If you want to run stock GPU and are willing to OC your i7 then at 4GHZ and up the 930 does not bottleneck ANY graphics setup at the moment. If you are looking for more performance from your GPUs with a 4GHZ i7 the only way up is to invest in cooling for your cards and clock the living shiza out of them.
if it is bottlenecked then i guess your screwed unless sandybridge is a miracle worker. cuz right now there is no cpu (including 980x) that makes any noticeable FPS difference in games clock for clock above and beyond the 4 core i7900 series. in other words, you'll be fine, you could do 3 480s if you felt like it, cpu botteneck is not an issue, it's simply your ability to cool the cpu so you can overclock it, hence overclock.net
(the cpu (any cpu running high end rigs) is a waste of time if you won't overclock it, where in retrospect the gpu's are fine at stock)
but i repeat, i have no clue why you think an i7 900 series cpu will give you a bottleneck, just do some quick googling for gtx 480 reviews and look at the cpu's they have in the sli rigs.
Well first of all, If you are going to buy two GTX 480's I don't see why you wouldn't be overclocking your cpu. Like seriously what kind of enthusiast buy's two 480's and not overclocks there cpu and second even if it's bottlenecking I doubt you will see a big difference. Seriously 2 480's for gaming lol.
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