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

Works as expected on my 2017 27 iMac Retina 5k. I added this to the existing 8 GB of RAM for 24GB total. Make sure to install the new RAM in the first two slots and move the existing RAM to the last two slots. I suspect leaving the existing RAM in slots 1 and 3 and filling in slots 2 and 4 with the new RAM is causing the booting issues some are describing.

Works perfectly with iMac (Retina 5K, 27-inch, 2019).

works perfect with my iMac!

Solid product. Works just as it should. Easy to install in my new iMac.

Straight forward easy upgrade that was worth the money .The benefits were immediate and noticeable in certain applications and faster all around . Highly recommend seller for fast shipping and item as described with no surprises . In summary a happy customer.

I bought a 27 iMac at Costco that only had 8GB in it. With 24GB, its now noticeably faster. These installed in about 10 minutes, no problem.

The package arrived very quickly and the RAM itself was super easy to install. In 5 minutes I upgraded from 8GB of RAM to 64GB. And saved a lot of money. Highly recommend!

Thank you for making and selling these!! Our basic but expensive Mac was getting laggy when working on large photoshop or Adobe files. We didn’t want to pay $400+ plus for an apple RAM card and we’re so happy when we found these.

I have an iMac Pro (2017, retina, 27, base memory 8GB) that I like except for the memory - its too slow, and gets jammed up if Ive opened too many programs. With great trepidation, I read the Apple specs to see what memory I should get to upgrade, found that the local shops didnt have much on hand, and decided to do it myself. The directions seemed straightforward, but this isnt my strong suit, and my hands arent particularly strong, so I didnt know if I could remove the original memory or seat the new memory. I ordered a set of two 16GB memory chips for this model, and waited until someone was around in case something went awry who might be able to assist. Apples explanation was very clear about how to add memory. I also read reviewer comments to see what problems others had encountered. The only hitch was in pushing the button to open the memory compartment - that needed more pressure from an implement other than my finger (e.g., a small screwdriver). I decided to try using the two empty slots, leaving the old 4GB chips in place, since it would still be balanced, and put the chips in (easily), closed up, put the cables back and the machine upright, and voila! It worked! my iMac is much quicker, and so far it hasnt frozen or jammed up, so Im very pleased with these chips. They have made a noticeable, welcome change, and Im not feeling like such a klutz!

Easy RAM install ... thanks