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ATX motherboard in dark finish with large CPU cooler, four DDR5 slots and multiple M.2 heatsinks

MSI

MSI X870 GAMING PLUS WIFI AMD motherboard & Ryzen 9 9900X CPU combo

SKU CH-AJPH-BTB4V

AM5 combo with 12-core Ryzen 9 9900X, DDR5 to 8200 MT/s, PCIe 5.0 graphics, Gen5 M.2, 5G LAN and Wi-Fi 7

  • CPU socketAM5
  • ChipsetAMD X870
  • Form factorATX
  • Memory slot count4 × 288pin (DDR5)
  • Max supported RAM256 GB
  • Memory channelsDual Channel

CPU R9 9900X

  • 12 cores and 24 threads handle heavy multitasking
  • DDR5 memory scales to 8200 MT/s for faster data rates
  • 14+2+1 Duet Rail power system delivers stable CPU voltage
  • PCIe 5.0 x16 slot and Gen5 M.2 enable maximum GPU and SSD bandwidth
  • Wi-Fi 7 and 5G LAN provide high-speed wired and wireless connectivity

AM5 platform for Ryzen 9000 series

The MSI X870 GAMING PLUS WIFI motherboard paired with the Ryzen 9 9900X processor delivers an AM5 socket platform for high-performance desktop builds. The CPU provides 12 cores and 24 threads based on the Zen 5 architecture with a 5.6 GHz maximum boost frequency. The board supports Ryzen 9000, 8000 and 7000 series processors and includes Wi-Fi 7 and 5G LAN connectivity.

DDR5 8200 MT/s overclocking ceiling

Memory compatibility centres on DDR5 with four 288-pin slots supporting up to 256 GB in dual-channel mode. Ryzen 9000 series processors can reach 8200+ MT/s with a single-rank single-DIMM configuration, 6400+ MT/s with a dual-rank single-DIMM setup and 5600 MT/s at JEDEC standard speeds. Non-ECC unbuffered modules are supported across the range.

14+2+1 Duet Rail power and extended heatsinks

A 14+2+1 Duet Rail power system with dual 8-pin CPU connectors feeds the 12-core processor under sustained loads. MOSFET thermal pads rated at 7W/mK, additional choke pads and the EZ M.2 Shield Frozr II dissipate heat across the 8-layer PCB with 2oz copper. This thermal array maintains stable operation during extended compute or gaming sessions.

How it compares

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

Price $733.99
Pricier than about 76% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Model nameX870 GAMING PLUS WIFI +R9 9900X
Processor
CPU socketAM5
ChipsetAMD X870
Memory
Memory slot count4 × 288pin (DDR5)
Max supported RAM256 GB
Memory channelsDual Channel
ECC supportNon-ECC
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
M.2 slots3x M.2
M.2_1 Source (From CPU) supports up to PCIe 5.0 x4, supports 2280/2260 devices
M.2_2 Source (From Chipset) supports up to PCIe 4.0 x4, supports 22110/2280 devices
M.2_3 Source (From Chipset) supports up to PCIe 4.0 x2, supports 2280/2260 devices
M2_1 slot
- Supports up to PCIe 5.0 x4 (For Ryzen 9000/ 7000 Series processors)
- Supports up to PCIe 4.0 x4 (For Ryzen 8000 Series processors)
*Please refer to the manual for M.2 SSD heatsink restrictions.
SATA and RAID supportSupports RAID 0 and RAID 1 for M.2 NVMe storage devices
Audio & video
Audio chipRealtek ALC897
Sound channels7.1 Channels
Connectivity
Ethernet controllerRealtek 8126VB 5G LAN
Maximum network speed5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
PCIe 5.0 x16 slotsPCI_E1 Gen PCIe 5.0 supports up to x16 (From CPU)
PCIe x4 slotsPCI_E4 Gen PCIe 4.0 supports up to x4 (From Chipset)
PCIe x1 slotsPCI_E2 Gen PCIe 3.0 supports up to x1 (From Chipset)
PCI_E3 Gen PCIe 3.0 supports up to x1 (From Chipset)
Additional slotsPCI_E1 slot
- Supports PCIe 5.0 x16 (For Ryzen 9000/ 7000 Series processors)
- Supports PCIe 4.0 x8 (For Ryzen 8700/ 8600/ 8400 Series processors)
- Supports PCIe 4.0 x4 (For Ryzen 8500/ 8300 Series processor)
* PCI_E4 slot will run at x2 speed when installing M.2 SSD in the M2_3 slot.
Onboard USB headers4 x USB 2.0 ports
2 x USB 5 Gbit/s Type A ports
1 x USB 10 Gbit/s Type C ports
Power
Power connectors1 x Power Connector(ATX_PWR)
2 x Power Connector(CPU_PWR)
1 x Power Connector(PCIE_PWR 8pin)
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
Compatibility
Windows 11 supportSupport for Windows 11 64-bit

Other versions of this model

5 more in the same range

Questions about this item

What does the 8200 MT/s DDR5 rating mean once the board is built?

It is the maximum overclocked speed reachable with a single rank kit in one slot; JEDEC standard operation runs at 5600 MT/s and dual-rank or two-DIMM configurations top out lower.

How does the PCIe 5.0 x16 slot limit graphics or add-in cards in practice?

The primary x16 slot runs at Gen 5 speeds straight from the Ryzen 9 9900X CPU, while the second full-length slot is Gen 4 x4 from the chipset and the remaining two are Gen 3 x1.

What clearance and mounting hardware does the 14+2+1 VRM and heatsink assembly need?

The extended heatsink with 7 W/mK MOSFET pads and choke pads sits over a 14+2+1 Duet Rail power stage fed by dual 8-pin CPU connectors; ensure your case and CPU cooler leave room for the tall VRM cover.

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