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ASUS ROG Strix B850-I motherboard and Ryzen 7 9800X3D CPU combo, compact mini-ITX board with dark heatsinks and integrated I/O cover

ASUS

ASUS ROG Strix B850-I Gaming WiFi & Ryzen 7 9800X3D Combo AMD Motherboard

SKU CH-MZS4-0A5BQ

A compact AM5 motherboard paired with a Ryzen 7 9800X3D CPU, delivering 10+2+1 power stages rated to 70A, dual DDR5 slots up to 96GB, two PCIe 5.0 M.2 slots, 2.5G LAN.

  • 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 7 9800X3D

  • Ready for Ryzen 9000, 8000 and 7000 series processors with AM5 socket
  • AI Overclocking, AI Networking II and AEMP simplify setup and boost performance
  • 10+2+1 power stages rated to 70A each with ProCool connectors for stable delivery
  • Two PCIe 5.0 M.2 slots, one heatsink-cooled, support 2242/2260/2280 drives
  • WiFi 7 and 2.5 Gb Ethernet plus Bluetooth 5.4 for fast wireless and wired links

Ready AM5 mini-ITX combo

This bundle pairs the ROG Strix B850-I Gaming WiFi motherboard with the Ryzen 7 9800X3D processor. The board uses the AM5 socket and B850 chipset in a compact mini-ITX layout. It targets builders who want high gaming performance in a small chassis without assembling separate parts.

10+2+1 power stages with ProCool

The voltage regulator delivers up to 70A per stage through solid ProCool connectors. Massive heatsinks merge with a pre-mounted I/O shield and high-conductivity pads to cool the VRM and M.2_1 slot. DIY aids include PCIe Slot Q-Release Slim, M.2 Q-Slide, Q-Latch, Q-Antenna, Q-Dashboard, Q-LED, BIOS FlashBack, Clear CMOS and FlexKey buttons.

DDR5 up to 96 GB dual channel

Two 288-pin slots support un-buffered DDR5 with ECC, EXPO and AEMP profiles in dual-channel mode. The platform ceiling of 96 GB decides whether this board fits a given workload..storage and memory plan.

How it compares

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

Price $1,068.99
Pricier than about 90% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameASUS
Model nameROG STRIX B850-I GAMING WIFI+R7 9800 × 3D
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)

Other versions of this model

5 more in the same range

Questions about this item

Will the board fit in a standard mini-ITX case and clear a large CPU cooler?

The board uses the mini-ITX form factor with a pre-mounted I/O shield and massive heatsinks that integrate the I/O cover, so check your case’s CPU-cooler height limit and motherboard standoff layout before buying.

What memory kits can I run at the full 96 GB capacity?

Two DDR5 DIMM slots support dual-channel un-buffered memory up to 96 GB total; use EXPO-certified or AEMP-compatible kits for automatic overclock profiles.

Can I add two high-speed M.2 drives and still keep them cool?

Two Key M slots accept 2242, 2260 or 2280 drives at PCIe 5.0 x4 speeds; the primary slot has a large dedicated heatsink while the second slot relies on airflow from the board’s thermal design.

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