In case you didn't think it through (like I didn't), you can't vMotion guests from one type of CPU to another. And when I say type, I don't just mean AMD to Intel, I mean different models and generations. For example, you can't go from Family 6, Model 46 (2Eh) = Nehalem-EX to Family 6, Model 47 (2Fh) = Westmere-EX/E7... at least not live. It makes sense. However, there is one exception: EVC.