According to the technical specifications for the new iMacs, 800MHz DDR2 SDRAM is required. The upgrade cost to go from 2 GB to 4 GB via Apple is $200.00 which we all know is a bit high. OWC currently does not list memory upgrades for the new iMacs. A quick check on PriceGrabber.com revealed these product listings. It looks like the price for a 2 GB module compatible with the new iMacs should run between $45 and $50.