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A dark green Micro ATX motherboard with silver heatsinks and a silver AM5 CPU socket cover, shown flat on a light background

MSI

MSI PRO B850M-P WIFI + Ryzen 7 9800X3D AMD motherboard combo

SKU CH-3ADK-KKBEK

AM5 motherboard and 8-core Ryzen 7 9800X3D combo with DDR5 8200+ support, Wi-Fi 7, Bluetooth 5.4, 5G LAN, PCIe 5.0 x16, 4K HDMI 2.1 and DisplayPort 1.4

  • 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 7 9800X3D

  • Ready-to-build combo with matched CPU and board
  • 8-core 16-thread Zen 5 processor with 96 MB L3 cache
  • DDR5 memory up to 8200 MT/s across four slots
  • Wi-Fi 7 and 5 GbE LAN for fast wireless and wired links
  • HDMI 2.1 and DisplayPort 1.4 enable 4K 60 Hz output

Combo for AM5 builders

This bundle pairs the MSI PRO B850M-P WIFI motherboard with the AMD Ryzen 7 9800X3D processor. It targets enthusiasts building a compact Micro ATX system on the AM5 platform. The board supports Ryzen 7000, 8000 and 9000 series CPUs and delivers dual-channel DDR5 memory up to 256 GB across four 288-pin slots.

PCIe 5.0 graphics slot and 5G wired LAN

The board provides one PCI Express 5.0 x16 slot for a graphics card and three PCIe 3.0 x1 slots for add-in cards. Networking uses a Realtek 8126 5G LAN controller alongside Wi-Fi 7 and Bluetooth 5.4. Video output includes HDMI 2.1 and DisplayPort 1.4, both requiring processor graphics for 4K at 60 Hz.

Replaces older AM4 or early AM5 kits

The Ryzen 7 9800X3D brings 8 cores, 16 threads, a 5.2 GHz max boost and 96 MB L3 cache on the Zen 5 architecture. It supports DDR5-5600 natively and is unlocked for overclocking. The jump is worth it when moving from an AM4 platform or a non-3D V-Cache AM5 CPU to gain the gaming latency benefits of second-generation 3D V-Cache technology.

Highlights

  • Ready-to-build combo with matched CPU and board
  • 8-core 16-thread Zen 5 processor with 96 MB L3 cache
  • DDR5 memory up to 8200 MT/s across four slots
  • Wi-Fi 7 and 5 GbE LAN for fast wireless and wired links
  • HDMI 2.1 and DisplayPort 1.4 enable 4K 60 Hz output

Specifications

BrandMSI
ModelPRO B850M-P WIFI+R7 9800X3D
Part NumberPRO B850M-P WIFI+R7 9800X3D
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 7 9800X3D 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

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Should I pick the 256 GB DDR5 kit or a smaller capacity for this board?

The board has four DDR5 slots and supports up to 256 GB in dual-channel mode, so a 256 GB kit fills every slot and leaves no room for later expansion.

What does the 5.2 GHz max boost on the Ryzen 7 9800X3D actually deliver in a built system?

The 8-core, 16-thread Zen 5 CPU can hit 5.2 GHz on light loads; sustained all-core speeds will be lower and depend on your cooler and motherboard power limits.

Which PCIe generation does the top x16 slot run at, and what does that cap for a graphics card?

The primary slot is PCIe 5.0 x16, so a compatible GPU can use the full 5.0 bandwidth; the three remaining x1 slots are limited to PCIe 3.0 speeds.

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