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Compact Mini-ITX motherboard in dark metallic finish with large heatsinks and integrated I/O cover, paired with a Ryzen 9 9900X CPU

ASUS

ASUS AMD motherboard ROG STRIX X870-I GAMING WIFI with Ryzen 9 9900X

SKU CH-1J81-DE7B6

Mini-ITX AM5 board paired with a 12-core Ryzen 9 9900X, DDR5 to 8400 MT/s, Wi-Fi 7 and PCIe 5.0 M.2

  • 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

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CPU + Ryzen 9 9900X

  • AMD Ryzen 9 9900X delivers 12 cores and 24 threads for heavy multitasking
  • X870 chipset supports DDR5 up to 8400 MT/s when overclocked with Ryzen 9000
  • 10+2+1 power stages rated at 110 A each feed the CPU cleanly
  • WiFi 7 with 320 MHz channels reaches 6.5 Gbps peak wireless speed
  • PCIe 5.0 M.2 slot plus PCIe 4.0 M.2 slot both include substantial heatsinks

Ready for Advanced AI PCs

This motherboard and CPU combo pairs the ROG STRIX X870-I GAMING WIFI with a Ryzen 9 9900X. The board uses the AMD X870 chipset on an AM5 socket. It supports Ryzen 7000, 8000 and 9000 series processors. The CPU delivers 12 cores and 24 threads with a 5.6 GHz max boost.

Mini ITX builders and AI workloads

The Mini ITX form factor suits compact systems that need strong multi-threaded performance. Four DDR5 slots support up to 96 GB of memory. Builders who need multiple full-length expansion cards or more than two M.2 drives should look at larger boards.

Sustained load behaviour

A 10+2+1 power solution rated for 110 A per stage feeds the CPU through ProCool II connectors. Massive heatsinks with an integrated I/O cover and high-conductivity thermal pads dissipate heat. An L-shaped backplate adds structural rigidity and thermal mass for extended workloads.

How it compares

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

Price $1,032.99
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 X870-I GAMING WIFI+R9 9900X
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

5 more in the same range

Questions about this item

What DDR5 memory kit speed do I need to match the CPU's native 5600 MT/s support?

The Ryzen 9 9900X officially supports DDR5-5600; the board can run faster with overclocking but 5600 MT/s works without any tuning.

Will my existing PCIe 4.0 graphics card run at full speed in the x16 slot with this CPU?

With the Ryzen 9000 series processor the primary slot operates at PCIe 5.0 x16 and is backward compatible, so a PCIe 4.0 card will run at its native x16 speed.

How can I confirm the Wi-Fi 7 radio is active after I build the system?

In Windows 11 open Settings > Network & internet > Wi-Fi; the connection properties will show 802.11be and a 6 GHz band if the 2x2 Wi-Fi 7 adapter is working.

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