I ran VMware Player doing protein folding (Folding@Home) for weeks on Core i5-650 Clarkdale with 4 GB and Windows 7 Enterprise. ran fine. The threads are 80%+ the value of a real core. I am doing the same VM on Core i5-870 with heavy graphics on 2 cards and get very good results. I see no reason to go to Xeon to do virtualization. there could be other reasons, but basic VM technology on desktops works fine with adequate cycles and memory.