How many memory slots are in the 3.06 27 incher, and how many slots are taking up on the basic setup? If there are four slots, are all four slots filled with 1gb cards? Im curious because I ordered my iMac from my job here, and I also ordered 2gb of memory, thinking I can go from 4gb to 6gb of ram. I was going to order a 4gb card, but it was 200 euros at my job. If anything, I will order a couple of more 2gb cards, but that all depends on the number of slots available/open.