[luau] CPU states in top?

[Charles Lockhart]

I just got a 1u rack mount dual Xeon system from these guys:
http://www.swt.com/thin4.html

I was looking at top and noticed that it lists 4 CPU states, where I'd 
generally figure there'd be one per CPU.  Any ideas why this would be? 
I opened it up to be sure, and yep, there's only 2 CPUs.

Thanks,

-Charles