Can the voltage on the GTX280 be increased through a modded BIOS flash? I read it can be increased with nibitor, but I downloaded the latest version (4.7), and it does not let me set the "extra" voltage to anything higher than it is at by default, and the "extend voltage range" check box is grayed out for me.

I'd like to increase the voltage to, say, 1.36v. It is under water, of course. I am not willing to do a hard mod. Is it possible to do it through the bios?