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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
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardDDR5 4400
  • Maximum Memory Supported96GB
  • ECC SupportedNon-ECC
  • Buffer SupportedUn-buffered

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.

Points forts

  • 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

Caractéristiques

BrandASUS
ModelROG STRIX X870-I GAMING WIFI+R9 9900X3D
ChipsetAMD X870
Number of Memory Slots4x288pin (DDR5)
Memory StandardDDR5 4400
Maximum Memory Supported96GB
ECC SupportedNon-ECC
Buffer SupportedUn-buffered
Memory Feature2 x DIMM slots, max. 96GB, DDR5
Supports up to
8400+MT/s(OC) with Ryzen™ 9000 Series Processors,
8600+MT/s(OC) with Ryzen™ 8000 Series Processors,
8000+MT/s(OC) with Ryzen™ 7000 Series Processors,
ECC and Non-ECC Un-buffered DIMM*"
Dual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO)
ASUS Enhanced Memory Profile (AEMP)
* Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory
configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site
PCI Express 5.0 x16AMD Ryzen 9000 & 7000 Series Desktop Processors
1 x PCIe 5.0 x16 slot
PCI Express 4.0 x16AMD Ryzen 8000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x8/x4 mode)
Serial ATA (SATA)2 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)
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 RAID* AMD RAIDXpert2 Technology supports both PCIe RAID 0/1/10 and SATA RAID 0/1
Max LAN Speed2.5Gbps
Wireless LANWi-Fi 7*
2x2 Wi-Fi 7 (802.11be)
Supports 2.4/5/6GHz frequency band**
Support Wi-Fi 7 320MHz bandwidth, up to 6.5Gbpstransfer rate.
*Wi-Fi features may vary depending on the operating system
For Windows 11, Wi-Fi 7 will require24H2 or later version for full functions, Windows 11 21H2/22H2/23H2 only support Wi-Fi 6E.
For Windows 10, please note that no driver is available, refer to the Wi-Fi chipset vendor's website for details.
** Wi-Fi 6GHz frequency band and bandwidth regulatory may vary between countries.
BluetoothBluetooth v5.4***
*** The Bluetooth version may vary, please refer to the Wi-Fi module manufacturer's website for the latest specifications.
USB 3.0USB4
Onboard USBUSB
1 x USB 10Gbps connector (supports USB Type-C® )
1 x USB 5Gbps header support(s) 2
additional USB 5Gbps ports
Other ConnectorsFan and Cooling Related
1 x 4-pin CPU Fan header(s)
1 x 4-pin AIO Pump header(s)
1 x 4-pin Chassis Fan header(s)
Power Related
1 x 24-pin Main Power connector
1 x 8-pin +12V CPU Power connector
Storage Related
2 x M.2 slots (Key M)
Miscellaneous
2 x Addressable Gen 2 headers
1 x 2-pin Power Button header
1 x Thermal Sensor header
2 x USB Type-C® connectors to install ROG FPS card
ROG FPS card
2 x SATA 6Gb/s ports
1 x CPU Over Voltage jumper
1 x Front Panel header
1 x Alteration PCIe Mode switch
2 x USB 2.0 headers support 3
additional USB 2.0 ports
Form FactorMini ITX
Dimensions (W x L)6.7" x 6.7"
BIOS Feature256 Mb Flash ROM, UEFI AMI BIOS
SoftwareROG Exclusive Software
- ROG CPU-Z
- Dolby Atmos
ASUS Exclusive Software
Armoury Crate
- AIDA64 (60 days free trial)
- Aura Creator
- Aura Sync
- Fan Xpert 4 (with AI Cooling II)
- GameFirst
- HWiNFO
- Power Saving
ASUS Driver Hub
ASUS GlideX
Adobe Creative Cloud (Free Trial)
Norton 360 for Gamers (60 Days Free Trial)
WinRAR (40 Days Free Trial)
UEFI BIOS
AI Overclocking Guide
ASUS EZ DIY
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
- ASUS UEFI
BIOS EZ Mode
- ASUS
MyHotkey
FlexKey
Dynamic OC Switcher
FeaturesASUS Q-Design
- M.2 Q-Latch
- PCIe Slot Q-Release Slim (with PCIe SafeSlot)
- Q-Antenna
- Q-Code
- Q-DIMM
- Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow green])
- Q-Slot
ASUS Thermal Solution
- M.2 heatsink
- Aluminum backplate
ASUS EZ DIY
- BIOS FlashBack™ button
- BIOS FlashBack™ LED
- Clear CMOS button
- ProCool II
- Pre-mounted I/O shield
- SafeSlot
- SafeDIMM
Aura Sync
- Addressable Gen 2 header(s)
ROG STRIX HIVE II
1 x USB Type-C® connects to motherboard
2 x USB 10Gbps port ( 1 x Type-A + 1 x USB Type-C®)
1 x Headphone jack with mic in
1 x Power button
1 x
Package Contents1 x AMD Ryzen 9 9900X3D CPU
Cables
1 x Panel cable
1 x ROG USB2.0 splitter cable
2 x SATA 6Gb/s cables
ROG FPS Card
1 x ROG FPS Card
ROG STRIX HIVE II
1 x ROG STRIX HIVE II
1 x USB Type-C® power connection cable
Miscellaneous
1 x ASUS WiFi Q-Antenna
1 x Cable ties package
1 x M.2 Q-Latch package(s)
1 x ROG key chain
1 x ROG Strix stickers
1 x M.2 rubber package(s)
Documentation
1 x Quick start guide

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Questions sur cet article

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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