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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 Socket TypeAM5
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Maximum Memory Supported256GB
  • Channel SupportedDual Channel
  • PCI Express 5.0 x161 x PCI Express 5.0 x16

+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.

Highlights

  • 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

Specifications

BrandMSI
ModelPRO B850M-P WIFI+R9 9900X3D
Part NumberPRO B850M-P WIFI+R9 9900X3D
CPU Socket TypeAM5
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Maximum Memory Supported256GB
Channel SupportedDual Channel
PCI Express 5.0 x161 x PCI Express 5.0 x16
PCI Express x13 x PCIe 3.0 x1 slots
Serial ATA (SATA)4 x SATA 6Gb/s
LAN ChipsetRealtek 8126 5G LAN
Wireless LANWi-Fi 7 Solution
BluetoothBluetooth 5.4
HDMI1 x HDMI
RJ451 x RJ45
DisplayPort1 x DisplayPort
USB 3.12 x USB 5Gbps Type-A
1 xUSB 10Gbps Type-A
USB 1.1/2.04 x USB 2.0
USB Type-C1xUSB 10Gbps Type-C
Audio Ports3 Ports
Onboard USB1 x AMD Ryzen 9 9900X3D CPU
1 x Shin-Etsu X-23-7868-2D (1.8g)
4 x USB 2.0
4 x USB 5Gbps Type-A
1 x USB 10Gbps Type-C
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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