Originally Posted by Alatar
That's not how percentages work
In the first graph the 680 is around 20% faster than a 580 and in the second one it's about 32% faster. You're comparing it to the 580 when you say faster than a 580.
Originally Posted by Bruennis Warning: Spoiler! (Click to show)
Realistically, I think so too. ~15% at release and around 20-30% once drivers have matured. 680 at release was about ~15% faster than the 580.
With driver optimizations over the course of this year, a reference 680 is now about ~25% faster than a reference 580.
I find 15% hard to believe.
If you see this chart, the 7950s at 1150/1700 are more than 20% faster than the GTX 680s in some games (eyefinity resolution). I know this chart is kind of biased since it includes AMD games to increase the gap further between the two cards but still if the GTX 780 is only 15-20% faster than GTX 680 it will still lose to the HD7950s which is hard to believe. Nvidia will lose a lot of the trust of their customer base if they do so.
Don't forget Nvidia is not targeting only the GTX 680 of this generation. They are aiming to defeat the HD7970 GE (fastest current single card) and that is already 10-15% better at higher resolution . So 40-55% increase in some games is not that hard to believe especially with resolution increase.
If they didn't reach their expectations with GK114 as a high-end part, they can easily use GK110 and eliminate or easily keep up with the competition