&#62;64-bit Intel means more performance as the cpu has more registers<p>Sometimes. First of all its a bummer Apple only sells Intel. AMD makes quality chips. 64-bit means better performance sometimes.  Usually you take a hit because of larger pointers.  LLVM can do pointer compression, it'd be interesting to know if Apple uses it widely. 64-bit really is awesome when you want to use lots of memory. Otherwise 32-bit is perfectly fine.<p>I've been a 64-bit enthusiast for quite sometime and I can pull up plenty of Gentoo posts from back in the day advocating the wonder of registers. Not all algorithms magically improve in performance when they are available unfortunately.<p>Also, no mention of my GPU argument?  I'm sure you won't say there is more performance to be had there.