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Green Micro ATX motherboard with silver heatsinks, four black DDR5 slots, two M.2 shields, and rear I/O panel showing HDMI, USB ports

ASRock

ASRock B850M Challenger WiFi AMD motherboard

SKU CH-9M2C-QM61G MPN B850M Challenger WiFi

Micro ATX board for AM5 Ryzen CPUs with four DDR5 slots up to 8000, dual M.2 including PCIe 5.0 x4, 2.5 Gb LAN, Wi-Fi and Bluetooth

  • CPU socketAM5
  • ChipsetAMD B850
  • Form factorMicro ATX
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryDDR5 8000
  • Max supported RAM256 GB
  • Supports AMD Ryzen 9000, 8000 and 7000 series processors via AM5 socket
  • Four DDR5 slots enable up to 256GB dual-channel memory at 8000 speeds
  • PCIe 5.0 x4 M.2 slot provides high-bandwidth storage for demanding workloads
  • 5Gbps LAN plus Wi-Fi and Bluetooth deliver fast wired and wireless connectivity
  • 8+1+1 Dr.MOS power phases ensure stable voltage delivery for multi-core CPUs

Compact AM5 foundation

The ASRock B850M Challenger WiFi is a Micro ATX board for AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series processors. It targets builders who need a smaller chassis without sacrificing modern connectivity or memory headroom. The B850 chipset delivers current-platform features in a 9.6 by 9.6 inch footprint.

Practical build quality

An 8+1+1 Dr.MOS power phase design feeds the CPU cleanly while four DDR5 slots accept up to 256 GB at 8000 MT/s via EXPO or XMP profiles. Rear I/O supplies six USB 3.2 Gen1 Type-A ports, two USB 2.0 ports, HDMI, 2.5 Gbps LAN, Wi-Fi antenna connectors and a BIOS Flashback button. Two M.2 sockets support PCIe 5.0 x4 and PCIe 4.0 x4 drives, and a Key E slot handles the wireless module.

Upgrade path clarity

Moving from an older AM4 system brings DDR5 bandwidth, PCIe 5.0 graphics and storage lanes, and 2.5 Gbps networking in one step. The jump is worthwhile when a compact workstation or gaming rig needs newer Ryzen cores and faster memory without the cost of a full ATX board. ECC un-buffered support adds stability for long compute tasks.

How it compares

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

Price $104.99
Cheaper than about 75% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameASRock
Processor
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryDDR5 8000
Max supported RAM256 GB
Memory channelsDual Channel
Memory profilesIntel XMP / AMD EXPO
ECC supportYes
BufferingUn-buffered
Storage
M.2 slots2 x M.2 (Support PCIe 5.0 x4 & PCIe 4.0 x4)
Graphics
Onboard video chipAMD RDNA
Audio & video
Audio chipRealtek ALC897
Sound channels7.1 Channels
Connectivity
Ethernet controllerRealtek RTL8125BG
Maximum network speed2.5 Gbit/s
Bluetooth supportYes
Ports & slots
Additional slots1 x M.2 Socket (Key E)
Rear panel ports2 x Antenna Ports, 1 x HDMI, 6 x USB 3.2 Gen1 Type-A, 2 x USB 2.0, 1 x RJ-45 LAN, 1 x BIOS Flashback Button, 3 x Audio Jacks
HDMI ports1 x HDMI
Audio jacks3 Ports
Onboard USB headers1 x USB 3.2 Gen1 Type-C header + 1 x USB 3.2 Gen1 header + 2 x USB 2.0 headers
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight1.27 kg
Package size295 × 262 × 61 mm
More details
LightingRGB

Questions about this item

What PCIe generation does the primary M.2 slot on the ASRock B850M Challenger WiFi support, and what bandwidth does that cap?

The primary M.2 slot supports PCIe 5.0 x4, capping sequential throughput at the Gen5 x4 limit.

What clearance does the Micro ATX form factor and 9.6" x 9.6" dimensions require from the case?

A case with Micro ATX mounting holes and at least 9.6 inches of board depth and width clearance.

How is the AMD EXPO memory profile enabled on this board, and which step is often missed?

Enter the BIOS, load the EXPO profile for the installed DDR5 kit, save changes, and reboot — the save step is frequently skipped.

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