Hello everyone. I am considering buying some ram for my Dell in signature. So it turns out that my Dell uses the exact same type of ram as my iMac 27" i7. As far as I know, the iMac by default comes with 4 ram slots, with 2x2GB ram being used for 4GB. This means that I should have 2 slots open, right? I was considering buying 2x2gb ram sticks, which will bring my dell up to 6GB Ram(4 slots as well, 2 are slightly more difficult to get to atm,currently has 4x1GB). I could then take the extra 2x1gb and boost my iMac up to 6 GB as well. Now, the question. I went on NewEgg, and I noticed quite a few offers I could choose from, listed here. http://www.newegg.com/Product/Produ...06178 600000403&IsNodeId=1&name=4GB (2 x 2GB) Now, I have never purchased ram before. As far as I can tell, each offer has the exact same specs, but slightly different prices. By first glance, of course I would jump to the $40.99 Crucial listing. Is their a reason for different pricing? Is one package preferred over the other? Thanks Bruce Edit: On second glance, it seems the Ram in my iMac is 1333 Mhz, not the 1066. I know for a fact that the Ram in my Dell and the Late 2009 MBP are compatible with each other(and I know the MBP was 1066 Mhz). I was also under the impression that the Ram in that MBP and my iMac was also compatible. Will my iMac only support 1333 MHz, or will 1066 MHz work as well?