This just hit my Software Update today. I didn't install it, as I don't install any updates unless they patch critical security flaws or add/fix functionality I want. But I'm curious about this. My MacBook Pro has an advertised battery life of about 7 hours and I do get about that out of the battery, but I'll take more if I can get it. So, anyone installed this yet? Check your Software Update or go here: http://support.apple.com/kb/HT5384 Not much is written about it, just that it changes the CPU power consumption. Please post any details you have about it in this thread! I'm sure a lot more people than just myself want to hear about any benefits or bugs that may be present with this update. I'm weary about updating low-level components immediately before the bugs (if any) have time to get worked out.