Quote Originally Posted by Monstru View Post
Please believed me that I had the EXACT same feeling when I was reading the documentation and I noticed that the bus width is not there. Also, if you think that there is no GPU-Z out there capable of reading the specs correctly, you might get a "fishy" image about all this. So I also gave this a lot of thinking today, but I strongly think that the bus is 2 x 256 bit, due to the bandwidth that they show in the specs. However, the fact that a card which has a key selling point in working with 3 2560x1600 monitors, but however performs slower exactly in that resolution is at least...ironic
Luckily for ATI, the performance in 1920 and 1680 compensates for the behaviour in 2560 in some games, and most of the gamers do not own a 30" monitor yet.
What I am more interested in knowing is what is holding it back. Especially versus a HD 5850 Crossfire setup. Another possibility is memory timings but I am just brainstorming here.

1920 and 1680 resolutions are besides the point here since performance will be CPU limited even at 4 / 8x AA in literally every game. Trust me, with a 4Ghz i7, the graphs look pretty darn flat...