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ATX motherboard with silver heatsinks, black PCB, and Ryzen 9 9900X3D CPU in AM5 socket

MSI

MSI MAG B850 GAMING PLUS MAX WIFI AMD motherboard & Ryzen 9 9900X3D combo

SKU CH-DNBP-3BJ1X

AM5 motherboard and 12-core Ryzen 9 9900X3D with 128MB L3 cache, DDR5 to 8200 MT/s, PCIe 5.0 M.2, Wi-Fi 7 and 5G LAN

  • CPU Socket TypeAM5
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Maximum Memory Supported256GB
  • Channel SupportedDual Channel
  • ECC SupportedNon-ECC
  • Ready for future CPU upgrades with 64 MB BIOS capacity
  • Maximum CPU performance unlocked through OC Engine clock generator
  • Graphics card swaps simplified by EZ PCIe Release button
  • Gen 5 PCIe delivers up to 128 GB/s bandwidth for storage
  • 5 Gbps LAN and Wi-Fi 7 with 2.9 Gbps peak speed

Combo Motherboard and CPU

This bundle pairs an MSI MAG B850 GAMING PLUS MAX WIFI board with an AMD Ryzen 9 9900X3D processor on the AM5 platform. It targets enthusiasts building a high-performance desktop who want the CPU and motherboard matched out of the box. The board supports DDR5 memory and provides a 5G LAN port plus Wi-Fi 7 connectivity.

DDR5 Memory Boost up to 8200+ MT/s OC

The motherboard offers four 288-pin slots supporting dual-channel DDR5 up to 256 GB total capacity. Memory Boost technology is rated for overclocked speeds of 8200+ MT/s, which is the key figure for builders selecting RAM kits. Non-ECC un-buffered modules are required.

Tool-less M.2 and EZ PCIe Release

Installing M.2 SSDs uses a tool-less Shield Frozr design across three slots, one wired for PCIe 5.0 x4. The EZ PCIe Release button simplifies graphics card swaps. Builders should update the 64 MB BIOS before first boot to ensure full CPU compatibility and enable OC Engine features.

Highlights

  • Ready for future CPU upgrades with 64 MB BIOS capacity
  • Maximum CPU performance unlocked through OC Engine clock generator
  • Graphics card swaps simplified by EZ PCIe Release button
  • Gen 5 PCIe delivers up to 128 GB/s bandwidth for storage
  • 5 Gbps LAN and Wi-Fi 7 with 2.9 Gbps peak speed

Specifications

BrandMSI
ModelMAG B850 GAMING PLUS MAX WIFI+R9 9900X3D
CPU Socket TypeAM5
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Maximum Memory Supported256GB
Channel SupportedDual Channel
ECC SupportedNon-ECC
Buffer SupportedUn-buffered
PCI Express 4.0 x161 x PCI Express 4.0 x16
PCI Express 3.0 x161 x PCI Express 3.0 x16
M.23 x M.2 (Support PCIe 5.0 x4, PCIe 4.0 x4, PCIe 4.0 x2)
Onboard Video ChipsetDepends on installed processor
Audio ChipsetRealtek ALC897
Audio Channels7.1 Channels
LAN ChipsetRealtek 8126
Max LAN Speed5Gbps
BluetoothYes
Back I/O Ports4 x USB 2.0
1 x USB 5Gbps Type-A
1 x USB 10Gbps Type-A
2 x USB 10Gbps Type-C
1 x DisplayPort
COM1
DisplayPort1 x DisplayPort
Onboard USB4 x USB 5Gbps + 4 x USB 2.0 + 1 x USB Type-C header, with USB 5Gbps
Form FactorATX
LED LightingRGB
Dimensions (W x L)243.84mm x 304.8mm

Questions about this item

How does the 128MB L3 cache on the Ryzen 9 9900X3D behave once the processor is installed in a working system?

The 128MB L3 cache on the Ryzen 9 9900X3D provides a large on-die buffer that reduces memory latency for gaming and heavy workloads when the CPU is seated in the AM5 socket.

What does the PCIe 5.0 x4 M.2 interface on this board actually cap at in real use?

The primary M.2 slot runs at PCIe 5.0 x4, delivering up to 128GB/s bandwidth for compatible SSDs, while the two additional M.2 slots operate at PCIe 4.0 speeds.

What physical clearance does the MAG B850 GAMING PLUS MAX WIFI need for the CPU cooler mounting?

The board uses the standard AM5 socket with a 4-hole mounting pattern, so any AM5-compatible cooler will align without extra brackets.

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