ASRock B850M Steel Legend WiFi 7 - High-Performance AM5 Micro-ATX Motherboard

The ASRock B850M Steel Legend WiFi delivers robust performance for AMD Ryzen 9000, 8000, and 7000 series processors in a compact Micro-ATX form factor. Engineered with a 12+2+1 phase power design featuring Dr.MOS technology, this motherboard provides stable power delivery for demanding workloads and gaming sessions.

Advanced Memory and Storage Configuration

Four DDR5 DIMM slots support dual-channel memory up to 8000+ MHz (OC) with a maximum capacity of 256GB. The board features three M.2 sockets including one Blazing M.2 slot with PCIe Gen5x4 support delivering 128Gbps transfer rates, one Hyper M.2 socket (PCIe Gen4x4), and an additional M.2 socket (PCIe Gen4x2). Multi-layer heatsinks and M.2 bottom heatsink design ensure optimal thermal performance. Four SATA3 ports provide additional storage flexibility with RAID 0, 1, and 10 support.

Expansion and Graphics

The PCIe 5.0 x16 slot with 15µ gold contacts supports the latest graphics cards, while a secondary PCIe 4.0 x4 slot offers additional expansion options. Integrated AMD RDNA graphics output through one HDMI 2.1 port and one DisplayPort 1.4 port, both supporting 4K 120Hz resolution with HDR and HDCP 2.3.

Connectivity and Networking

WiFi 7 802.11be technology with 2x2 antenna configuration delivers extreme wireless speeds across 2.4GHz, 5GHz, and 6GHz frequency bands with 160MHz channel bandwidth. Realtek Dragon 2.5GbE LAN provides wired networking with smart bandwidth control and optimized settings for gaming, browsing, and streaming. Bluetooth 5.4 and MU-MIMO support complete the wireless package.

USB and Audio Features

Comprehensive USB connectivity includes two USB 3.2 Gen2 ports (Type-A and Type-C) on the rear panel delivering 10Gb/s speeds, designated as Lightning Gaming Ports for reduced latency. Additional USB 3.2 Gen1 ports (including one front Type-C) and eight USB 2.0 ports provide extensive peripheral support. Realtek ALC1220 7.1 CH HD audio codec with Nahimic Audio, impedance sensing, and individual PCB layers for left/right channels ensures premium sound quality.

Build Quality and Design

The 2oz copper PCB construction with 20K long-lasting black caps and enlarged heatsink armor ensures durability and thermal efficiency. The flexible integrated I/O shield simplifies installation, while the Lite Release design features an enlarged latch for easy graphics card removal. BIOS Flashback button enables firmware updates without CPU installation. ASRock Auto Driver Installer and Post Status Check simplify setup and troubleshooting.

ASRock B850M Steel Legend WiFi

Key Features
Supports AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series Processors
12+2+1 Phase Power Design, Dr.MOS for VCore+SOC+MISC
4 x DDR5 DIMMs
Supports Dual Channel, up to 8000+ (OC)
1 x PCIe 5.0 x16, 1 x PCIe 4.0 x4
Graphics Output Options: 1 x HDMI, 1 x DisplayPort
Realtek ALC1220 7.1 CH HD Audio Codec, Nahimic Audio
1 x Blazing M.2 (PCIe Gen5x4)
1 x Hyper M.2 (PCIe Gen4x4)
1 x M.2 (PCIe Gen4x2)
4 x SATA3
2 x USB 3.2 Gen2 Type-A+C (Rear)
1 x USB 3.2 Gen1 Type-C (Front)
6 x USB 3.2 Gen1 (2 Rear, 4 Front)
8 x USB 2.0 (4 Rear, 4 Front)
Realtek 2.5G LAN
802.11be WiFi 7 +Bluetooth
Supports M.2 Bottom Heatsink
BIOS Flashback

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

Blazing M.2 (PCIe Gen5x4)
Supports up to 3 x NVMe M.2 SSDs and one of which is able to accommodates the latest PCI Express 5.0 standard.

Lite Release Design
Equipped with an enlarged latch for easy pressing, simplifying both the installation and removal of graphics cards.

Blazing M.2 [PCIe Gen5x4] + Multi-Layer Heatsink
Supports PCIe 5.0 M.2 SSD with a breathtaking 128Gbps transfer rate.

M.2 Bottom Heatsink
Dissipate heat efficiently through the motherboard PCB, maximize performance while maintaining system stability.

Wi-Fi 7 802.11be
Latest WiFi 7 technology delivers extreme wireless internet speeds and low latency.

Specification

Platform
Micro ATX Form Factor: 9.6 in x 9.6-in, 24.4 cm x 24.4 cm
2oz Copper PCB

Unique Feature
Superb 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
ASRock Lightning Gaming Ports
EZ Update
BIOS Flashback Button
ASRock Auto Driver Installer
EZ Troubleshooter
ASRock Post Status Check

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

Chipset
AMD B850

Memory
Dual Channel DDR5 Memory Technology
4 x DDR5 DIMM Slots
Supports DDR5 ECC/non-ECC, un-buffered memory up to 8000+(OC)
Max. capacity of system memory: 256GB
Supports Extreme Memory Profile (XMP) and EXTended Profiles for Overclocking (EXPO) memory modules

Expansion Slot
CPU:
1 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode
1 x PCIe 4.0 x4 Slot (PCIE2), supports x4 mode
Chipset:
1 x Vertical M.2 Socket (Key E), supports type 2230 WiFi/BT PCIe WiFi module
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)

Graphics
Integrated AMD RDNA graphics (Actual support may vary by CPU)
1 x HDMI 2.1 TMDS/FRL 8G Compatible, supports HDR, HDCP 2.3 and max. resolution up to 4K 120Hz
1 x DisplayPort 1.4 with DSC (compressed), supports HDCP 2.3 and max. resolution up to 4K 120Hz

Audio
7.1 CH HD Audio with Content Protection (Realtek ALC1220 Audio Codec)
Impedance Sensing on Rear Out port
Individual PCB Layers for R/L Audio Channel
Nahimic Audio

LAN
2.5 Gigabit LAN 10/100/1000/2500 Mb/s
Dragon RTL8125BG
Supports Dragon 2.5G LAN Software
Smart Auto Adjust Bandwidth Control
Visual User Friendly UI
Visual Network Usage Statistics
Optimized Default Setting for Game, Browser, and Streaming Modes
User Customized Priority Control

Wireless LAN
802.11be 2x2 Wi-Fi 7 Module
Supports IEEE 802.11a/b/g/n/ac/ax/axe/be
Supports 2.4GHz/5GHz/6GHz frequency band
Supports 160MHz channel bandwidth with 6GHz frequency band
The Wi-Fi 7 module is supported by Microsoft Windows 11 only. There is no driver available for Windows 10. The availability of the 6GHz band will depend on the different regulation status of each country and region. It will be activated (for supported countries) through Windows Update and software updates once available.
1 x antenna to support x 2 (Transmit) x 2 (Receive) diversity technology
Supports Bluetooth 5.4
Supports MU-MIMO

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 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.

Storage
CPU:
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
4 x SATA3 6.0 Gb/s Connectors
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, Gen4x4 with 8000 (Phoenix 1) series processors and Gen4x2 with 8000 (Phoenix 2) series processors.

RAID
Supports 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

Connector
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)
3 x Chassis Fan Connectors (4-pin) (Smart Fan Speed Control)
1 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)
1 x Front Panel Audio Connector
2 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
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.

BIOS Feature
256Mb AMI UEFI Legal BIOS with GUI support

Software and UEFI
Software
ASRock Motherboard Utility (A-Tuning)
ASRock Dragon 2.5G LAN Software
ASRock Polychrome SYNC
UEFI
ASRock EZ Mode
ASRock Full HD UEFI
ASRock Auto Driver Installer
ASRock Instant Flash

OS
Microsoft Windows 10 64-bit / 11 64-bit

Certifications
FCC, CE
ErP/EuP ready (ErP/EuP ready power supply is required)

Accessories
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

• Socket: AM5
• CPU Compatibility: AMD Ryzen 9000/8000/7000
• Chipset: AMD B850
• Form Factor: Micro ATX
• Memory Slots: DDR5 - 4 Slots
• M.2 Compatibility: PCIe 5 / PCIe 4
• USB C: Yes