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ASUS PRIME B860M-K motherboard with Intel Ultra 9 285K CPU and thermal grease tube

ASUS

ASUS PRIME B860M-K Motherboard & Intel Ultra 9 285K CPU Combo

SKU CH-EVMP-B3DMT

Combo with Intel Ultra 9 285K CPU, LGA 1851 mATX board, DDR5-7600, dual M.2 PCIe 5.0 and 4.0, 2.5Gb Ethernet, USB 10Gbps, Aura Sync RGB, Shin-Etsu thermal grease

  • CPU Socket TypeLGA 1851

model PRIME B860M-K

+CPU +Ultra 9 285K

  • Ready-to-build combo with motherboard, CPU and Shin-Etsu X-23-7868-2D thermal grease included
  • PRIME B860M-K board with LGA 1851 socket and 6+1+1+1 phase digital power with ProCool 8-pin
  • DDR5-7600+(OC) via AEMP III for high-speed memory performance
  • Dual M.2 slots at PCIe 5.0 x4 (128 Gbps) and PCIe 4.0 x4 (64 Gbps) for fast storage
  • Realtek 2.5 Gb Ethernet, front USB 5 Gbps Type-C and rear USB 10 Gbps Type-A for quick connectivity

Combo Contents

This bundle pairs an ASUS PRIME B860M-K motherboard with an Intel Core Ultra 9 285K processor and a tube of Shin-Etsu X-23-7868-2D thermal paste. The board uses the LGA 1851 socket and the mATX form factor. The CPU is a 125 W part built on a 3 nm process with 36 MB of L3 cache and 40 MB of L2 cache. Integrated Intel graphics are included on the processor die.

Target Builder

The package suits anyone who wants a matched motherboard and CPU without selecting components separately. Enthusiasts who already own a compatible cooler and DDR5 memory can assemble a system quickly. Buyers needing a smaller ITX board, a different socket, or a lower-power processor should consider other options.

Deciding Specification

The LGA 1851 socket is the single detail that determines compatibility. Your cooler must mount on this socket and your memory must be DDR5. The board provides one PCIe 5.0 x4 M.2 slot and one PCIe 4.0 x4 M.2 slot for storage. A 2.5 Gb Ethernet port, a front USB 5 Gbps Type-C header and a rear USB 10 Gbps Type-A port handle connectivity.

Highlights

  • Ready-to-build combo with motherboard, CPU and Shin-Etsu X-23-7868-2D thermal grease included
  • PRIME B860M-K board with LGA 1851 socket and 6+1+1+1 phase digital power with ProCool 8-pin
  • DDR5-7600+(OC) via AEMP III for high-speed memory performance
  • Dual M.2 slots at PCIe 5.0 x4 (128 Gbps) and PCIe 4.0 x4 (64 Gbps) for fast storage
  • Realtek 2.5 Gb Ethernet, front USB 5 Gbps Type-C and rear USB 10 Gbps Type-A for quick connectivity

Specifications

BrandASUS
ModelPRIME B860M-K+Ultra 9 285K
CPU Socket TypeLGA 1851

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 included Shin-Etsu thermal grease cover the full surface of the Ultra 9 285K heat spreader?

The grease tube is sized for standard desktop CPUs and its 6.2 W/m·k conductivity handles the 125 W processor; apply a pea-sized dot and the cooler pressure will spread it evenly.

Does the motherboard supply enough power phases for the 125 W CPU without throttling?

The 6+1+1+1 digital phase design with an 8-pin ProCool connector is built for 125 W class processors and includes Digi+ VRM tuning for stable delivery.

Can I run DDR5-7600 memory on this board without manual voltage tweaks?

Yes — ASUS Enhanced Memory Profile III (AEMP III) automatically configures supported DDR5 modules to 7600 MT/s with stability enhancements.

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