honestly... you know what...
whoever considers a 6990 OR 590 wont mind 100$ more or less...
like i said before, i think having a polished off product that is quiet, cool, looks nice is more important than speed...
so what, a is 10% faster than b... but its noisier, runs hot, has worse support in games, looks worse...
get what i mean?

if i had the dough and were to choose... and both get the job done, and hey we are talking dual monster gpus here so YEAH, both easily get anything done you throw at them... then a few percentage points more or less in performance wont impress me, but whichever looks better, sounds better, is running cooler, has better support in drivers with frequent updates and good dual gpu support... thats the one im going to get...

but thats for gaming... for benching perf is all that matters, and for many perf under water or ln2 will be all that matters...
i think in the latter nvidia probably has an advantage, cause if they use dual 580 gpus and cooling and power is taken out of the equation by enthusiasts, then they should clearly beat dual 6970s...

for gaming, we will see...