I just bought a new iMac (2.8GHz). Should I leave in the 2 gig of RAM at 800 MHz that came with it, or put in a 3 gig at 667 (1gig + 2gig stick) set that I have extra just laying around? I'm thinking that it would be stupid to mix one of the faster 1gig sticks with the slower 2gig (1gig @800 + 2gig @667) because I believe that limits the faster one to 667 anyways. So, 3 running slower or 2 running faster, which is the better deal? I am not a photo/video guy. I am an engineering student. I will be using the computer for school and personal tasks (music, internet browsing, word processing, programming, simulation software) and doing virtualization with vmware. I am thinking that the capacity of the 3 gigs is more advantageous than the speed of the 2 gigs because I wont notice/care about a couple seconds and I tend to leave firefox with lots of tabs open and extensions running open most of the time as well as many other applications. I am not an expert though and possibly you know something I don't about these matters, so help me out!