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#11
It's possible for compute tasks by just having 4 of them in your PC, but you can't SLI them together yet.
Like this monster here with 8x 9800GX2 cards MIT grads build PC with 16 GPUs - SlashGear
Pic Related...
I don't think PSU's have advanced far enough (for the public) to support more than 3.
Although I'm guessing alot of peoples basements on this forums are no where near classified as "The public"
Yet on a completely unrelated note.
Voodoo 5 - Wikipedia, the free encyclopedia
Scroll on down to The Voodoo 5 6000 AGP
I suppose external PSU's arn't all that bad, it could infact result in the ability to have more than 3 Dual GPU cards, if done right, and without cheesy alliteration.