Just a heads up. These get pretty hot. The fans can just keep it from meltdown it seems. I was using the 1.6GHz duo, and this is running about 15 degrees C hotter when maxed out. That's only when maxed, which is understandable. This should be no surprise. As long as it doesn't break down, and as long as the fans are of the quite variety (which they seems to be), it shouldn't be a problem. Now to see if I can make it shut down Note: off topic: BTW Lion is hosing a LOT of apps. Even 64 bit apps. Don't know why, but it may be a problem.