iMac Memory RAM
OWC Memory Upgrades
One of the easiest and most cost-effective ways to improve the performance of your iMac is to increase the RAM (Random Access Memory). More memory means your iMac can better handle multitasking between programs, perform faster during most day-to-day tasks, and it will also be less susceptible to spinning beachballs and crashes. If you work with large files or use memory-intensive applications, maxing out your RAM is a must.
OWC Memory — Is the highest quality Apple iMac RAM memory available in Australia: It is high performance and also rigorously in-house lab tested by OWC to ensure superior quality, perfect compatibility and reliability. We offer an Australian lifetime replacement warranty as well as 30 day no questions asked returns on all OWC Mac Memory upgrade and SSD products.
27″ iMac with Retina 5K Display (2019 - 2020)
Up to 128GB of memory
21.5″ iMac with Retina 4K Display (2019)
Up to 64GB of memory
27″ iMac with Retina 5K Display (2017)
Up to 64GB of memory
21.5″ iMac with Retina 4K & Non-Retina Display (2017)
Up to 64GB of memory
27″ iMac with Retina 5K Display (Late 2015)
Up to 64GB of memory
27″ iMac with Retina 5K Display (Late 2014 & Mid 2015)
Up to 32GB of memory
27″ iMac (2012 - 2013)
Up to 32GB of memory
21.5″ iMac (2012 - 2013)
Up to 16GB of memory
27″ & 21.5″ iMac (Mid & Late 2011)
Up to 32GB of memory
27″ & 21.5″ iMac (2010)
Up to 32GB of memory
27″ & 21.5″ iMac (Late 2009)
Up to 32GB of memory
How can I upgrade my iMac memory?
If you own a 27-inch iMac, upgrading the memory is simple and should only take about five minutes to complete. In the back of each 27-inch iMac, there is a small memory bay door that houses the memory cage. After opening this door, you can easily access and pull out the original memory and replace it with any other Apple-compatible memory modules.
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. We recommend professional installation for these models to ensure you upgrade your iMac RAM safely.
Since the debut of the Apple iMac in 1998, OWC has offered Apple-compatible memory upgrades for any Apple iMac desktop. 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. 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.
Can't find your RAM?
If you can't find the right memory for your Mac, let us know and we'll help. We also stock some genuine Apple original RAM as well as other trusted brands — just get in touch and we'll point you to the right module for your machine.
Contact UsHow to find your Mac's Model ID
Click the Apple menu → About This Mac. Your model name and year are shown there.
For the exact Model Identifier (e.g. iMac19,1), click More Info → System Report and look for Model Identifier under Hardware.
Still not sure? Email helpdesk@macfixit.com.au with your Mac's serial number and we'll confirm the right memory.