wow. What a bold statement. Sounds like you think the way the driver controls the card is so dumb that they can't change anything but the settings users can change already.

Hey, could you post a picture of the plug from the PSU and what brand/model the PSU was? I was reading around and it seems the PSU plug not being rated for the current could be the issue.

https://bitcointalk.org/index.php?topic=62686.msg733782#msg733782

Other posts in the thread help some. When you go past 2 cards you start to push limits on the 24 pin connector. I guess this is why so many cards use much less than 75W to be safe in multiGPU configurations, but clearly a lot of folks still end up with burnt 24 pin connectors. if your psu had the lower rating of 6A then max was 144 W for the 24pin.

actually if you clean out the 24pin connector on the motherboard, it might still work fine. One thread online had a plug burn out and the system was fine with a different PSU. Worth a try and it would isolate the problem to the PSU plug not being rated high enough