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ASUS TUF B850M-PLUS mATX board with Ryzen 9 9900X3D CPU in AM5 socket

ASUS

ASUS TUF GAMING B850M-PLUS & Ryzen 9 9900X3D AMD motherboard & CPU combo

SKU CH-Y9BK-Y4Y3K

A motherboard and CPU bundle with AM5 socket, DDR5 memory support, PCIe 5.0 graphics slot, dual M.2 drives, 2.5Gb Ethernet, WiFi 6E, 20Gbps USB-C and Radeon graphics

  • CPU Socket TypeAM5

Motherboard TUF GAMING B850M-PLUS

Struck-through versions exist but are not stocked here.

CPU + Ryzen 9 9900X3D

  • Ready-to-build combo with pre-paired Ryzen 9 9900X3D CPU
  • High-speed DDR5 memory support up to 256GB capacity
  • Fast PCIe 5.0 x16 GPU slot plus dual M.2 storage
  • Wired 2.5Gb LAN and WiFi 6E for low-latency networking
  • 20Gbps USB Type-C and 7.1 HD audio on rear I/O

Combo AM5 mATX with Ryzen 9 9900X3D

This bundle pairs the ASUS TUF GAMING B850M-PLUS motherboard with the AMD Ryzen 9 9900X3D processor. The board uses the AM5 socket and supports Ryzen 9000, 8000 and 7000 series CPUs. It provides two DDR5 DIMM slots with a maximum capacity of 256 GB, plus AEMP optimisation and EXPO support. A single PCIe 5.0 x16 SafeSlot handles graphics cards while two M.2 sockets offer PCIe 5.0 x4 and PCIe 4.0 x4 storage lanes with AMD RAID 0, 1, 5 and 10.

Best for high-end gaming and content creation

The included Ryzen 9 9900X3D delivers 128 MB of L3 cache and 12 MB of L2 cache on a TSMC 4 nm Zen 5 core running at 120 W TDP, with integrated AMD Radeon graphics. Builders who need maximum gaming frame rates and strong multi-threaded throughput will benefit from the large cache and high core count. Users planning compact ITX builds or who require more than two memory slots should consider alternative form factors.

120 W CPU TDP guides cooling choice

The processor carries a 120 W thermal design power, so the cooling solution must be rated for at least that level. The motherboard supplies dedicated CPU, OPT and AIO pump headers alongside VRM heatsinks to manage power delivery heat. Selecting a cooler or liquid loop matched to this TDP ensures stable operation under sustained loads.

Highlights

  • Ready-to-build combo with pre-paired Ryzen 9 9900X3D CPU
  • High-speed DDR5 memory support up to 256GB capacity
  • Fast PCIe 5.0 x16 GPU slot plus dual M.2 storage
  • Wired 2.5Gb LAN and WiFi 6E for low-latency networking
  • 20Gbps USB Type-C and 7.1 HD audio on rear I/O

Specifications

BrandASUS
ModelTUF GAMING B850M-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

How loud or hot does the Ryzen 9 9900X3D get when running all day at 120W?

The CPU has a 120W TDP; the motherboard provides dedicated CPU, OPT and AIO pump headers plus VRM heatsinks to manage thermals.

What memory and cooling parts must I already own for this AM5 combo to work?

You need DDR5 modules for the two DIMM slots (max 256GB) and a compatible AM5 cooler; the board includes pump headers for AIO or air solutions.

Will my older PCIe 4.0 graphics card and M.2 drives work in the PCIe 5.0 x16 slot and the dual M.2 slots?

Yes — the PCIe 5.0 x16 SafeSlot and the two M.2 slots (PCIe 5.0 x4 and PCIe 4.0 x4) are backward compatible with earlier PCIe generations.

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