All OWC brand memory is thoroughly tested and assured to perform flawlessly with your iMac and is covered by a Lifetime Advance Replacement Warranty and a Money-Back Guarantee. To make the memory installation process as stress-free and straightforward as possible, we provide step-by-step installation videos to walk users through the upgrade process and expert technical support, who are more than happy to answer any questions you may have. Since the debut of the Apple iMac in 1998, OWC has offered Apple-compatible memory upgrades for any Apple iMac desktop.
We recommend professional installation for these models to ensure you upgrade your iMac RAM safely. If you own a 21.5-inch iMac or an iMac Pro, the memory upgrade process is more advanced and involves removing and reinstalling the iMac screen to access the memory. After opening this door, you can easily access and pull out the original memory and replace it with any other Apple-compatible memory modules. Four 4G RAM cards or four 8G RAM cards Thanks. Can I add two 8G (16G total) RAM with the two 4G (8G total) RAM already installed for a total of 24G or do I have to keep the RAM the same in all four slots i.e. In the back of each 27-inch iMac, there is a small memory bay door that houses the memory cage. I have a late 2013 27-inch iMac with 8G DDR3-SDRAM.
If you own a 27-inch iMac, upgrading the memory is simple and should only take about five minutes to complete.
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