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Micro-ATX motherboard with CPU installed, black PCB, silver heatsinks

ASUS

ASUS PRIME B850M-A WIFI & Ryzen 9 9900X3D AMD motherboard combo

SKU CH-H1ZV-JYSGM

AM5 motherboard and 12-core Ryzen 9 9900X3D combo with DDR5 8000 MT/s support, three M.2 slots, PCIe 5.0, Wi-Fi 6E and 2.5 Gb Ethernet

  • CPU Socket TypeAM5

Motherboard PRIME B850M-A WIFI

Show 3 more configurations

CPU + Ryzen 9 9900X3D

  • Ready-to-build combo with matched Ryzen 9 9900X3D CPU
  • 12-core Zen 5 processor with 128 MB L3 cache for heavy workloads
  • DDR5 memory support up to 8000 MT/s overclocking headroom
  • Three M.2 slots delivering up to 128 Gbps total bandwidth
  • 5 Gb Ethernet plus Wi-Fi 6E for fast wired and wireless networking

Combo Build Ready

The ASUS PRIME B850M-A WIFI motherboard paired with the Ryzen 9 9900X3D processor forms a complete AM5 platform foundation. It targets builders who want a matched CPU and board without separate compatibility checks. The micro-ATX form factor suits compact or standard chassis layouts.

DDR5 Headroom and Storage Lanes

The board supports DDR5 memory up to 8000 MT/s when overclocked, giving high bandwidth for the 12-core CPU with 128 MB L3 cache and 12 MB L2 cache. Three M.2 slots provide up to 128 Gbps total throughput for fast storage expansion. The 120 W processor and 8+2+1 power modules with a 6-layer PCB deliver stable current for sustained workloads.

Connectivity and Cooling Integration

A PCIe 5.0 slot readies the build for next-generation graphics or add-in cards. Realtek 2.5 Gb Ethernet and Wi-Fi 6E handle wired and wireless networking. Front-panel USB 5 Gbps Type-C support simplifies case connections. VRM heatsinks, thermal pads, an M.2 heatsink and dedicated pump and fan headers manage thermals. AURA SYNC and a second-generation addressable ARGB header allow lighting coordination.

Highlights

  • Ready-to-build combo with matched Ryzen 9 9900X3D CPU
  • 12-core Zen 5 processor with 128 MB L3 cache for heavy workloads
  • DDR5 memory support up to 8000 MT/s overclocking headroom
  • Three M.2 slots delivering up to 128 Gbps total bandwidth
  • 5 Gb Ethernet plus Wi-Fi 6E for fast wired and wireless networking

Specifications

BrandASUS
ModelPRIME B850M-A WIFI+R9 9900X3D
CPU Socket TypeAM5

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Will the ASUS PRIME B850M-A WIFI work with my existing DDR5 memory kit?

The motherboard supports DDR5 speeds up to 8000 MT/s when overclocked, so your current kit will run at its rated speed or the board's default JEDEC frequency.

How can I confirm the Ryzen 9 9900X3D is boosting correctly after assembly?

Enter the UEFI BIOS to verify the CPU is detected with its 128 MB L3 cache and monitor core clocks under load using the board's built-in hardware monitoring tools.

Does the combo include the CPU cooler or do I need to buy one separately?

The bundle provides the motherboard and Ryzen 9 9900X3D processor only; a compatible AM5 cooler must be purchased separately for the 120 W TDP chip.

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