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ASUS TUF Gaming B850M-PLUS micro-ATX motherboard with Ryzen 9 9900X CPU installed, dark grey PCB, black VRM heatsinks

ASUS

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

SKU CH-JHVX-36R0W

Combines a B850 mATX board with AM5 socket, 2 DDR5 slots up to 256 GB, PCIe 5.0 x16 and dual M.2, Realtek 2.5 Gb LAN plus WiFi 6E, USB 20 Gbps Type-C.

  • CPU Socket TypeAM5

Motherboard TUF GAMING B850M-PLUS

Struck-through versions exist but are not stocked here.

CPU + Ryzen 9 9900X

  • 12-core 24-thread Ryzen 9 9900X for heavy multitasking
  • DDR5 memory up to 256 GB with EXPO and AEMP support
  • PCIe 5.0 x16 SafeSlot plus dual M.2 slots for fast GPU and storage
  • Realtek 2.5Gb LAN and WiFi 6E for responsive networking
  • Q-Release GPU latch and M.2 Q-Latch simplify component installation

ASUS TUF Gaming B850M-PLUS & Ryzen 9 9900X Combo

This bundle pairs a micro-ATX motherboard with a 12-core desktop processor. The board uses the AM5 socket and provides two DDR5 slots supporting up to 256 GB with AEMP and EXPO profiles. It includes a PCIe 5.0 x16 SafeSlot, two M.2 slots at PCIe 5.0 x4 and 4.0 x4, Realtek 2.5Gb LAN, WiFi 6E, a USB 3.2 Gen2x2 Type-C port at 20 Gbps, and Realtek ALC1220P 7.1 audio.

Who this suits and who should look elsewhere

Builders wanting a compact AM5 platform with strong single-thread performance and 24 threads for rendering or heavy multitasking will benefit. The 5.6 GHz max boost and 64 MB L3 cache handle demanding workloads. Users needing four memory slots, more than two M.2 drives, or a bundled cooler should consider other options.

Deciding specification: 12 cores and 24 threads

The processor delivers 12 cores and 24 processing threads on the Zen 5 architecture with a 5.6 GHz max boost frequency. This core count is the primary factor for choosing this combo over 8-core alternatives for parallel workloads. DDR5-5600 support and PCIe 5.0 readiness complete the platform capabilities.

Highlights

  • 12-core 24-thread Ryzen 9 9900X for heavy multitasking
  • DDR5 memory up to 256 GB with EXPO and AEMP support
  • PCIe 5.0 x16 SafeSlot plus dual M.2 slots for fast GPU and storage
  • Realtek 2.5Gb LAN and WiFi 6E for responsive networking
  • Q-Release GPU latch and M.2 Q-Latch simplify component installation

Specifications

BrandASUS
ModelTUF GAMING B850M-PLUS+R9 9900X
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 PCIe standard does the TUF GAMING B850M-PLUS use for its primary GPU slot, and what bandwidth does that cap the card at?

The board provides a single PCIe 5.0 x16 SafeSlot for the graphics card, so a compatible GPU can run at the full 5.0 signalling rate.

What physical clearance does the mATX TUF GAMING B850M-PLUS need inside a case for the CPU cooler and I/O shield?

The board uses the standard AM5 socket keep-out zone and ships with a pre-mounted I/O shield, so any case that accepts mATX and an AM5 cooler will fit.

How is the Ryzen 9 9900X seated in the AM5 socket, and which step do builders most often miss?

Lift the retention arm, align the triangle on the processor with the socket corner, lower the chip without pressure, close the arm, then attach the cooler — skipping the alignment check is the common error.

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