Can some one prove me wrong, ok i had the Asrock Z68 Extreme4 to start with and 2x 6970's, found this was stable running eyefinity but i needed more fps in some games, my next upgrade was the Extreme7 with the nf200 chip so i could run trifire 3x 6970's but i have never been able to get most games to run smooth with 3x cards and eyefinity all i ever got was massive fps drops less than running on 2 cards, also lots of mouse to screen lag, so much you couldn't play the games..BF3 BC2 etc, anyway i had an idea to get a single 6990 and 6970 so i;m only useing 2 pcie lanes hoping this would fix it but no, it did the same! i have done so much testing with the 2 boards but just cant get it to run smooth with 3 cards, replaced all the main parts but nothing would do it drivers etc, Anyway my final idea was to try a p67 board, so i got a MSI GD-55 replaced this for the Extreme7 without any change in OS as it had the Asrock drivers still, just needed to install the MSI drivers it needed, so then i went to try the normal games with tri 6990/6970 and it bloody worked after NO JOKE 4 months of testing and i put a p67 chip board in and it's fixed????? So i think the z68 chip with its ability to use the onboard gpu must give the pcie lanes a problem.. no idea what but from what i have done im 99% sure. just for ref the tri and even quad fire would work fine on a single dispaly with z68 chip smooth etc.. Anyway it's fixed and im 1k lighter for trying all this but will just need to sell the z68 boards etc. 
on my mobile so it maybe hard to read lol
on my mobile so it maybe hard to read lol
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