Running on a MacBook Pro (MacBookPro1,1). I've installed Windows 7 RC (build 7100), and installed the Boot Camp drivers (2.0, then updated to 2.1). Everything runs as expected, until I try to play any graphics intensive games (tried this with Civilization IV and Red Alert 3). I get the same problem under Windows Vista. About 5 minutes into the game, the machine crashes/shutdown as if it's suddenly lost power (i.e., it's fine and then *poof* it's off, with the usual sort of sound you get at the end of a shutdown). I don't have any issues like this running OS X (10.5.6), and didn't previously with installs of XP, although that was maybe a year ago. Not sure if it occurs running XP now. I've tried installing the newest drivers for the ATI X1600 from the ATI website, and changing the clock speed (read this on some forum) using ATITool, but no change. I'm really at a loss at what to try next.