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ASUS TUF Gaming B850M-PLUS WIFI mATX motherboard with Ryzen 9 9900X3D CPU installed, dark grey finish with yellow accents

ASUS

ASUS TUF GAMING B850M-PLUS WIFI + Ryzen 9 9900X3D AMD motherboard & CPU combo

SKU CH-Z1YR-EV0WY

Pairs a 120W 12-core Ryzen 9 9900X3D with a B850 mATX board offering PCIe 5.0, DDR5 to 8000 MT/s, Wi-Fi 6E and 2.5Gb 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 9900X3D

  • Stable power for heavy loads with 14+2+1 80A DrMOS stages
  • Ultrafast storage via one PCIe 5.0 and two PCIe 4.0 M.2 slots
  • Low-latency networking from Wi-Fi 6E and 2.5Gb Ethernet
  • High-speed peripherals on rear USB 20Gbps and front USB 10Gbps Type-C
  • 128MB L3 cache on Ryzen 9 9900X3D accelerates gaming and AI workloads

AM5 combo for Ryzen 9000 8000 7000

This ASUS TUF GAMING B850M-PLUS WIFI motherboard and Ryzen 9 9900X3D CPU combo targets builders who want a ready-to-run AM5 platform. The processor delivers 120W TDP with 128MB L3 cache and 12MB L2 cache on TSMC 4nm Zen 5 architecture. The board supports up to 192GB of DDR5 across four 288-pin slots at up to 8000+ MT/s with EXPO and AEMP profiles. Integrated Radeon graphics provide baseline display output.

14+2+1 80A DrMOS power 8-layer PCB

The 14+2+1 80A DrMOS power stages sit on an 8-layer PCB fed by dual 8-pin ProCool connectors with alloy chokes and durable capacitors. One PCIe 5.0 M.2 2280 slot and two PCIe 4.0 M.2 slots (2242 2260 2280) share a massive heatsink. Rear I/O includes a USB 20Gbps Type-C port Wi-Fi 6E 2.5Gb LAN and 7.1 audio via Realtek ALC1220P. Front-panel USB 10Gbps Type-C connector is also present. DIY features include PCIe Slot Q-Release M.2 Q-Latch Q-Antenna Q-Dashboard Q-LED BIOS FlashBack and pre-mounted I/O shield.

Upgrade from older AM4 or early AM5

The jump is worth it when moving from AM4 or first-gen AM5 to gain PCIe 5.0 graphics and storage bandwidth DDR5 speeds beyond 8000 MT/s and the 9900X3D's 3D V-Cache for gaming workloads. Four SATA 6Gbps ports and RAIDXpert2 support PCIe and SATA RAID 0 1 5 10 keep existing drives usable. The mATX form factor fits smaller cases while retaining full connectivity for AI-ready workloads and high-refresh gaming.

How it compares

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

Price $877.99
Pricier than about 82% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model nameTUF GAMING B850M-PLUS WIFI+R9 9900 × 3D
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

What PCIe generation does the top M.2 slot use and what speed does it cap at?

The M.2_1 slot runs at PCIe 5.0 x4 so the drive is limited to the 5.0 bandwidth ceiling.

What clearance does the CPU cooler need for the 14+2+1 80A DrMOS VRM heatsink on this mATX board?

The enlarged VRM heatsink sits above the AM5 socket so any cooler must clear the heatsink height and the 8+8 pin ProCool connectors.

How is the Ryzen 9 9900X3D seated in the AM5 socket and which step is often missed?

Lift the retention arm, align the triangle marker on the CPU with the socket corner, lower the chip without force, close the arm and lock the lever — skipping the marker alignment is the common error.

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