Problem w/ 8700M card not having DX10

I have a laptop with SLI 8700s and they seemed to work fine, up until I installed RivaTuner and overclocked them, which was some time ago. Now when I'm playin a game and try to enable DX10, it isn't available, plus the game performance seems to be less than it was previoulsy. I have heard something about these cards being recognized as 7900s instead, does anyone know how I can deal with this problem? I have tried undoing all the overclocking but that didn't work.

Thanks for any help!

Are you running XP? If so, that's your problem, as DX10 is only available on Vista.

Also, you might aswell not run in DX10, because you don't have the horsepower for it.

Well, why would you want to run it in DX10?

There's no noticable difference between DX9 and DX10 in most current games yet, and DX9 is even faster to boot.