Don't Upgrade The RAM In Your New Apple iMac, Do This Instead
New 8GB 2X4GB Memory SODIMM DDR3 1066 Apple iMac Core 2 Duo 2.66 24" Early 2009
4GB Team High Performance Memory RAM Upgrade Single Stick For iMac “Core 2 Duo” 3.06 24-Inch (Early 2009) MB420LL/A iMac 9,1. The Memory Kit comes with Life Time Warranty. at Amazon.com
iMac (2009) RAM & Storage Upgrades
Apple iMac 24-inch Early 2009 - 2.66GHz Core 2 Duo Apple RAM Memory | Kingston