ASUS PRIME B860M-A & Intel Ultra 9 285K Combo Intel motherboard
- LGA 1851
- Intel B860
ASUS
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.
model ROG STRIX B860-I GAMING WIFI
+CPU +Ultra 9 285K
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.
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.
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.
| Brand | ASUS |
|---|---|
| Model | ROG STRIX B860-I GAMING WIFI+Ultra 9 285K |
| Part Number | ROG STRIX B860-I GAMING WIFI+Ultra 9 285K |
| CPU Socket Type | LGA 1851 |
| Chipset | Intel B860 |
| Number of Memory Slots | 2x288pin (DDR5) |
| Memory Standard | Up to 9066+MT/s (OC) |
| Maximum Memory Supported | 96GB |
| Channel Supported | Dual Channel |
| Memory Feature | Dual channel memory architecture DIMM Fit Supports Intel Extreme Memory Profile (XMP) memory module ASUS Enhanced Memory Profile III (AEMPIII) |
| PCI Express 5.0 x16 | Intel Core Ultra Processors (Series 2) 1 x PCIe 5.0 x16 slot |
| Serial ATA (SATA) | 4 x SATA 6Gb/s |
| M.2 | Intel 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 RAID | Intel Rapid Storage Technology supports SATA RAID 0/1/5/10. |
| Audio Chipset | Realtek ALC1220P |
| Audio Channels | Realtek 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 |
| Max LAN Speed | 2.5Gbps |
| Wireless LAN | Wi-Fi 802.11 be |
| Bluetooth | Bluetooth 5.4 |
| Back I/O Ports | 1 x Thunderbolt 4 port (1 x USB Type-C) 1 x USB 20Gbps port (1 x USB Type-C) 1 x USB 10Gbps ports (1 x Type-A) 3 x USB 5Gbps ports (3 x Type-A) 2 x USB 2.0 ports (2 x Type-A) 1 x DisplayPort 1 x HDMI port 1 x Wi-Fi module 1 x Intel 2.5Gb Ethernet port 2 x Audio jacks 1 x Optical S/PDIF out port 1 x Clear CMOS button |
| Onboard USB | 1 x USB 10Gbps connector (supports USB Type-C) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 1 x USB 2.0 header supports 2 additional USB 2.0 ports |
| Other Connectors | Fan and Cooling Related 1 x 4-pin CPU Fan header 1 x 4-pin AIO Pump header 1 x 4-pin Chassis Fan headers Miscellaneous 2 x Addressable Gen2 headers 1 x Front Panel Audio header (F_AUDIO) 1 x 10-1 pin Front System Panel header 1 x Thermal Sensor header |
| BIOS Feature | 256 Mb Flash ROM, UEFI AMI BIOS |
| Software | ROG Exclusive Software - ROG CPU-Z - Dolby Atmos ASUS Exclusive Software Armoury Crate - Aura Creator - Aura Sync - Fan Xpert 4 - GameFirst - Power Saving AIDA64 Extreme (60 days free trial) HWiNFO 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 ASUS EZ DIY - ASUS CrashFree BIOS 3 - ASUS EZ Flash - ASUS UEFI BIOS EZ Mode - ASUS MyHotkey NPU Boost |
| Windows 11 | Windows 11 (22H2 & later) |
| Form Factor | Mini ITX |
| Dimensions (W x L) | 6.7" x 6.7" |
| Power Pin | 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector |
| Features | Extreme Engine Digi+ - 5K Black metallic capacitors ASUS Q-Design - PCIe Slot Q-Release Slim (with PCIe SafeSlot) - M.2 Q-Latch - 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 - M.2 heatsink - VRM heatsink design ASUS EZ DIY - Clear CMOS button - CPU Socket lever protector - ProCool - Pre-mounted I/O shield - SafeSlot - SafeDIMM Aura Sync - Addressable Gen2 headers |
| Package Contents | 1 x Intel Ultra 9 285K CPU 1 x Thermal grease: Shin-Etsu X-23-7868-2D Cables 2 x SATA 6Gb/s cables Miscellaneous 1 x ASUS WiFi Q-Antenna 1 x Cable ties package 2 x Screw packages for M.2 SSD 1 x Fan Bracket 1 x ROG key chain 1 x ROG Strix stickers Documentation 1 x Quick start guide |
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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.
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.
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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