Yorkfield is the code name for some Intel processors sold as Core 2 Quad and Xeon.

On November 11, 2007, Intel released the first Yorkfield XE processor, Core 2 Extreme QX9650.

It is the first Intel desktop processor to use 45 nm technology and high-k metal gates.

Yorkfield features a dual-die quad core design with two unified level-two (L2) caches of 6 MB each.

The OEM-only Xeon X33x3 processors with 80 W TDP and product code 80584 are made for LGA 771 like Harpertown but are only supported in single-socket configurations.