LOL, you hate nVidia but your name is SLIpro

Admittedly nvidia fans have even more to be angry about. The gtx580 isn't really a generation worthy improvement on the gtx480. It's just got the Shaders enabled a slight clock boost and they whacked on a big cooler. It's a gtx485.
Also, even if the hd6970 only turns out to be just as fast, that means nvidia have lost their performance advantage, one that they've had for about 5 years. Without that, they have nothing, their cards are hotter, hungrier and more expensive, but that was offset by 10% more performance. Without that, they're just garbage.
Roll on the gtx7 series and keplar.
The GTX 580 is considerably more powerful in benchmarks, showing 35% more performance... that's admirable considering the card uses less power, produces less heat, but still performs better.
Additionally, Nvidia hasn't had a performance advantage since the 4000 series came out from ATI.