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ASUS PRIME B850M-K micro-ATX motherboard with AMD Ryzen 7 9800X3D CPU installed

ASUS

ASUS PRIME B850M-K & Ryzen 7 9800X3D Combo AMD motherboard

SKU CH-YG64-943WF

A motherboard and CPU bundle pairing an AM5 micro-ATX board with an 8-core 16-thread Ryzen 7 9800X3D processor featuring 96 MB L3 cache and a 5.2 GHz max boost, plus DDR5-8400 OC support.

  • CPU socketAM5
  • Ready-to-build motherboard and CPU combo
  • 8 cores and 16 threads for multitasking
  • 96 MB L3 cache accelerates gaming
  • DDR5 memory up to 8400 MT/s overclocked
  • PCIe 5.0 slot and 2.5 Gb Ethernet included

Combo B850M-K & Ryzen 7 9800X3D

This bundle pairs an ASUS PRIME B850M-K motherboard with an AMD Ryzen 7 9800X3D processor. The board uses the AM5 socket and a 6-layer PCB with an 8+2+1 power design. It targets builders who want a matched CPU and board without separate compatibility checks.

Who this suits and who it doesn’t

Gamers and creators gain 8 cores, 16 threads, and 96 MB L3 cache with 3D V-Cache technology. The board supports DDR5 up to 8400 MT/s overclocked and three M.2 slots. Users needing built-in Wi-Fi or more than one PCIe 5.0 slot should consider other options.

Deciding spec — PCIe 5.0 and 2.5 Gb Ethernet

The motherboard provides a PCIe 5.0 graphics slot and a Realtek 2.5 Gb wired network controller. Rear I/O includes a USB 10 Gbps Type-A port. These connectivity features determine whether the platform meets your peripheral and networking needs.

How it compares

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

Price $753.99
Pricier than about 76% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model namePRIME B850M-K+R7 9800 × 3D
Processor
CPU socketAM5

Questions about this item

What case clearance and standoff pattern does the PRIME B850M-K motherboard require?

The micro-ATX board fits standard mATX standoffs and uses a 6-layer PCB design; ensure the case provides VRM heatsink clearance above the 8+2+1 power modules.

Which BIOS step is often missed when installing the Ryzen 7 9800X3D into the AM5 socket?

Update the UEFI BIOS before first boot so the 8-core 16-thread Zen 5 CPU with 96 MB L3 cache and 5.2 GHz max boost is recognised correctly.

What cooling upkeep does the 8+2+1 VRM and M.2 heatsink arrangement need over time?

Clean dust from the VRM heatsinks, thermal pads and M.2 heatsink periodically; verify the 4-pin PWM/DC fan headers still spin the attached fans for sustained DDR5 8400 MT/s operation.

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