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Basically a clock generator using a variable frequency oscillator -- output of the oscillator is divided down then the result is compared to a reference frequency, then output of the comparison is used to tweak the oscillator frequency up or down. Think of it as a "frequency multiplier" that lets you take a reference frequency then multiply it by a programmable amount to get the frequency you want.
you guessed it .... NVIDIA ! At least they release a full-blown (stable, supports latest opengl, proper power management, good performance, CUDA) driver instead of that CRAP AMD is giving us. The quality of the AMD driver is insulting, and they have had a lot of years to come up with a proper solution... do you actually have a computer science degree guys ?
No not yet. it still doesnt have proper power management. You can change the power profile, but that is a static change... It might be a while before proper power management is implemented. I don't expect to see it before the 3.9 or 3.10 kernel....