I'm not defending Nvidia but I don't see why we're putting the 8600GT against the 7600GT in the first place since it's much more like the 7600GS, and the 8600GTS is more like the 7600GT.
Except that the GF8600GT costs more than the GF7600GT, err.., even the GF7900GS and X1950GT (and some X1950Pros) so that's why they are compared. The GF8600GTS costs as much as the X1950XT so that's why they are compared. The prices start to drop and then they will return to other competition levels that they perform similar to, and that's what the point of this thread is.
You argument is fine for a technology comparison, but no one buys a card because compared to the last one it's 10% better, they buy it because for the $100-200 the spend it's the best card they can buy. You argument would be like comparing the GF8600GT to the Radeon 9600 or FX5600 because they were in the same 'category/class', and there's no way you could get anyone to agree with that.
I also wonder if they plan on adding 50 to the ends of the numbers much like ATI did with their stuff last gen for a performance boost. Much like 1650, 1550, 1950, and it's not just ATI since Nvidia made the 7950,
And it started with the FX5950.
Although I think each generation should be better than it's previous one, I think all we're really getting for our money with these cards DX10 anyway. Is DX10 material even out? NO(except a demo). Is price/performance worth it...not really.
Like I said, DX10 support is worth about $20, whereas currently nV seems to be charging about $50-100 premium on performance if you look at it that way. The only significant value over the previous generation is if you use/watch HD video features.
I gotta admit though the 8800GTS320 is quite a tasty snack.
And that wins on price/performance alone and has no need for a DX10 crutch to sell it. And that's all that it should be.
While the HD2600 is unlikely to be spectacular, if it's the same performance as the weak GF8600 series, it should learn it's lesson and not start with such a high launch price.