Quick question - my 27" iMac i5 purchased early 2010 came with 4 gigs of RAM, 2 gigs in each top slot. I'm replacing those with two 4 gig modules, for a total of 8 gigs. Just realized I seem to have 4 RAM slots in this sucker. Can I move the original modules down to the bottom two slots and end up with 12 gigs total, or do I need to be matched across the board, or will that otherwise mess things up?
Thanks
Greg