I'm going to upgrade the RAM from 2gigs to 4gigs this week. I'll be putting in DDR3 (PC-8500) type ram which will run hot at 1066mhz speeds. Many of you recommended to get the RAM from Crucial. Do you know what brand of RAM Apple uses? My main concern is that whatever RAM Apple uses produces very little heat. I don't want to put in RAM that will cause the whole laptop to overheat so I'd rather go with the brand Apple is using. Also, to test the RAM, I'd normally use memtest and run it for about 20 mins. Do you recommend something else? Maybe Apple's own mem test software? If so, where can I find it? Also, is 4gigs the maximum ram for the unibody macbook pro? I read some posts that said 8gigs is supported.