I want to upgrade the ram in my iMac that currently has 2GB, I want to up it to 4GB. I ran the crucial memory scanner and it gave me the appropriate ram to buy, but it's pretty expensive. I usually use that scanner to find out what ram I need, then I head over to Amazon.com to grab one there for a cheaper price. It says I have "Memory Type: DDR2 PC2-6400, DDR2 (non-ECC)" and the best choice that is guaranteed to work with my iMac is "4GB kit (2GBx2), 200-pin SODIMM, DDR2 PC2-6400 memory module" which is $60. I know I can find it cheaper on Amazon, but I couldn't find the same on there, or maybe I'm not searching deep enough. Could someone give me a link to a 4GB ram kit on Amazon that is compatible with my iMac? Thanks!