The switch for the Bios 0 and 1 is not in the card, so I assume is not a reference card. Is there anyway I could unlocked?

I don't see a good work in physx calculations from the CPUs, so that's why I want a small dedicated Physx card, like a GT240, it would be possible to put a CF of 6950 with a GT240 for Physx in Windows 7?

Beside of that, is the warranty avoid if you unlock the 6950 even if it is a reference one?