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ASUS ROG STRIX B860-G mATX motherboard with Intel Ultra 9 285K CPU and thermal grease tube

ASUS

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

SKU CH-0A3W-DBXMW

Bundles an Intel B860 LGA 1851 mATX motherboard with a 125 W Ultra 9 285K CPU and Shin-Etsu thermal paste

  • CPU Socket TypeLGA 1851

model ROG STRIX B860-G GAMING WIFI S

+CPU +Ultra 9 285K

  • Ready-to-build combo includes CPU, board and Shin-Etsu X-23-7868-2D paste
  • Intel Core Ultra 9 285K delivers 36 MB L3 plus 40 MB L2 cache
  • 12+2+1 phase VRM rated at 70 A per phase for stable overclocking
  • Four DDR5 slots with AEMP II plus PCIe 5.0 x16 and M.2 at 128 Gbps
  • WiFi 6E and 2.5 Gb LAN with rear USB 20 Gbps Type-C and front USB 10 Gbps header

Combo Contents

This bundle pairs the ROG STRIX B860-G GAMING WIFI S motherboard with the Intel Core Ultra 9 285K processor and a tube of Shin-Etsu X-23-7868-2D thermal grease. The board uses the LGA 1851 socket and an mATX form factor. It targets builders who want a ready-matched platform for gaming and heavy multitasking without selecting parts separately. The included paste simplifies the first installation.

Thermals and Power

The CPU has a 125W base power rating and ships without a cooler, so the builder must supply adequate cooling. The motherboard provides a 12+2+1 phase VRM using 70A power stages, alloy chokes and durable capacitors to deliver stable voltage. The Shin-Etsu paste offers 6.2 W/m.k conductivity and 0.07 °C*cm^2/W resistance for efficient heat transfer. Rear I/O includes WiFi 6E and 2.5Gb LAN for modern connectivity.

Sustained Load Behaviour

Under prolonged workloads the 12+2+1 phase VRM maintains consistent current delivery through its 70A stages and premium capacitors. The board includes M.2 heatsinks and a PCIe 5.0 M.2 slot rated at 128Gbps to keep storage temperatures in check during extended transfers. Four DDR5 slots with AEMP II support allow memory tuning that remains stable over long sessions. Aura Sync RGB headers stay responsive throughout.

Highlights

  • Ready-to-build combo includes CPU, board and Shin-Etsu X-23-7868-2D paste
  • Intel Core Ultra 9 285K delivers 36 MB L3 plus 40 MB L2 cache
  • 12+2+1 phase VRM rated at 70 A per phase for stable overclocking
  • Four DDR5 slots with AEMP II plus PCIe 5.0 x16 and M.2 at 128 Gbps
  • WiFi 6E and 2.5 Gb LAN with rear USB 20 Gbps Type-C and front USB 10 Gbps header

Specifications

BrandASUS
ModelROG STRIX B860-G GAMING WIFI S+Ultra 9 285K
CPU Socket TypeLGA 1851

Other versions of this model

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Questions about this item

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

The Shin-Etsu X-23-7868-2D paste is rated as easy to apply and its 6.2 W/m.k conductivity is designed for large desktop CPUs; a pea-sized dot spreads adequately under the 285K integrated heatspreader.

Does the motherboard support DDR5 memory speeds beyond the standard JEDEC baseline?

The board includes AEMP II technology that optimises DDR5 modules above base frequency without manual tuning.

Can the 2.5 Gb LAN and WiFi 6E operate simultaneously for separate traffic streams?

Yes, the wired 2.5 Gb Ethernet controller and WiFi 6E radio are independent interfaces and can handle different network loads at the same time.

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