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Compact Mini ITX motherboard with large heatsinks and CPU installed

ASUS

ASUS ROG STRIX X870-I GAMING WIFI AMD motherboard & Ryzen 9 9900X3D CPU combo

SKU CH-D5J2-A16CH

Mini ITX AM5 board with 10+2+1 power stages, DDR5 to 8400 MT/s, Wi-Fi 7 and PCIe 5.0 M.2 paired with a 12-core Ryzen 9 9900X3D and 128 MB L3 cache

  • ChipsetAMD X870
  • Form factorMini ITX
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryDDR5 4400
  • Max supported RAM96 GB
  • ECC supportNon-ECC

Model ROG STRIX X870-I GAMING WIFI

CPU +R9 9900X3D

  • Ready for advanced AI workloads with power and connectivity for demanding applications
  • Robust 10+2+1 power solution rated for 110A per stage supports multi-core processors
  • Optimised thermal design with massive heatsinks and high-conductivity thermal pads
  • DDR5 memory overclocking up to 8400+ MT/s with Ryzen 9000 series processors
  • WiFi 7 2x2 with 320MHz bandwidth delivers up to 6.5Gbps transfer rate

AMD AM5 Mini-ITX combo for AI workloads

The ASUS ROG STRIX X870-I GAMING WIFI motherboard pairs with a Ryzen 9 9900X3D processor in a single AM5 Mini-ITX package. It targets builders who need high core counts and large L3 cache for advanced AI computing in a compact chassis. The board delivers a 10+2+1 power solution rated for 110A per stage with ProCool II connectors. Wireless connectivity uses Wi-Fi 7 with 320MHz bandwidth for up to 6.5Gbps transfer rates.

Installation notes for the compact layout

The Mini-ITX form factor fits small cases but leaves limited working room around the CPU socket and M.2 slots. Builders should install the CPU, DDR5 memory and M.2 drives before mounting the board. The 8-pin CPU power and 24-pin main power connectors sit close to the board edge; route cables early. AEMP profiles simplify DDR5 setup up to 8400+ MT/s with Ryzen 9000 series processors. The single PCIe 5.0 x16 slot and two M.2 slots share bandwidth depending on the installed CPU generation.

Sustained-load behaviour with 120W TDP

The Ryzen 9 9900X3D runs at a 120W TDP with 128MB L3 cache and 12MB L2 cache. Massive heatsinks with integrated I/O cover and high-conductivity thermal pads handle extended multi-core workloads. The L-shaped backplate adds structural rigidity and helps spread heat. AI Cooling II adjusts fan curves dynamically during long renders or AI training sessions. The 2.5Gbps LAN and Wi-Fi 7 maintain stable throughput when moving large datasets over the network.

How it compares

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

Price $1,329.99
Pricier than about 92% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model nameROG STRIX X870-I GAMING WIFI+R9 9900 × 3D
Processor
ChipsetAMD X870
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryDDR5 4400
Max supported RAM96 GB
ECC supportNon-ECC
BufferingUn-buffered
Storage
SATA ports2 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)
AMD Ryzen 8000 Series Desktop Processors*
M.2_1 slot (Key M), type 2280(supports PCIe 4.0 x4 mode)
AMD X870 Chipset
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4)
*** Install ROG FPS Card to support 2 x SATA 6Gb/s ports.
SATA and RAID support* AMD RAIDXpert2 Technology supports both PCIe RAID 0/1/10 and SATA RAID 0/1
Connectivity
Maximum network speed2.5 Gbit/s
Bluetooth supportv5.4***
*** The Bluetooth version may vary, please refer to the Wi-Fi module manufacturer's website for the latest specifications.
Ports & slots
PCIe 5.0 x16 slotsAMD Ryzen 9000 & 7000 Series Desktop Processors
1 x PCIe 5.0 x16 slot
PCIe 4.0 x16 slotsAMD Ryzen 8000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x8/x4 mode)
USB 3.0 portsUSB4
Onboard USB headersUSB
1 x USB 10 Gbit/s connector (supports USB Type-C® )
1 x USB 5 Gbit/s header support(s) 2
additional USB 5 Gbit/s ports
Size & build
Form factorMini ITX
Width and length6.7 in × 6.7 in
More details
BIOS256 Mb Flash ROM, UEFI AMI BIOS

Other versions of this model

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Questions about this item

How can I confirm the Ryzen 9 9900X3D is running at its 120W TDP after installing the combo?

Enter the UEFI and check the CPU Power Management section; the 10+2+1 power stages rated for 110A each will report current draw matching the 120W specification under load.

What cooling parts are included with the motherboard and which must be purchased separately for the CPU?

The board ships with massive heatsinks, an integrated I/O cover, high-conductivity thermal pads and an L-shaped backplate; a CPU cooler or AIO for the AM5 socket is not included.

Which memory kit should I choose to reach the 8400 MT/s overclock listed for Ryzen 9000 series?

Select a DDR5 kit rated 8400 MT/s or higher with EXPO support; the two DIMM slots and AEMP firmware will train the modules to that speed when paired with the 9900X3D.

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