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Compact mini-ITX motherboard with large heatsinks and installed Ryzen 9 9900X CPU

ASUS

ASUS ROG Strix B850-I Gaming WiFi AMD motherboard & Ryzen 9 9900X CPU Combo

SKU CH-94XH-69BG3

Mini-ITX AM5 board paired with a 12-core Ryzen 9 9900X, 10+2+1 70A power stages, dual PCIe 5.0 M.2 slots, WiFi 7, 2.5G LAN and 96GB DDR5 support

  • CPU socketAM5
  • ChipsetAMD B850
  • Form factorMini ITX
  • Memory slot count2 × 288pin (DDR5)
  • Max supported RAM96 GB
  • Memory channelsDual Channel

Motherboard ROG STRIX B850-I GAMING WIFI

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CPU + Ryzen 9 9900X

  • Ready for Ryzen 9000, 8000 and 7000 series with AM5 socket
  • 12 cores and 24 threads reach 5.6 GHz max boost on Zen 5 architecture
  • 10+2+1 power stages rated to 70A with ProCool connectors for stable delivery
  • Two PCIe 5.0 M.2 slots, one heatsinked, for fast storage expansion
  • WiFi 7 and 2.5 Gbps LAN with Bluetooth 5.4 for high-speed networking

Compact AM5 platform

This bundle pairs the ROG Strix B850-I Gaming WiFi motherboard with the Ryzen 9 9900X processor for a Mini-ITX build. The board uses the AMD B850 chipset and an AM5 socket that supports Ryzen 9000, 8000 and 7000 series CPUs. Two DDR5 slots accept up to 96 GB of memory in dual-channel mode with ECC support. It targets enthusiasts who need high core counts in a small chassis.

Sustained 70 A power delivery

The 10+2+1 stage VRM is rated for up to 70 A per stage and uses ProCool power connectors to handle continuous current. Massive heatsinks with an integrated I/O cover and high-conductivity thermal pads dissipate heat during long workloads. AI Overclocking and AI Networking II adapt voltages and traffic in real time to keep performance stable. AEMP and EXPO profiles simplify memory tuning for extended sessions.

12-core Zen 5 CPU included

The Ryzen 9 9900X brings 12 cores and 24 threads based on the Zen 5 architecture with a 5.6 GHz maximum boost clock and 64 MB of cache. It is unlocked for overclocking and plugs directly into the AM5 socket. This processor determines the compute ceiling for rendering, compilation and multi-tasking workloads. The combination delivers a complete high-performance foundation in a compact form factor.

How it compares

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

Price $910.99
Pricier than about 84% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model nameROG STRIX B850-I GAMING WIFI+R9 9900X
Processor
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count2 × 288pin (DDR5)
Max supported RAM96 GB
Memory channelsDual Channel
ECC supportYes
BufferingUn-buffered
Storage
SATA ports2 x SATA 6Gb/s
M.2 slotsAMD Ryzen 9000 & 7000 Series Desktop Processors*
M.2_1 slot (Key M), type02242/2260/2280 (supports PCIe 5.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode)
AMD Ryzen 8000 Series Desktop Processors*
M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
SATA and RAID supportAMD RAIDXpert2 Technology supports both PCIe RAID 0/1/10 and SATA RAID 0/1
Audio & video
Audio chipRealtek ALC4080
Sound channelsROG SupremeFX 7.1 Surround Sound High Definition Audio CODEC ALC4080*
- Impedance sense for front and rear headphone outputs
- Supports: Jack-detection, Multi-streaming, Front Panel MIC Jack-retasking
- High quality 120 dB SNR stereo playback output and 110 dB SNR recording input
- Supports up to 32-Bit/384 kHz playback on front panel
Audio Features
- SupremeFX Shielding Technology
- Savitech SV3H712 AMP
- Rear optical S/PDIF out port
- Premium audio capacitors
- Unique de-pop circuit
Connectivity
Maximum network speed2.5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
PCIe 5.0 x16 slotsAMD Ryzen 9000 & 7000 Series Desktop Processors
1 x PCIe 5.0 x16 slot(s)
PCIe 4.0 x16 slotsAMD Ryzen 8000 Series Desktop Processors
1 x PCIe 4.0 x16 slot(s)
Power
Power connectors1 × 24-pin Main Power connector
1 × 8-pin +12 V CPU Power connector
Size & build
Form factorMini ITX
Width and length6.7 in × 6.7 in
Compatibility
Windows 11 supportWindows 11, Windows 10 64-bit
Windows 11 (22H2 later)
More details
BIOS256 Mb Flash ROM, UEFI AMI BIOS // UEFI AMI BIOS(text-based)

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