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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 Socket TypeAM5
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardUp to 8000+MT/s (OC)
  • Maximum Memory Supported192GB
  • Channel SupportedDual Channel

Motherboard TUF GAMING B850M-PLUS WIFI

Struck-through versions exist but are not stocked here.

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.

Highlights

  • 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

Specifications

BrandASUS
ModelTUF GAMING B850M-PLUS WIFI+R9 9900X3D
CPU Socket TypeAM5
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardUp to 8000+MT/s (OC)
Maximum Memory Supported192GB
Channel SupportedDual Channel
ECC SupportedYes
Buffer SupportedUn-buffered
Memory FeatureDual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO)
ASUS Enhanced Memory Profile (AEMP)
PCI Express 5.0 x16AMD Ryzen 9000 & 7000 Series Desktop Processors
1 x PCIe 5.0 x16 slot (supports x16 mode)
PCI Express 4.0 x16AMD Ryzen 8000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x8/x4 mode)
PCI Express x1AMD B850 Chipset
1 x PCIe 4.0 x1 slot
Serial ATA (SATA)4 x SATA 6Gb/s
M.2AMD 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 RAIDAMD 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 ChipsetRealtek ALC1220P
Audio 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
Max LAN Speed2.5Gbps
Wireless LANWi-Fi 802.11 ax
BluetoothBluetooth 5.3
Back I/O Ports1 x USB 20Gbps port (1 x USB Type-C)
3 x USB 10Gbps ports (3 x Type-A)
4 x USB 5Gbps ports (4 x Type-A)
4 x USB 2.0 ports (4 x Type-A)
1 x DisplayPort
1 x HDMI port
1 x Wi-Fi module
1 x Realtek 2.5Gb Ethernet port
5 x Audio jacks
1 x BIOS FlashBack button
Onboard USB1 x USB 10Gbps connector (supports USB Type-C)
1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
2 x USB 2.0 headers support 3 additional USB 2.0 ports
Other ConnectorsFan and Cooling Related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
1 x 4-pin AIO Pump header
3 x 4-pin Chassis Fan headers
Miscellaneous
3 x Addressable Gen 2 headers
1 x Clear CMOS header
1 x Chassis Intrusion header
1 x COM Port header
1 x Front Panel Audio header (F_AUDIO)
1 x 10-1 pin Front System Panel header
Form FactorMicro ATX
Dimensions (W x L)9.6" x 9.6"
Power Pin1 x 24-pin Main Power connector
2 x 8-pin +12V CPU Power connectors
BIOS Feature256 Mb Flash ROM, UEFI AMI BIOS
SoftwareASUS Exclusive Software
Armoury Crate
- Aura Creator
- Aura Sync
- Fan Xpert 4
- Power Saving
ASUS DriverHub
ASUS GlideX
TurboV Core
TUF GAMING CPU-Z
DTS Audio Processing
Norton 360 for Gamers (60 Days Free Trial)
WinRAR (40 Days Free Trial)
UEFI BIOS
ASUS EZ DIY
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
- ASUS UEFI BIOS EZ Mode
- ASUS MyHotkey
Windows 11Supported
FeaturesASUS TUF PROTECTION
- DIGI+ VRM (- Digital power design with DrMOS)
- ESD Guards
- TUF LANGuard
- Overvoltage protection
- SafeSlot
- Stainless-steel back I/O
ASUS Q-Design
- M.2 Q-Latch
- PCIe Slot Q-Release
- Q-Antenna
- Q-Dashboard
- Q-DIMM
- Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow green])
ASUS Thermal Solution
- M.2 heatsink
- VRM heatsink design
ASUS EZ DIY
- BIOS FlashBack button
- BIOS FlashBack LED
- ProCool
- Pre-mounted I/O shield
- SafeDIMM
Aura Sync
- Addressable Gen 2 headers
Package Contents1 x AMD Ryzen 9 9900X3D CPU
1 x Shin-Etsu X-23-7868-2D (1.8g)
Cables
2 x SATA 6Gb/s cables
Miscellaneous
1 x ASUS WiFi Q-Antenna
1 x TUF GAMING sticker
2 x M.2 rubber packages
1 x Screw package for M.2 SSD
Documentation
1 x Quick start guide

Other versions of this model

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

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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