FLG_Poncho - you probably know the answer to this (and hopefully aren't under NDA for this SPECIFIC question).

Is macro-Ops Fusion enabled for 64-bit in the Penryn series?

This was one of the significant drawbacks for Conroe/Kentsfield. When you went from 32 to 64-bit code there was a decent drop in performance b/c this wasn't available.

TIA