Originally Posted by
John P. Myers
In the 680, it's a physical reduction of FP64 cores, which are then additionally crippled. Nothing can be done.
In the 400 series and 500 series i never found out how it's done for sure, but i DO know it isn't done through BIOS. So hacking that won't help at all.
It's possible it's done in the drivers. If that's true, the last driver release that wouldn't've been crippled would've been during the reign of the 200 series, however, conveniently enough, those drivers won't allow a 400 or 500 series card to work at all.