I am obviously not using the correct search terms to find this info, but I want to upgrade my iMacs RAM. The system I have is a refurb 21.5 iMac with 3.06 GHz dual core processor. I want to go from the current 4Gig to 8Gig. Everytime I check the different sites for their online memory guides, I see the 3.06 Intel in the 24" but not in the 21.5. Are they the same? I just want to order the right memory the first time. Thanks in advance.