Intel Core Ultra 9 285K: Socket and Board Support

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LGA1851 desktop processor. It does not fit LGA1700 motherboards, even though the sockets look similar.

Verified specifications

Socket	LGA1851
Series	Core Ultra Series 2
Memory generation	DDR5

Motherboard checks

ASUS lists this exact CPU name on 1 checked motherboard support page. A BIOS value of “all” is reproduced as ASUS lists it; other values are board-specific minima. Confirm the CPU stepping and actual installed BIOS before a swap.

Board	ASUS BIOS entry	Stepping	Official source
PRIME Z890-P WIFI	all	B0	ASUS CPU list

Avoid this mistake

LGA1851 CPUs cannot be installed in LGA1700 boards. Similar external dimensions do not change Intel’s socket support statement.

Run CPU compatibility check

Explore parts after verifying the specifications

Search results can include products that do not match your exact board, revision or slot. Check the SKU and manufacturer documentation before ordering.

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Sources & verification

Manufacturer pages were checked on 2026-10-29. Recheck the current page before purchase.

ASUS PRIME Z890-P WIFI CPU support list Checked 2026-10-29
Intel Core Ultra 9 285K specifications Checked 2026-10-29
Intel LGA1851 and LGA1700 socket incompatibility Checked 2026-10-29

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