Just curious whether p7550 cpu supports vt-x. Can you please run sysctl machdep.cpu.features from terminal to see whether vt is supported. Thanks. btw, if p7550 list vmx feature, does that mean it will have the same performance for parallels/fusion/... as P8400? If yes, what's the difference between this model and mac mini 2.26GHz (I mean CPU, that is p7550 vs. p8400)? Can one virtualize win xp in win 7? Thanks.