Well in terms of 3Dmark scores, they "suck" and also overclockability, they REALLY REALLY "suck". Also, the fact that most games these days are now in the "the way its meant to be played" program, so they are optimised for Nvidia, makes it suck even more. Even Half life which had traditionally favored ATI cards, (as in ATI consistently scoring higher than its Nvidia counterpart), is now working together with Nvidia. At the moment I'm a Nvidia fanboy because Nvidia performs well, when Ati gets its edge back like when Nvidia was in its dark ages (the FX series), I will support them and buy their cards.
And is my comment about frequencies incorrect? So Thatguy16, you are telling me that you can reliably judge performance from just the clock speed? I was just saying that you have to look at all the factors when you decide on what card to get and that includes, real world performance and overclockability, because quite frankly most people overclock these days and given a choice between a card that outperforms another at stock speeds but no overclocking headroom and a card that is marginally behind in stock but easily thrashes the other card when overclocked, I would pick the later. That scenarios is just an extreme, it does not describe the current situation with ATI and Nvidia at the moment, Nvidia cards are as good as if not better than its ATI counterpart and when you factor in overclockability, Nvidia just streaks ahead leaving ATi eating its dust.
Nvidia does have its shortcomings, I'm not saying that its perfect, price is one. Nvidia cards are generally more expensive then its ATI equivalent, but that's also the same in the CPU market as well, with Intel and AMD. It seems that AMD/ATi wants to concentrate in the mainstream to budget range of the market, and I want high range, so that's another reason why I'm a Nvidia fanboy and proud to be one. Another shortcoming would be dual card set ups, Crossfire thrashes SLi, but I don't use a dual card set up, so that does not affect my opinion of ATi, I prefer single card set ups.
The evidence that you so crave for, mep916 is here, I have had several ATi cards myself, being 9600GT and X800GT and they were ALL worse than its Nvidia counterparts. I have benchmarked my friend's X1650 as well as X1950 pro against my 7600GT and 7900GT respectively and Nvidia thrashes both of them. That's how I know that ATi cards have a very small overclocking headroom, I have real world experience in overclock those cards. I'm not just making that up out of thin air.