I'm trying the Windows 7 64-bit Beta on my mac pro and it works really well but for some reason I have a low Windows Experience index of 5.4. Here are the scores: Processors: 7.7 Memory(RAM): 5.5 Graphics: 7.9 Gaming Graphics: 6.0 Primary Hard Disk: 5.4 * The lowest score of 5.4 is what brought down the system rating. It's probably because it's an old HD I took out of my Dell Dimension 8400 PC which dates back from 2004. I love my Mac Pro but if Apple delivers some new totally spectacular one .... Anyways please post your scores ONLY FOR MAC PROS!!!