That's nowhere 50%..
Yea, I was wrong with 20%. It's something like 35%.
Still, a second GTX 570 would give a much bigger boost.
yeah, just make sure that your psu is capable of running 2x570..
you'll be surprised with your electricity bill...
and you have to pay attention to the stuttering issue
btw, would you like to see the website link that I gave above?
670 in certain games even reaches 100% improvement compared to the 570 ..
relative benchmark is not best way to compared performance of cards..:D
still, IMO, one powerfull card is better than 2 slow card..