I suppose this applies to any unofficial GPU, but in my case, I'm referring to a GTX 570 (1280GB). Question: I'm wondering how you can monitor and/or control the GPU's power state on Macs not using the AGPM kernel extension (AppleGraphicsPowerManagement.kext). Example: The GTX570 is capable of running at 3 distinct power states (Gstates). Users used to be able to edit AGPM to modify when exactly to switch between Gstates 0, 1, & 2. I'm under the impression that this is no longer necessary, but in my case (MP 3,1) there was never an AGPM.kext to begin with. Why do I care? I'm afraid my GPU isn't optimally switching between power states. Comparing the MP's total power consumption between 10.8.1 & XP, XP draws more power running the same task (e.g. Unigine benchmark). Granted, it's not really the same task, and it's presumptuous to deconvolute changes in total power. But when playing a game in XP, it'll consistently be about 380-400W with smooth performance, while in OS X, it fluctuates much more, but rarely exceeds 300W. Unigine though will stay between 350-370 in OSX. Portal 2 will be at 200+ fps, but still stutter. Thanks so much!