Quote Originally Posted by Bellisimo View Post
dont forget all memory read/writes are placed on the FSB, if all data of 3 GTX280 have to placed on that same FSB, a serious bottleneck is born
i also thought the fsb isnt bidrectional, so you have to wait before you can send something in a direction

and i didnt find large gains with 4870x2 either
Huh ? GPUs don't talk to memory over FSB , they have DMA over the NB.Using DDR3 1600 , GPUs have 25.6GBs of BW ( minus what goes to the FSB ) available.