BWHAHAHA!
Oh wait, this wasn't a post by the Onion..
Here's WHY a GPU virus is nothing to get worried about.
1. Its gone after a reboot, that's right, any sort of virus written for the GPU would be completely wiped at reboot, if not, it would have to be stored on the HD just like a regular virus, thus making it just as detectable as any other virus.
2. GPGPU's are non-standard. A virus for Nvidia cards won't run on AMD cards.
3. It still has to be execute by the OS, loaded into the GPU by the OS, and the GPU is still going to have to communicate with the OS again to do any sort of damage (Unless the virus only wants to put a bunny in the right corner of the screen). Either way, the virus MUST interact in the OS with every single step that it is doing. That makes the virus EXTREMELY OS dependent.
4. What do you gain from writing a GPU virus? It was harder to write then a regular virus... Yep, that's about it.
Whoever voiced this FUD needs to get a clue.