• ASRock Post Status Check

• EZ Troubleshooter

• Blazing M.2 & Cooling

• Blazing M.2 (PCIe Gen5x4) with multi-layer heatsink
• M.2 bottom heatsink for improved thermal performance