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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 Socket TypeAM5
  • ChipsetAMD B850
  • Number of Memory Slots2x288pin (DDR5)
  • Maximum Memory Supported96GB
  • Channel SupportedDual Channel
  • ECC SupportedYes

Motherboard ROG STRIX B850-I GAMING WIFI

Struck-through versions exist but are not stocked here.

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.

Highlights

  • 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

Specifications

BrandASUS
ModelROG STRIX B850-I GAMING WIFI+R7 9800X3D
CPU Socket TypeAM5
ChipsetAMD B850
Number of Memory Slots2x288pin (DDR5)
Maximum Memory Supported96GB
Channel SupportedDual Channel
ECC SupportedYes
Buffer SupportedUn-buffered
Memory FeatureDual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO)
ASUS Enhanced Memory Profile (AEMP)
PCI Express 5.0 x16AMD Ryzen 9000 & 7000 Series Desktop Processors
1 x PCIe 5.0 x16 slot(s)
PCI Express 4.0 x16AMD Ryzen 8000 Series Desktop Processors
1 x PCIe 4.0 x16 slot(s)
Serial ATA (SATA)2 x SATA 6Gb/s
M.2AMD 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 RAIDAMD RAIDXpert2 Technology supports both PCIe RAID 0/1/10 and SATA RAID 0/1
Audio ChipsetRealtek ALC4080
Audio 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
Max LAN Speed2.5Gbps
Wireless LANWi-Fi 802.11 be
BluetoothBluetooth 5.4
Back I/O Ports1 x USB 20Gbps port(s)
5 x USB 10Gbps port(s) (4 x Type-A + 1 x USB Type-C with DP Alt mode)
2 x USB 2.0 port(s) (2 x Type-A)
1 x HDMI port
1 x Wi-Fi module
1 x Intel 2.5Gb Ethernet port
3 x Audio jacks
1 x Optical S/PDIF out port
1 x BIOS FlashBack button
1 x Clear CMOS button
1 x FlexKey button
Onboard USB1 x USB 10Gbps connector (support(s) USB Type-C)
1 x USB 5Gbps header(s) support(s) 2 additional USB 5Gbps ports
1 x USB 2.0 header(s) support(s) 4 additional USB 2.0 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)
1 x Extra Flow Fan header(s)
Miscellaneous
2 x Addressable Gen 2 header(s)
1 x CPU Over voltage jumper
1 x Front Panel Audio header (F_AUDIO)
1 x 10-1 pin Front System Panel header
1 x Thermal Sensor header
Form FactorMini ITX
Dimensions (W x L)6.7" x 6.7"
Power Pin1 x 24-pin Main Power connector
1 x 8-pin +12V CPU Power connector
BIOS Feature256 Mb Flash ROM, UEFI AMI BIOS // UEFI AMI BIOS(text-based)
SoftwareROG Exclusive Software
- ROG CPU-Z
- Dolby Atmos
ASUS Exclusive Software
Armoury Crate
- AIDA64 Extreme (60 days free trial)
- Aura Creator
- Aura Sync
- GameFirst
- HWiNFO
- Power Saving
ASUS AI Advisor
ASUS DriverHub
ASUS GlideX
TurboV Core
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
Windows 11Windows 11, Windows 10 64-bit
Windows 11 (22H2 later)
FeaturesExtreme Engine Digi+
- 5K Black metallic capacitors
ASUS Q-Design
- M.2 Q-Latch
- M.2 Q-Slide
- PCIe Slot Q-Release Slim (with PCIe SafeSlot)
- Q-Antenna
- Q-Dashboard
- Q-DIMM
- Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow green])
- Q-Slot
ASUS Thermal Solution
- M.2 heatsink backplate
- VRM heatsink design
ASUS EZ DIY
- BIOS FlashBack button
- BIOS FlashBack LED
- Clear CMOS button
- ProCool
- Pre-mounted I/O shield
- SafeSlot
- SafeDIMM
Aura Sync
- Addressable Gen 2 header(s)
Package Contents1 x AMD Ryzen 7 9800X3D CPU
Cables
1 x Panel cable
1 x ROG USB2.0 splitter cable
2 x SATA 6Gb/s cables
Miscellaneous
1 x ASUS WiFi Q-Antenna
1 x Cable ties package
1 x M.2 backplate Q-Latch package(s)
1 x M.2 Q-Slide package
1 x ROG key chain
1 x M.2 backplate rubber package(s)
1 x Screw package(s) for M.2 SSD
Documentation
1 x Quick start guide

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

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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