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ASUS PRIME B860M-A micro-ATX board with Intel Ultra 9 285K CPU and thermal paste tube

ASUS

ASUS PRIME B860M-A & Intel Ultra 9 285K Combo Intel motherboard

SKU CH-PTXT-7SJJR

A motherboard and processor bundle with thermal paste, built on the Intel B860 chipset for LGA 1851 CPUs, offering DDR5 support, PCIe 5.0 graphics and storage slots, a rear 20Gbps USB-C port.

  • CPU Socket TypeLGA 1851
  • ChipsetIntel B860

model PRIME B860M-A

+CPU +Ultra 9 285K

  • Combo includes motherboard, CPU and Shin-Etsu thermal paste for immediate build start
  • B860 chipset on LGA 1851 socket supports Intel Core Ultra processors
  • 80A DrMOS VRM stages with ProCool 8-pin deliver stable 125W CPU power
  • Dual M.2 slots plus PCIe 5.0 x16 SafeSlot enable high-speed storage and graphics
  • Rear USB 20Gbps Type-C and 2.5Gb Ethernet provide fast connectivity out of the box

Combo Contents

This bundle pairs the ASUS PRIME B860M-A motherboard with the Intel Core Ultra 9 285K processor and a tube of Shin-Etsu X-23-7868-2D thermal grease. It targets builders who want a matched platform and paste in one purchase. The board uses the Intel B860 chipset and an LGA 1851 socket. The CPU is a 125W Arrow Lake part with 36MB L3 cache and 40MB L2 cache.

Memory And Storage Headroom

AEMP 3.0 on the motherboard unlocks DDR5 speeds beyond 7600 MT/s while DIMM FIT helps keep overclocks stable. Two M.2 slots are provided: one wired for PCIe 5.0 x4 at 128Gbps and one for PCIe 4.0 x4. The primary PCIe 5.0 x16 SafeSlot handles current graphics cards. Four 80A DrMOS stages plus an 8-pin ProCool connector feed the CPU.

Included Paste And Connectivity

The bundled Shin-Etsu grease has a thermal conductivity of 6.2 W/m·k and a resistance of 0.07 °C·cm²/W, with a gray colour and 100 Pa·s viscosity for easy application. A suggested replacement cycle is two years. The rear I/O includes a USB 20Gbps Type-C port and a Realtek 2.5Gb Ethernet jack. Three Gen2 ARGB headers support Aura Sync lighting.

Highlights

  • Combo includes motherboard, CPU and Shin-Etsu thermal paste for immediate build start
  • B860 chipset on LGA 1851 socket supports Intel Core Ultra processors
  • 80A DrMOS VRM stages with ProCool 8-pin deliver stable 125W CPU power
  • Dual M.2 slots plus PCIe 5.0 x16 SafeSlot enable high-speed storage and graphics
  • Rear USB 20Gbps Type-C and 2.5Gb Ethernet provide fast connectivity out of the box

Specifications

BrandASUS
ModelPRIME B860M-A+Ultra 9 285K
CPU Socket TypeLGA 1851
ChipsetIntel B860

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Questions about this item

Will the LGA 1851 socket on this board accept my existing LGA 1700 CPU cooler?

The combo uses the LGA 1851 socket; cooler mounting compatibility with older LGA 1700 hardware is not confirmed by the supplied data.

How can I verify the Ultra 9 285K is running at its 125W base power after assembly?

Enter the BIOS and confirm the processor reads 125W base power with 36MB L3 and 40MB L2 cache showing.

Does the box include a CPU cooler or only the Shin-Etsu X-23-7868-2D thermal grease?

The combo supplies the motherboard, the Ultra 9 285K processor, and the Shin-Etsu X-23-7868-2D grease; a cooler is not included.

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