I'm not techie enough to understand the implications of this - although from what I've read this is what helps speed things up in the Penryns along with the better architecture, faster bus speeds etc.... My questions is will existing software need to be recompiled to make full use of the Penryn and SSE4, or will it run just fine? In partcular, I'm thinking of the 3D rendering application Maxwell. If I buy a new Mac PRO will I have to wait for a new release of the application? Any enlightenment will be greatly appreciated. Thanks.