AMD 64 doesn't have hyperthreading though since its a Intel design. It has Hyper Transport technology, but thats a totally different thing (HT and HT lol)
Bit weird that though. Its only using a virtual CPU when thats running isn't it? How could it cause vunerabilities in that case? Does the CPU have more control over that than i thought?
I do think this is a bit extreme though from the first link:
"Administrators of multi-user systems are strongly advised to take action to disable Hyper-Threading immediately; single-user systems (i.e., desktop computers) are not affected."
Wouldn't stealing an RSA private key only be useful if the guy hacking or something got hold of your computer itself?
I would advise that if you do have a multi computer like that and your not a big business, and you of course had standard protection like a firewall, you'd be fine