The iMac 5K uses dual channel memory, so this 2 module + 2 module approach poses no performance issue. Upgrading the RAM in all of these 20-Inch and 24-Inch iMac models is the same and quite simple, too. When a full 64GB is not needed, keep the two modules already there, but add 2 X 8GB or 2 X 16GB as follows:Ģ X 4GB + OWC 2 X 8GB => 24GB 2 X 4GB + OWC 2 X 16GB => 40GB 2 X 8GB + OWC 2 X 8GB => 32GB 2 X 8GB + OWC 2 X 16GB => 48GB So add to the memory already paid for that came with the iMac: Apple configures an 8GB iMac 5K as 2 X 4GB and a 16GB iMac 5K as 2 X 8GB, thus leaving two memory slots open. While 64GB is a smart move for a “set and forget” system for the high-end configuration, many users do not need a full 64GB.
So I use it as a compute station for multi-minute Photoshop jobs using wonderfully fast Thunderbolt networking to connect to the Mac Pro. Its main weakness is a single Thunderbolt bus with only two ports, a real headache for multiple displays and networking and storage all together (daisy chaining and one bus have real practical limits). In many respects it is superior to the fastest 2013 Mac Pro (3.3 GHz 8-core). * For the first time ever I (Lloyd) bought and am actively using an iMac 5K. Things would slow to a crawl trying to do this on a system with 16GB, and performance would be substantially impaired on a system with 32GB: only 64GB will do for this kind of usage.
#HOW TO ADD MEMORY TO IMAC 2015 INSTALL#
The 64GB OWC memory kit in my late 2015 iMac 5K* took minutes to install and has worked flawlessly. Sometimes 16 or 32 GiB memory just won’t serve. See also: iMac 5K (Late 2015) with 64GB: the Key to Professional Usage and New Apple iMac 5K 27" Supports 64GB Memory, OWC Has Kits Available and
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