Re: What is the PerfLevelSrc hack ?
I think the hack corresponds to the performance levels which are defined in the bios of your videocard. Nvclock can for instance show them.
I'm not sure what the value itself means but I think each digit corresponds to one performance level (I guess there are standby, 2d, 3d, throttle or something like that). And then each digit corresponds to one performance level from the bios.