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Square Mini-ITX board in dark grey with integrated I/O shield, CPU socket cover on, thermal grease syringe alongside

ASUS

ASUS ROG STRIX B860-I Gaming WiFi Intel Motherboard & Ultra 9 285K CPU Combo

SKU CH-EPE8-1RASZ

A Mini-ITX LGA 1851 motherboard paired with an Intel Ultra 9 285K CPU and Shin-Etsu thermal grease, delivering 96 GB DDR5 memory support, WiFi7, 2.5 Gbps LAN.

  • CPU socketLGA 1851
  • ChipsetIntel B860
  • Form factorMini ITX
  • Memory slot count2 × 288pin (DDR5)
  • Supported memoryUp to 9066+MT/s (OC)
  • Max supported RAM96 GB

Model ROG STRIX B860-I GAMING WIFI

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CPU +Ultra 9 285K

  • Ready for Intel Core Ultra Series 2 processors via LGA 1851 socket
  • 10+1+2+1 80A power stages with ProCool connectors and MicroFine alloy chokes
  • Dual DDR5 slots up to 9066 MT/s supporting 96GB maximum capacity
  • PCIe 5.0 x16 slot plus two M.2 slots (2280/2260/2242) with heatsink cooling
  • 5G LAN, WiFi7, Bluetooth 5.4 and Thunderbolt 4 on rear I/O

Combo contents

The bundle pairs an ASUS ROG STRIX B860-I GAMING WIFI motherboard with an Intel Core Ultra 9 285K processor and Shin-Etsu X-23-7868-2D thermal grease. The board uses the Intel B860 chipset and LGA 1851 socket in a Mini-ITX form factor. It targets builders who want a compact platform ready for AI workloads and high-speed memory.

Thermals and power

The motherboard employs a 10+1+2+1 stage VRM rated at 80 A per stage with ProCool connectors, MicroFine alloy chokes and metallic capacitors. Cooling relies on massive heatsinks, an integrated I/O cover, high-conductivity thermal pads and an L-shaped heatpipe. The CPU has a 125 W base power rating and no cooler is included in the box.

Sustained load behaviour

Under continuous load the VRM heatsink array and heatpipe spread heat across the I/O cover to maintain stable delivery to the 285K. Two M.2 slots are provided: one PCIe 5.0 x4 with a large heatsink and one PCIe 4.0 x4 for additional storage. DDR5 memory can reach 9066 MT/s (OC) in dual-channel mode up to 96 GB.

How it compares

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

Price $1,069.99
Pricier than about 93% of the 2,965 comparable items (median $97.99).

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Specifications

Product
Brand nameASUS
Model nameROG STRIX B860-I GAMING WIFI+Ultra 9 285K
Part numberROG STRIX B860-I GAMING WIFI+Ultra 9 285K
Processor
CPU socketLGA 1851
ChipsetIntel B860
Memory
Memory slot count2 × 288pin (DDR5)
Supported memoryUp to 9066+MT/s (OC)
Max supported RAM96 GB
Memory channelsDual Channel
Storage
SATA ports4 x SATA 6Gb/s
M.2 slotsIntel Core Ultra Processors (Series 2)
M.2_1 slot (Key M), type 2260/2280 (supports PCIe 5.0 x4 mode)
Intel B860 Chipset**
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
SATA and RAID supportIntel Rapid Storage Technology supports SATA RAID 0/1/5/10.
Audio & video
Audio chipRealtek ALC1220P
Sound channelsRealtek ALC1220P 7.1 Surround Sound High Definition Audio CODEC*
- Impedance sense for front and rear headphone outputs
- Internal audio Amplifier to enhance the highest quality sound for headphone and speakers
- Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
- High quality 120 dB SNR stereo playback output and 113 dB SNR recording input (Line-in)
- Supports up to 32-Bit/192 kHz playback*
Audio Features
- SupremeFX Shielding Technology
- Savitech SV3H712 AMP
- Rear optical S/PDIF out port
- Premium audio capacitors
- Dedicated audio PCB layers
* Due to limitati
Connectivity
Maximum network speed2.5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
PCIe 5.0 x16 slotsIntel Core Ultra Processors (Series 2)
1 x PCIe 5.0 x16 slot
Onboard USB headers1 x USB 10 Gbit/s connector (supports USB Type-C)
1 x USB 5 Gbit/s header supports 2 additional USB 5 Gbit/s ports
1 x USB 2.0 header supports 2 additional USB 2.0 ports
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 support(22H2 & later)
More details
BIOS256 Mb Flash ROM, UEFI AMI BIOS

Other versions of this model

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Questions about this item

How do I install the LGA 1851 CPU into the socket without bending pins?

Align the triangle marker on the Intel Ultra 9 285K with the socket corner, lower it gently without force, then secure the retention lever; the included Shin-Etsu X-23-7868-2D grease goes on the heatspreader after the CPU is seated.

What component will need replacement first during long-term use?

The Shin-Etsu X-23-7868-2D thermal compound between the Ultra 9 285K and your cooler should be reapplied every few years as it dries out and loses conductivity.

Which limit appears first when the VRM runs under sustained 125 W loads?

The 10+1+2+1 phase VRM with 80 A power stages is rated for the Ultra 9 285K’s 125 W base power, so VRM temperature becomes the limiting factor before current capacity does.

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