Crucial RAM 64GB Kit (2x32GB) DDR4 2666 MHz CL19 Memory for Mac CT2K32G4S266M

Works Flawlessly. Easy to install.

Used on a 2017 iMac i7. No problem.

really, how do you write a 2/3/4-star review of something that either works or doesnt?

absolutely no issues with ordering, shipping (shipped to Russia via Amazon Global) and installing - put in slots where original memory was installed (2-4), boot took about 10-15 seconds with no issues, overall performance is much better with 24 gigs as there was no time the memory utilization has grown higher than 30% of max. tested on iMac 2017 (Core i5, Radeon 580, 2TB)

Worked perfect in my 2017 iMac.

Royal pain to install (not the memorys fault), but can confirm that a pair of 16GB single rank work great on my Retina 4K, 21.5-inch, 2017 iMac, not just the 27 they are advertised for, which has the nice little door on the back.

I ordered this set of 16GB x2 to upgrade my iMac 27 2017. There is a similar set from crucial that is slightly cheaper, but i chose this version because it is explicitly said to be compatible with the Mac. And indeed, after I installed it, the memory was recognized immediately, and it works together with the default 8Gb that was factory installed. Together they are reported as 40Gb of 2400Mhz memory, as expected. Yay!

Brought some life to my laptop

Been using Crucial RAM chips for years in my iMacs. Theyve never failed for me unlike the other no-name brands Apple puts in their machines which has caused me grief to say the least. Crucial is a quality brand name you can count on at a decent price. My Mac era usage goes way back to Si, Ci, Power PCs, etc. Love my Macs, but like dependable memory in them!

Using this ram kit, I upgraded my base model 2019 iMac from 8Gb of Ram to 32Gb. I like that its Mac approved ram. It was easy to install, thanks to the little door on the back of the 27 iMac. 32Gb is a good amount of Ram I believe for this system and the types of software I use. Sketch, Adobe xD, Garage Band, Safari. I can run many things at once and things run smoothly. I keep an eye on my Ram usage with iStat Menus. A nice price for the Ram compared to what Apple charges.