Mine's is the ClawHammer core. Wonderfully good, and has 1 mb cache too.
But my mobo uscks for OC'ing, though...the highest I could get it to be stable was 2.42ghz. But, that's my mobo's problem. The Winchester core is awesome...extremely OC able, uses the 90nm process instead of the 130nm process, and it doesn't get very hot either.