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Micro-ATX motherboard with silver heatsinks and installed Ryzen CPU

ASUS

ASUS PRIME B850M-A & Ryzen 9 9950X3D AMD motherboard & CPU combo

SKU CH-FZDA-XWF7S

Combines a B850 micro-ATX board with three M.2 slots, 2.5 Gb Ethernet, PCIe 5.0 support and DDR5 8000 MT/s capability with a 16-core Ryzen 9 9950X3D CPU featuring 128 MB L3 cache.

  • CPU socketAM5

Motherboard PRIME B850M-A

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CPU + Ryzen 9 9950X3D

  • 16-core Ryzen 9 9950X3D CPU delivers high multi-threaded throughput
  • 128 MB L3 cache accelerates gaming and data-heavy workloads
  • DDR5 memory support up to 8000 MT/s overclocked for faster bandwidth
  • Three M.2 slots provide up to 128 Gbps total storage throughput
  • Realtek 2.5 Gb Ethernet plus PCIe 5.0 slot enable high-speed connectivity

Ready for AM5 Builds

This bundle pairs an ASUS PRIME B850M-A micro-ATX motherboard with an AMD Ryzen 9 9950X3D processor. The combination targets enthusiasts who want a single validated kit for a new AM5 platform build. It includes the CPU and board together so compatibility is assured out of the box.

16-Core Zen 5 Processor

The Ryzen 9 9950X3D delivers 16 cores built on TSMC 4nm FinFET Granite Ridge architecture. It provides 128 MB of L3 cache and 16 MB of L2 cache for high-throughput workloads. Integrated AMD Radeon graphics supply a display output without a discrete card.

VRM Heatsinks and M.2 Cooling

The board uses an 8+2+1 power module layout on a 6-layer PCB with Digi+ VRM digital control. VRM heatsinks, thermal pads and dedicated M.2 heatsinks manage heat from the 170 W CPU and fast storage. A water-pump header and 4-pin PWM/DC fan connectors allow flexible cooling configurations.

How it compares

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

Price $1,021.99
Pricier than about 89% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model namePRIME B850M-A+R9 9950 × 3D
Processor
CPU socketAM5

Other versions of this model

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Questions about this item

What does the DDR5 8000 MT/s overclock rating mean for my memory choice?

The motherboard can run DDR5 memory at speeds up to 8000 MT/s when overclocked, so you can install high-frequency DDR5 kits and enable the XMP or EXPO profile in the UEFI BIOS to reach that rate.

What does the PCIe 5.0 slot support in practice?

The primary expansion slot is wired for PCIe 5.0, letting a compatible graphics card or add-in card use the full 5.0 bandwidth that the Ryzen 9 9950X3D provides.

What mounting pattern and form factor does the PRIME B850M-A use?

The board follows the micro-ATX form factor and uses the standard four-hole micro-ATX mounting pattern, so it fits any chassis designed for micro-ATX or larger motherboards.

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