btw i thought cpu should be relatively irrelevant when running a virtual machine? also i cant find win 8 all links redirecting to 8.1 now
They aren't irrelevant because the vast majority of virtualization solutions use hardware virtualization instead of emulating the instruction set (it is faster and simpler). That being said, I could see them emulating the particular missing (compare and swap) instruction in this case.
EDIT: actually on second though, that might be more difficult than I was thinking at a cursory glance. It would get into flushing cache lines so nevermind.
EDIT2: I also cannot find the ISO being hosted anywhere officially. Apparently MS never had DigitalRiver host them either...