okay, i'm new here so go easy on me... haha. alright, i've got an iMac from late 2006. and i'm trying to upgrade the ram.. here's the specs... iMac intel MA589LL/A 20in 2.16 1GB ram 250 gig ect... so on the box it says upgradeable to 3 GB of ram... but the computer has two slots... which currently have a 512MB card in each of them. so my question is how do i install three gigs of ram? a 1GB card and a 2GB card? this doesn't seem to make sense, because i thought you were always supposed to keep them balanced.... so should i just install 2 - 2GB cards... for a total of 4 gigs... even though the computer will only used 3 gigs? that's what i sorta got from this page... http://support.apple.com/kb/HT1432 any help with this would be great... as i've been searching the net for hours... without a definite answer.