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Click on the apple on the upper left most corner of your screen then select about this mac the click on system report from there scroll down to memory and it will tell you how mach Ram your mac has and the type. Then just shop for that type- most will only take a max of *8GB. Good Luck
Sorry, there was a problem. Please try again later.It depends on which iMac model you have. Use this link to find the memory specifications for your iMac https://support.apple.com/en-us/HT201191
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