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

good price good experiance!

I bought Crucial 32GB Kit (16GBx2) DDR4 2666 for my iMac Retina 5K 2019, removed original ram and placed 3 sticks. first thing what I mentioned boot speed slowed down, I tried to replace to another slots but result is the same.

This worked perfectly with the 2017 5K iMac. Plug n play!

Easy to install. Fair price. Has worked fine on my 27 iMac since purchasing.

I got a lot of problems with this computer since i installed those 2 sticks. Computer is frozing all the time and have to restart manually

I installed this kit (16kb X 2) in iMac/18,3/ 27/i5/3.5kHZ; it took about 5 mins. I placed them in the two empty slots (2&4) and they were recognized immediately. A few days later I switched the new modules with the original ones just to see if there was a difference. I did not use any software to analyze the speed changes if there were any; I could not detect any difference. So, bottom line: new modules are in slots 1&3 (counting from the bottom) and original modules are in slots 2&4 and all is well.

Works fine in iMac 27 2020

Fits and Works - No Hassle. Upgrade memory - 27 2017 IMAC.

Just purchased this for my 27 5k iMac. It took 2 minutes to install and began working instantly. The computer recognized the added memory right away. If anyone was on the fence about doing it themselves or was afraid it wont work with their computer, I can attest it worked perfectly for me!

For as long as we will be able to upgrade our Mac computers, this is the BEST.