Lately in my favorite pub:

...ever heard of cpu with virus protection ?
Eh?
...AMD has it for Microsoft® Windows® XP SP2 ...
Aha.

An hour later i looked it up on google...

first the Vendors blog found here

hrmm..interesting....

a few searches later....

this

well i thought i'd paste that here and leave it up to you to make up your own minds or even try on a dedicated engine and find it all out yourself...