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ASUS TUF B850M-PLUS WIFI motherboard and Ryzen 9 9900X CPU combo, mATX board with dark grey heatsinks and silver accents

ASUS

ASUS TUF GAMING B850M-PLUS WIFI AMD Motherboard & Ryzen 9 9900X Combo

SKU CH-META-9378X

Pairs a 12-core Ryzen 9 9900X with a B850 mATX board offering DDR5 to 8000 MT/s, PCIe 5.0 x16, three M.2 slots, Wi-Fi 6E and 2.5 Gb LAN

  • CPU socketAM5
  • ChipsetAMD B850
  • Form factorMicro ATX
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryUp to 8000+MT/s (OC)
  • Max supported RAM192 GB

Motherboard TUF GAMING B850M-PLUS WIFI

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CPU + Ryzen 9 9900X

  • Ready for demanding AI workloads with AM5 platform power and connectivity
  • 12 cores and 24 threads on Zen 5 architecture boost up to 5.6 GHz
  • Stable delivery from 14+2+1 80A DrMOS stages on 8-layer PCB
  • Fast storage via one PCIe 5.0 and two PCIe 4.0 M.2 slots with heatsink
  • Wi-Fi 6E, 2.5Gb LAN, USB 20Gbps and 10Gbps Type-C ports

Combo ready for advanced AI workloads

This bundle pairs an ASUS TUF GAMING B850M-PLUS WIFI motherboard with an AMD Ryzen 9 9900X processor. The board uses the AMD B850 chipset and AM5 socket to support Ryzen 9000, 8000 and 7000 series CPUs. It targets builders who want a compact mATX platform with strong connectivity and power delivery for demanding applications.

Memory capacity up to 192GB DDR5

Four 288-pin slots accept dual-channel DDR5 up to 8000+ MT/s when overclocked, with EXPO and AEMP profiles for easier tuning. The CPU provides a PCIe 5.0 x4 M.2 slot for the fastest storage, while the chipset adds two PCIe 4.0 M.2 slots and four SATA 6Gb/s ports. A single PCIe 5.0 x16 slot handles graphics, and a PCIe 4.0 x1 slot covers add-in cards.

Upgrades from older AM4 or entry AM5 builds

The 12-core, 24-thread Ryzen 9 9900X reaches 5.6 GHz max boost with 64 MB L3 cache and native DDR5-5600 support. The motherboard supplies 14+2+1 80A DrMOS stages, an 8-layer PCB and dual 8-pin ProCool connectors for stable overclocking. Wi-Fi 6E, 2.5Gbps LAN, rear USB 20Gbps Type-C and front USB 10Gbps Type-C complete the I/O upgrade.

How it compares

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

Price $760.99
Pricier than about 77% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model nameTUF GAMING B850M-PLUS WIFI+R9 9900X
Processor
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryUp to 8000+MT/s (OC)
Max supported RAM192 GB
Memory channelsDual Channel
ECC supportYes
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
M.2 slotsAMD Ryzen 9000 & 7000 Series Desktop Processors
M.2_1 slot (Key M), type 2280 (supports PCIe 5.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
AMD Ryzen 8000 Series Desktop Processors
M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode)**
AMD B850 Chipset
M.2_3 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
SATA and RAID supportAMD RAIDXpert2 Technology supports both PCIe RAID 0/1/5/10 and SATA RAID 0/1/5/10.
*RAID 5 Function is only supported by AMD Ryzen 9000 series CPU.
Audio & video
Audio chipRealtek ALC1220P
Sound channelsRealtek ALC1220P 7.1 Surround Sound High Definition Audio CODEC
- Impedance sense for front and rear headphone outputs
- Internal audio Amplifier to enhance the highest quality sound for headphone and speakers
- Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
- High quality 120 dB SNR stereo playback output and 113 dB SNR recording input (Line-in)
- Supports up to 32-Bit/192 kHz playback*
Audio Features
- Audio Shielding
- Premium audio capacitors
- Dedicated audio PCB layers
- Audio cover
- Unique de-pop circuit
* Due to limitations in HDA bandwidth, 32-Bit/192
Connectivity
Maximum network speed2.5 Gbit/s
Wi-Fi standardWi-Fi 802.11 ax
Bluetooth support5.3
Ports & slots
PCIe 5.0 x16 slotsAMD Ryzen 9000 & 7000 Series Desktop Processors
1 x PCIe 5.0 x16 slot (supports x16 mode)
PCIe 4.0 x16 slotsAMD Ryzen 8000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x8/x4 mode)
PCIe x1 slotsAMD B850 Chipset
1 x PCIe 4.0 x1 slot
Onboard USB headers1 x USB 10 Gbit/s connector (supports USB Type-C)
1 x USB 5 Gbit/s header supports 2 additional USB 5 Gbit/s ports
2 x USB 2.0 headers support 3 additional USB 2.0 ports
Power
Power connectors1 × 24-pin Main Power connector
2 × 8-pin +12 V CPU Power connectors
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Compatibility
Windows 11 supportSupported
More details
BIOS256 Mb Flash ROM, UEFI AMI BIOS

Other versions of this model

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Questions about this item

Will my existing DDR5 memory kits work with the Ryzen 9 9900X and this B850 board?

The board has four 288-pin DDR5 slots supporting up to 192GB in dual-channel mode, with EXPO and AEMP profiles for speeds up to 8000+ MT/s.

How can I confirm the 14+2+1 80A DrMOS power stages are delivering stable power to the 12-core CPU after assembly?

Use the onboard Q-Dashboard and Q-LED indicators alongside Fan Xpert 4 to monitor VRM temperatures and power-phase activity in real time.

Which M.2 heatsinks and Wi-Fi antenna come pre-installed, and what must I source separately for the three M.2 slots?

A massive M.2 heatsink covers the PCIe 5.0 and one PCIe 4.0 slot; the Q-Antenna for Wi-Fi 6E is included. You only add the M.2 SSDs themselves.

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