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MSI PRO B850M-P WIFI motherboard and Ryzen 9 9900X3D processor combo in micro-ATX layout

MSI

MSI PRO B850M-P WIFI + Ryzen 9 9900X3D AMD motherboard & CPU combo

SKU CH-26W8-9QQS9

Socket AM5 micro-ATX board with Wi-Fi 7, Bluetooth 5.4, dual-channel DDR5 to 8200 MT/s and a 12-core Zen 5 CPU with 128 MB L3 cache

  • CPU socketAM5
  • ChipsetAMD B850
  • Form factorMicro ATX
  • Memory slot count4 × 288pin (DDR5)
  • Max supported RAM256 GB
  • Memory channelsDual Channel

CPU +Ryzen 9 9900X3D

  • 12-core Ryzen 9 9900X3D with 128MB L3 cache for heavy multitasking
  • DDR5 up to 8200 MT/s on four slots for high bandwidth
  • PCIe 5.0 x16 slot for next-gen GPU throughput
  • Wi-Fi 7 and 5G LAN for fast wireless and wired networking
  • HDMI 2.1 and DisplayPort 1.4 enable 4K 60 Hz output

Ready combo for AM5 builds

This bundle pairs the MSI PRO B850M-P WIFI motherboard with the AMD Ryzen 9 9900X3D processor. The board uses the AMD B850 chipset and an AM5 socket that accepts Ryzen 7000, 8000 and 9000 series CPUs. Four DDR5 slots support up to 256 GB in dual-channel mode with overclocked speeds beyond 8200 MT/s.

Straightforward drop-in install

The processor seats in the standard AM5 LGA socket with no pins to bend. DDR5 modules click into the four 288-pin slots and the single PCIe 5.0 x16 slot takes a full-length graphics card. Three PCIe 3.0 x1 slots and four SATA 6Gb/s ports handle extra cards and drives. The I/O shield is pre-fitted, so the only common snag is forgetting to plug the 8-pin CPU power connector before the first boot.

Suits high-core gaming rigs

Twelve Zen 5 cores with 128 MB L3 cache and a 120 W TDP make the 9900X3D strong for gaming and threaded workloads. Onboard Radeon graphics drive a 4K 60 Hz display over HDMI 2.1 or DisplayPort 1.4 when a discrete GPU is not installed. Wi-Fi 7, Bluetooth 5.4 and a Realtek 8126 5G LAN port cover modern networking. Builders needing more than one PCIe 5.0 x16 slot or a larger ATX form factor should consider a different board.

How it compares

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

Price $800.99
Pricier than about 78% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Model namePRO B850M-P WIFI+R9 9900 × 3D
Part numberPRO B850M-P WIFI+R9 9900 × 3D
Processor
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Max supported RAM256 GB
Memory channelsDual Channel
Storage
SATA ports4 x SATA 6Gb/s
Connectivity
Ethernet controllerRealtek 8126 5G LAN
Wi-Fi standardWi-Fi 7 Solution
Bluetooth support5.4
Ports & slots
PCIe 5.0 x16 slots1 x PCI Express 5.0 x16
PCIe x1 slots3 x PCIe 3.0 x1 slots
HDMI ports1 x HDMI
Ethernet port1 x RJ45
DisplayPort connectors1 x DisplayPort
USB 3.1 ports2 x USB 5 Gbit/s Type-A
1 xUSB 10 Gbit/s Type-A
USB 2.0 ports4 x USB 2.0
USB-C ports1xUSB 10 Gbit/s Type-C
Audio jacks3 Ports
Onboard USB headers1 x AMD Ryzen 9 9900 × 3D CPU
1 x Shin-Etsu X-23-7868-2D (1.8g)
4 x USB 2.0
4 x USB 5 Gbit/s Type-A
1 x USB 10 Gbit/s Type-C
Size & build
Form factorMicro ATX

Other versions of this model

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Questions about this item

How do I confirm the Ryzen 9 9900X3D is running at its 120W TDP after assembly?

Enter the BIOS and verify the CPU package power limit reads 120W; under load the board's VRM should sustain that figure without throttling.

Which cables or adapters are missing from the box for the four SATA 6Gb/s ports and the single DisplayPort 1.4 output?

The combo includes the motherboard and CPU only; you must supply SATA data cables, SATA power leads from the PSU, and a DisplayPort cable for 4K@60Hz video.

Should I pick the 256GB maximum capacity or a lower DDR5 kit for the four 288-pin slots?

Four slots support up to 256GB total; choose a dual-channel kit rated for 8200 MT/s OC to match the board's validated speed.

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