I have to agree with this. However it would be better to say, "...despite the fact the 590 is massively down clocked compared to the GTX580 ( 607 vs 772 clocks )...".
I say this because the GTX590 possesses two GF110s, the same GPU as the GTX580, and the GTX580 in SLI is a known quantity, and we know how that configuration performs compared to the HD6990.
7 game benchmarks - only 5 comparable benchmark results because only a single GPU was used by the HD6990 on the other 2.
So 5 game benchmarks compared:
AMD = won 2, lost 2, tied 1
Nvidia = won 2, lost 2, tied 1
Looks pretty even to me tbh. With more tinkering of drivers, I'm sure both cards will do even better.
However you have to admit that AMD/ATI has done wonders to extract the performance they have out of 40nm process, considering that each of the GTX590's GPUs are 33% bigger then the HD6990's GPUs and it took nvidia that extra 33% to match AMD/ATi's performance.
I'm sure the 590 will perform better with newer drivers, just have to let it mature, and who knows, maybe they'll improve the overclocking potential as well.
Just look at the 6990 and the performance gains it got with 11.4.
Edited by 2010rig - 3/24/11 at 8:42pm