Laharl ex spotted this one for us:
Researchers at Symantec have discovered a proof of concept virus that targets a systems processor rather than its operating system. There are currently two versions of this virus, one targets the 32 bit version and the other targets the 64 bit version proccessors from AMD. Symantec are calling these viruses w32.bounds and w64.bounds.

Symantec found this code in online meeting places for virus writers such as underground websites and IRC chat channels.