Can anyone assist? My work colleague has recently purchased the base i5 iMac with 4gig of RAM. He now wishes to upgrade to 8gig (seen a good deal for this from Crucial). My colleagues question is this - when he gets the RAM 2x 4gig modules he was wondering what he could do with the 4gig that's pre-installed 2x2gig. Can he simply leave it in making 12gig in total or will that not work? Even though I have the iMac and the new Mini I had to confess that I didn't know the answer but said I would ask on here.