ASRock B850M Pro RS AMD AM5 Socket Motherboard, Micro-ATX, 4x DDR5 Slots, 3x M.2 Sockets, Fitted I/O Shield, 2.5GbE LAN, 1x DisplayPort / 1x HDMI Port

ASRock B850M PRO RS Micro ATX Motherboard (AMD B850, AM5)

The ASRock B850M PRO RS is a Micro ATX motherboard designed for AMD Socket AM5 Ryzen 9000, 8000, and 7000 Series processors, delivering a solid balance of performance, connectivity, and durability for modern gaming and productivity builds.

Key Features

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

• AMD B850 chipset

• Power Design

• 8 + 2 + 1 power phase design
• Dr.MOS for VCore + SOC + MISC

• VCore with Dr.MOS design for smoother and neater CPU power delivery

• Memory

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

• Supports XMP and EXPO memory profiles

• Graphics & Display

• Integrated AMD RDNA graphics (support varies by CPU)
• 1 x HDMI 2.1 TMDS/FRL 8G compatible, HDR, HDCP 2.3, up to 4K 120Hz

• 1 x DisplayPort 1.4 with DSC, HDCP 2.3, up to 4K 120Hz

• Expansion & Slots

• 1 x PCIe 5.0 x16 slot (PCIE1), supports x16 mode
• 1 x PCIe 4.0 x4 slot (PCIE2), supports x4 mode
• 1 x M.2 Key E slot (type 2230) for WiFi/BT PCIe wireless module
• PCIE1 behavior:
  • Gen5 x16 with Ryzen 9000 & 7000 series
  • Gen4 x8 with Ryzen 8000 (Phoenix 1)
  • Gen4 x4 with Ryzen 8000 (Phoenix 2)
• 15µ gold contact in VGA PCIe slot (PCIE1)

• If M2_3 is occupied, PCIE2 will be disabled

• Storage

• 1 x Blazing M.2 (M2_1, Key M), PCIe Gen5 x4 (128 Gb/s), type 2280
• 2 x Hyper M.2 (M2_2, M2_3, Key M), PCIe Gen4 x4 (64 Gb/s), type 2280
• 4 x SATA3 6.0 Gb/s connectors
• Supports NVMe SSDs as boot disks
• M2_1 is first priority for M.2 installation
• M2_1:
  • Gen5 x4 with Ryzen 9000 & 7000 series
  • Gen4 x4 with Ryzen 8000 (Phoenix 1 & Phoenix 2)

• M2_3:

  • Gen4 x4 with Ryzen 9000 & 7000 series
  • Gen4 x4 with Ryzen 8000 (Phoenix 1)
  • Gen4 x2 with Ryzen 8000 (Phoenix 2)

• RAID Support

• RAID 0, 1, 10 for SATA storage devices
• RAID 0, 1, 10 for M.2 NVMe storage devices

• Requires additional M.2 NVMe expansion cards for RAID 10

• Audio

• Realtek ALC897 7.1 CH HD Audio Codec

• Nahimic Audio

• Networking

• Realtek Dragon RTL8125BG 2.5G LAN (10/100/1000/2500 Mb/s)

• Dragon 2.5G LAN Software:

  • Smart auto adjust bandwidth control
  • Visual network usage statistics
  • Optimized default settings for game, browser, and streaming modes
  • User-customized priority control

• USB Connectivity

• Rear:
  • 1 x USB 3.2 Gen2 Type-C
  • 1 x USB 3.2 Gen2 Type-A (10 Gb/s)
  • 2 x USB 3.2 Gen1 Type-A
  • 4 x USB 2.0
• Front (via headers):
  • 1 x USB 3.2 Gen1 Type-C
  • 4 x USB 3.2 Gen1 Type-A
  • 4 x USB 2.0

• All USB ports support ESD protection

• Cooling & Heatsinks

• Supports M.2 bottom heatsink

• M.2 bottom heatsink helps dissipate heat through the motherboard PCB to maintain performance and stability

• DIY & Convenience Features

• Pre-installed I/O shield to simplify installation
• BIOS Flashback button
• ASRock EZ Troubleshooter
• ASRock Post Status Checker

• ASRock Auto Driver Installer

• Lighting & Fan Control

• 1 x RGB LED header
• 3 x addressable LED headers
• Supports up to 12V/3A (36W) LED strip
• Supports up to 5V/3A (15W) LED strip
• 2 x CPU fan connectors (4-pin, Smart Fan Speed Control)
  • CPU_FAN1 supports up to 1A (12W)
  • CPU_FAN2 supports up to 3A (36W)
• 3 x chassis fan connectors (4-pin, Smart Fan Speed Control), each up to 3A (36W)

• CPU_FAN2 and CHA_FAN1–3 auto-detect 3-pin or 4-pin fans

• Form Factor

• Micro ATX
• 9.6 in x 9.6 in / 30.5 cm x 24.4 cm

Specifications

Platform & Chipset

CPU

Memory

Expansion Slots

Graphics Output

Storage

*Per vendor specification

RAID

Audio

LAN

USB

Rear Panel I/O

• 2 x Antenna mounting points
• 1 x HDMI port
• 1 x DisplayPort 1.4
• 1 x USB 3.2 Gen2 Type-A port (10 Gb/s)
• 1 x USB 3.2 Gen2 Type-C port
• 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

Internal Connectors & Headers

• 1 x SPI TPM 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
• 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 (support 4 USB 2.0 ports)
• 2 x USB 3.2 Gen1 headers (support 4 USB 3.2 Gen1 ports)
• 1 x Front panel USB 3.2 Gen1 Type-C header

BIOS

• 256Mb AMI UEFI Legal BIOS with GUI support

Software & UEFI

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

Operating System Support

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

Certifications

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

Included Accessories

• 2 x SATA data cables
• 1 x Screw for M.2 socket

Unique & Convenience Features

• Superb productivity with PCIe Gen5 (graphics, M.2) and Dual Channel DDR5
• Rock-solid durability with 8+2+1 power phase and Dr.MOS
• Pre-installed I/O shield for easier assembly
• Ultrafast connectivity with 2.5G LAN and multiple USB 3.2 ports
• EZ Update and troubleshooting:
• BIOS Flashback button
• ASRock Auto Driver Installer
• EZ Troubleshooter
• ASRock Post Status Checker

The ASRock B850M PRO RS is a feature-rich Micro ATX AM5 motherboard tailored for users seeking next-generation PCIe Gen5 storage and graphics support, fast DDR5 memory, 2.5G LAN, and comprehensive connectivity in a compact, builder-friendly design.