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ATX motherboard with AM5 CPU socket and pre-mounted I/O shield

ASUS

ASUS PRIME B850-PLUS & Ryzen 9 9900X3D AMD motherboard & CPU combo

SKU CH-GK0M-1SBBD

A motherboard and CPU combo with a 12+2 phase power design, three M.2 slots including one PCIe 5.0 x4, 2.5Gb Ethernet, DDR5 support and a 12-core Ryzen 9 9900X3D processor featuring 128MB L3 cache

  • CPU Socket TypeAM5

Motherboard PRIME B850-PLUS

CPU + R9 9900X3D

  • Stable power for demanding CPUs with 12+2 phase VRM design
  • Faster DDR5 speeds on any kit via ASUS AEMP technology
  • Three high-speed M.2 slots including one PCIe 5.0 x4 slot
  • Reliable wired networking through 2.5Gb Ethernet with LANGuard protection
  • Simplified building with pre-mounted I/O shield and advanced fan control

Combo Overview

The ASUS PRIME B850-PLUS motherboard paired with the AMD Ryzen 9 9900X3D processor forms a ready-to-install AM5 platform. The board delivers a 12+2 phase power design with Digi+ VRM for stable delivery to the 120W CPU. It supports DDR5 memory optimised through AEMP and provides three M.2 slots including one PCIe 5.0 x4 and two PCIe 4.0 x4 interfaces.

Suitability

Builders who want a combined motherboard and CPU solution with strong multi-threaded performance and integrated Radeon graphics will find this combo appropriate. The 128MB L3 cache and 12MB L2 cache benefit gaming and content-creation workloads. Users needing wireless networking or a different socket type should consider alternatives that explicitly include those features.

Deciding Spec

The single specification that determines fit is the AM5 socket combined with the 120W Ryzen 9 9900X3D processor. This pairing dictates compatible coolers, memory generation and power-phase requirements for the intended workload.

Highlights

  • Stable power for demanding CPUs with 12+2 phase VRM design
  • Faster DDR5 speeds on any kit via ASUS AEMP technology
  • Three high-speed M.2 slots including one PCIe 5.0 x4 slot
  • Reliable wired networking through 2.5Gb Ethernet with LANGuard protection
  • Simplified building with pre-mounted I/O shield and advanced fan control

Specifications

BrandASUS
ModelPRIME B850-PLUS+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 this board fit a standard ATX case and use the same DDR5 memory I plan to buy?

The motherboard is an ATX form factor and runs DDR5, so any ATX-compatible case and DDR5 kit will physically fit.

Can I run a graphics card and three fast SSDs at the same time without bandwidth conflicts?

One M.2 slot operates at PCIe 5.0 x4 and the other two at PCIe 4.0 x4, giving each SSD a dedicated four-lane link while the primary graphics slot remains unaffected.

Is the included CPU cooled by the stock Wraith cooler or do I need a separate solution?

The Ryzen 9 9900X3D has a 120 W TDP and does not ship with a cooler, so a capable air or liquid cooler rated for at least 120 W is required.

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