My iMac was low on memory and was very slow. I called Apple and the tech was great and suggested I go online and buy 8GB of RAM and upgrade from 4GB. Doesn't matter! I put off this setup for a few years because I didn't want to spend "a bunch of change" on a "solution", but after speaking to Apple I didn't realize how cheap it was to add more RAM to buy. Apple sent me installation instructions, but I didn't really need them since OWC offers the same thing. Installation and recovery took only a few minutes. Now my iMac (Mid 2011, 21.5") works better! OWC seems to have the best deal compared to "famous brands" and so far so good! Thanks OWK!
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