The cpu can be a bottleneck for just one card, like it is on my rig. But that is probably because this cpu wont run above 1.8 stable, otherwise I would have oc'ed it. However, all of my games run between 60 to 90 fps, so the bottleneck is not really noticable. I am satisfied with just one card, so I see no reason to have four cards running in SLi. It is cool to hear about it though.D.D. said:on a more serious note tho: how much would the CPU be bottlenecking this kinda system? iirc, even in this generation with 2 cards in sli, the cpu is often times a bottleneck no?