Crucial 32GB DDR4 RAM 2666MHz CL19 Laptop Memory for Mac-based systems, SODIMM 260-Pin, CT32G4S266M

I was a bit concerned prior to installing my 32 GB kit - the reviews I read here, made it seem like I would encounter issues with slot placement and seating the cards. I'm a mom of two and I'm moderately tech-savvy (I've installed an SSD drive in my previous iMac without issue), but I'm in no way an Apple Genius.The entire process actually took me about 15 minutes (to be honest, 10 minutes of that was just unplugging everything and setting-up a clear/soft workspace on which to set the computer). After popping the cover off the back of the machine, I didn't change the position of the original RAM cards- I just added the two new 16 GB cards to the remaining/available slots- I didn't have a problem seating the cards at all. Then I replaced the cover, plugs and powered my machine on- there was an initialization prior to my log-in screen that was a tad bit longer than usual, but once I signed in, everything seemed in order- "About this Mac" reflected that I had 40 GB of RAM and the application I use to monitor my RAM usage had shown an impressive increase. Prior to installing this RAM- my available RAM would hover around a paltry 25 MB (I use Adobe applications, like Photoshop, Lightroom, Illustrator and InDesign regularly), but after installing the upgraded RAM- I'm showing at least 30 GB of available RAM.For the price and ease of installation- I can't give a better endorsement. If you're on the fence about buying it, I can honestly say I'm extremely happy with this product!

As always, Crucial is the best all around brand for Apple's (upgradable) computers. Crucial is owned by Micron, a company that Apple themselves uses as an OEM supplier. If you've ever pulled RAM out of a Mac before, you might have seen "Micron" on the labels. Crucial supplies their own branded components that you'd never see inside as OEM on a Mac, but the RAM itself is Micron underneath the Crucial label. It's the brand I always trust most with RAM upgrades on a Mac. It's not the cheapest, and is far from the most expensive. But it is the most dependable. And trust me, you want dependability if you're going to go through the hassle of upgrading the memory on a 2019 iMac.That said, installing RAM on a 2019 21.5" iMac is no easy task, at least not for the faint of heart. You'll also need to order yourself new display adhesive as you cannot reuse what was on the machine. I'd also advise that if you're going to go in, to also upgrade anything else that needs upgrading (SSD, adding a second drive, CPU, etc). Because it's not easy or fun in there, it's just nice to knock it all out of the park if you can.Also make sure you have your Torx screwdrivers ready as you'll need T5, T6, T8, T9 and T10 sizes, in addition to a P00/P000 screwdriver. Make sure the screwdrivers come magnetized, and if not get yourself a driver magnetizer/demagnetizer. It's quite the journey in there, which you should look into over at ifixit.com before you order a single thing.

Followed direction and review comments. Work fine upgraded IMac late 2017 to 40 Mg.

I purchased the entry level iMac offered by Apple back in late 2017. Since I have so many programs running at the same time; I decided to upgrade to 64GB of RAM. While this is obviously overkill right now; I decided to go forward, as I didn't want to upgrade twice.It's extremely easy to remove & install memory. Just be careful to lay your computer screen on a soft surface, so as not to scratch it. The entire process takes just a few minutes. Also, if purchasing a new iMac, get it with the minimum amount of memory, then upgrade by purchasing additional memory online. Apple charges a ridiculous of amount of money for RAM; you can get it for much, much less online and install it yourself.Finally, through past experience, I've found that Crucial makes the most trouble free memory upgrades. I've purchased their kits for other computers, and have never had a problem.

Crucial delivers a great quality for price stick of RAM. I watched a video on how to open up my Dell G15 prior to installation, so I knew what I was in for. It was easy to add in my model. The stick popped right in and the bios and OS recognized the new RAM immediately upon reboot.

Compatible with my 2017 27in Retina iMac. The speed was immediately noticeable. My music software is handled and simple programs like the Finder and the internet don’t take forever to start up anymore. Also I can begin opening applications much sooner after the initial login. When I put the new cards in I took the old ones out and my iMac wouldn’t boot. I put the old ones back in with the new ones still inserted and it booted fine. It took a while to boot the first time but after the first boot every boot after was regular (I didn’t time it).

Worked like a charm in Mac computer. Durable and long lasting. Never had an issue.

It is so easy to upgrade your laptop RAM nowadays under Windows 11. Pop open the laptop, install the memory, button up and restart windows. The memory is automatically recognized and configured. So easy to go from 12 to 32 GB.