HT201541: Update the software on your Mac
Learn about Update the software on your Mac
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Helpful answers
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Sep 6, 2016 6:21 PM in response to ratman932by Phil0124,2 highly recommended vendors for Mac Ram are OWC and Crucial
Both have tools to help you identify the Ram you need for your specific model of Mac.
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Sep 6, 2016 8:52 PM in response to ratman932by Eric Root,The 2 places I’ve seen recommended most to buy reliable RAM are below. I have purchased RAM several times from Other World Computing and have always been very satisfied with the product and service. They have on-line instructions on how to replace the RAM. OWC has also tested RAM above what Apple states is the maximum. I now have 6GB installed on an early 2008 iMac supposedly limited to 4 GB and noticed an improvement.
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Sep 6, 2016 10:52 PM in response to ratman932by babowa,Be aware that, even with 4 or 6 GB of RAM, your computer still has a slower, older processor and El Capitan runs best on newer hardware. Considering that your iMac is about 9 years old, you might want to consider saving towards a newer model.