I've been running Starcraft 2 on my 17" 2.66 i7 and I've been playing around with different graphics settings. I can run a solid mix of "high" and "ultra" settings without losing my frame rate, but if I do that my fans blow at max the whole time. Alternatively, I can run at a mix of low/medium settings with only shaders set to "high" and run the game without my fans going above 2500 rpm. Over the course of the lifetime of this MBP, I'll probably end up clocking over 1000 hours of gaming... and part of me feels like I'm burning out my computer when I let it go for hours on end with the fans raging away at full speed. The fan noise itself doesn't really bother me, I use headphones anyways.... I just feel like I'm hurting my computer but part of me also feels like that's ridiculous. So bearing in mind that we are talking about thousands of hours of gaming over the lifetime of the computer... it is okay to let it work that hard all the time or is there something to be said for keeping the system load low?