We are going to be running Virtual Server on a Windows Server 2003 and 6 - 10 virtual machines. For CPU, which is better if you have to trade off one for the other, faster CPU or more cores? For instance a fast 2 core or a slower 4 core. Of course I know that having fast 4 core would be better, but if you have to trade which do you trade speed or cores? Links with tests/comparisons would help along with opinions.