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Rectangular ATX motherboard, dark PCB with silver heatsinks and black slots

ASRock

ASRock B850 Pro RS AMD motherboard

SKU CH-0PMF-7QTF7 MPN B850 Pro RS

AM5 ATX board with 14+2+1 power phases, DDR5 to 8000, PCIe 5.0 x16, one Gen5 M.2, two Gen4 M.2, four SATA, Dragon RTL8125BG LAN 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 Pro RS

Show 4 more
  • Supports Ryzen 7000, 8000 and 9000 Series CPUs via AM5 socket
  • 14+2+1 phase power design with 80A Dr.MOS for stable CPU delivery
  • Four DDR5 slots up to 8000 MT/s (OC) with 256 GB maximum capacity
  • PCIe 5.0 x16 graphics slot plus one Blazing M.2 at 128 Gb/s
  • Realtek ALC897 7.1-channel audio with Nahimic enhancement

AM5 Socket B850 Motherboard

The ASRock B850 Pro RS is an ATX motherboard built for AMD Ryzen 7000, 8000 and 9000 series processors. It uses the B850 chipset and delivers a 14+2+1 phase power design with 80A Dr.MOS. Four DDR5 slots support up to 256GB of memory at speeds up to 8000+(OC) with AMD EXPO and Intel XMP 3.0 profiles.

Builders needing PCIe 5.0 graphics and Gen5 M.2

This board suits users who want a single PCIe 5.0 x16 slot for current and future GPUs and a CPU-attached Blazing M.2 socket running at Gen5x4 128 Gb/s. It also provides two chipset Hyper M.2 sockets at Gen4x4 and one Ultra M.2 at Gen3x4. Builders requiring multiple PCIe 5.0 x16 slots or more than four M.2 sockets should look at higher-tier chipsets.

PCIe 5.0 x16 slot runs at Gen5x16 with 9000 and

The primary graphics slot operates at PCIe 5.0 x16 when paired with Ryzen 9000 or 7000 series processors. With Ryzen 8000 Phoenix 1 series it drops to Gen4x8, and with Phoenix 2 series to Gen4x4. This single specification determines whether your chosen CPU can saturate the graphics bandwidth.

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 PRO RS
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 supportSupports RAID 0 and RAID 1 for SATA storage devices
Supports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices
Audio & video
Audio chipRealtek ALC897
Sound channels7.1 Channels
Connectivity
Ethernet controllerDragon RTL8125BG
Maximum network speed2.5 Gbit/s
Ports & slots
PCIe 4.0 x16 slots1 x PCIe 4.0 x16 Slot (PCIE2), supports x4 mode*
Rear panel ports2 x Antenna Mounting Points
1 x HDMI Port
1 x USB 3.2 Gen2 Type-C Port (10 Gb/s)
1 x USB 3.2 Gen1 Type-C Port (DP-alt mode supports DP1.4a)
4 x USB 3.2 Gen1 Type-A Ports
6 x USB 2.0 Ports
1 x RJ-45 LAN Port
1 x BIOS Flashback Button
HD Audio Jacks: Line in / Front Speaker / Microphone
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
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
1 x Screw for M.2 Socket
More details
BIOS256Mb AMI UEFI Legal BIOS with GUI support

Other versions of this model

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Questions about this item

Which DDR5 memory speed and capacity must I already own to use the board's 8000+(OC) EXPO profile?

You need DDR5 modules rated for 8000 MT/s or higher that carry an AMD EXPO profile; the board supports up to 256 GB across four 288-pin slots in dual-channel mode.

If I keep a Ryzen 8000 series CPU, what PCIe 5.0 x16 lane width will the primary graphics slot provide?

With an 8000 series processor the PCIE1 slot runs at Gen4 x8 instead of the full Gen5 x16 available with 7000 or 9000 series chips.

How can I verify the Realtek ALC897 7.1-channel audio is active after installing the board?

Open Windows Sound settings or Realtek Audio Console and confirm 7.1 surround is listed as the default format for the ALC897 device.

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