The Intel 945 Chipset that I assume is in the iMac supports Dual Channel Memory. I am waiting to find this out before I order some RAM for the Intel iMac I have on order. If it supports dual channel, i'll buy a couple of good 512mb sticks in a matched pair and sell the one included but if it doesn't, i'll just buy a 1GB stick and add it to the 512 to make 1.5GB. Anyone know?