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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 Socket TypeAM5
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardDDR5 8000
  • Maximum Memory Supported256GB
  • Channel SupportedDual Channel
  • 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.

Highlights

  • 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

Specifications

BrandASRock
CPU Socket TypeAM5
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardDDR5 8000
Maximum Memory Supported256GB
Channel SupportedDual Channel
Memory Performance ProfileIntel XMP / AMD EXPO
ECC SupportedYes
Buffer SupportedUn-buffered
Other Slots1 x M.2 Socket (Key E)
M.22 x M.2 (Support PCIe 5.0 x4 & PCIe 4.0 x4)
Onboard Video ChipsetAMD RDNA
Audio ChipsetRealtek ALC897
Audio Channels7.1 Channels
LAN ChipsetRealtek RTL8125BG
Max LAN Speed2.5Gbps
BluetoothYes
Back I/O 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
HDMI1 x HDMI
Audio Ports3 Ports
Onboard USB1 x USB 3.2 Gen1 Type-C header + 1 x USB 3.2 Gen1 header + 2 x USB 2.0 headers
Form FactorMicro ATX
LED LightingRGB
Dimensions (W x L)9.6" x 9.6"
Shipping weight1.27 kg
Package size295 × 262 × 61 mm

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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