your question is not relevant if you're not going to buy some archaic cpu :-p
Actually, I read that there are some cards (video capture cards in particular) that fail IO virtualization, even with a modern vt-d/vt-x capable processor, like one of the better i7s. I was just curious as to what he was running to know what level of hardware IO it supported under KVM.
I am soon going to be purchasing a couple of lab machines that will do double duty as high end MDs when I'm done with them, so I wanted to know if his were vt-x or vt-d capable. I'll likely be running Scientific Linux as the normal host OS, and have the MD's boot as virtual net-booted clients. That way, I'd always have the lab machine capabilities, if/when needed again in the future, on the fly, and even available while the MDs are being used,... without disturbing the family's use of the system.