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Micro-ATX motherboard with CPU cooler installed, dark PCB, silver heatsinks

ASUS

ASUS PRIME B850M-K & Ryzen 9 9950X3D Combo AMD Motherboard

SKU CH-KB8H-NQEZG

A motherboard and CPU combo pairing an AM5 board with a 16-core Ryzen 9 9950X3D processor, 128 MB L3 cache, DDR5 8400 MT/s support, PCIe 5.0, three M.2 slots and 2.5 Gb Ethernet

  • CPU Socket TypeAM5

Motherboard PRIME B850M-K

Struck-through versions exist but are not stocked here.

CPU + Ryzen 9 9950X3D

  • Ready-to-build combo pairs B850M-K motherboard with Ryzen 9 9950X3D CPU
  • 8+2+1 power modules on 6-layer PCB deliver stable VRM performance
  • DDR5 memory support up to 8400 MT/s overclocking for high bandwidth
  • PCIe 5.0 slot plus three M.2 slots provide fast expansion headroom
  • 128 MB L3 cache and AMD Radeon graphics boost gaming and multitasking

ASUS PRIME B850M-K & Ryzen 9 9950X3D Combo

This package pairs an ASUS PRIME B850M-K motherboard with an AMD Ryzen 9 9950X3D processor. The board uses the AM5 socket and supports DDR5 memory up to 8400 MT/s when overclocked. It provides three M.2 slots and a PCIe 5.0 expansion slot. A Realtek 2.5 Gb Ethernet controller handles wired networking.

Suited for high-core-count workloads

The 16-core CPU delivers 128 MB of L3 cache and a 170 W TDP, making it strong for multi-threaded applications and cache-sensitive games. Builders who need integrated graphics can use the on-chip AMD Radeon engine. Users targeting lower power envelopes or smaller form factors should evaluate other options.

Fits an mATX chassis with DDR5 memory and PCIe 5.0

The motherboard requires an AM5-compatible cooler and a power supply able to feed the 8+2+1 VRM design. VRM heatsinks, an M.2 heatsink and four-pin fan headers manage thermals. Rear I/O includes USB 10 Gbps Type-A and a front-panel USB 5 Gbps Type-C header. Aura Sync and addressable ARGB pins allow lighting coordination.

Highlights

  • Ready-to-build combo pairs B850M-K motherboard with Ryzen 9 9950X3D CPU
  • 8+2+1 power modules on 6-layer PCB deliver stable VRM performance
  • DDR5 memory support up to 8400 MT/s overclocking for high bandwidth
  • PCIe 5.0 slot plus three M.2 slots provide fast expansion headroom
  • 128 MB L3 cache and AMD Radeon graphics boost gaming and multitasking

Specifications

BrandASUS
ModelPRIME B850M-K+R9 9950X3D
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

What DDR5 memory speed must I already have to reach the board's 8400 MT/s OC rating?

You need DDR5 modules rated for 8400 MT/s or higher and a 170 W Ryzen 9 9950X3D installed to enable the overclocked profile.

Will my existing PCIe 5.0 graphics card run at full bandwidth on the board's primary slot?

Yes, the PRIME B850M-K provides a PCIe 5.0 x16 slot so a 5.0 GPU operates at its maximum link speed.

How can I confirm the 128 MB L3 cache is active after the system posts?

Open UEFI BIOS or a hardware monitor in Windows and verify the L3 cache reads 128 MB for the 9950X3D.

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