I have a late 2009 24" iMac with a 2.93 core2 duo processor. I recently upgrade my ram to 8 gigs. I have no problems and my computer runs as it should. Recently I had a scratch your head moment. Since a 64 bit operating system can support an obscene amount of ram, what would happen if I swapped my 4 gig sticks for 8 gig sticks?