A-Tech 32GB (4x8GB) RAM for Apple iMac Late 2015 27 inch Retina 5K | DDR3L 1866MHz / 1867MHz PC3L-14900 1.35V 204-Pin SODIMM Memory Upgrade Kit

RAM upgrades are easy and affordable
In our household we have two iMac 27 inch, late 2015, with 8GB RAM. One has an i5 CPU, and another i7 CPU. They are still performing perfectly, and we never noticed during years of daily use any problem with them. We follow all Apple’s upgrades. While comparing response with Macbook Pro having 32GB RAM they are noticeably slower, perhaps the difference is due to the newer i9 CPU and not necessarily only larger RAM.Today RAM memory upgrades are affordable so I bought a 16GB kit (2x8GB) compatible DDR3L 1866MHz non-ECC SO-DIMM. Each operating system upgrade is always more memory hungry, thus more RAM should be beneficial.Now after upgrades one iMac has 2x8GB, and another 4x4GB modules. Thanks to the iMac design, RAM upgrades are very friendly. Everything is working as before, perhaps faster. Difference is not obvious without measurement that I didn’t bother with doing.I recommend the product and the seller for excellent service. They send the product promptly and well packed, with a phone helpline, and 100% satisfaction guarantee. Luckily, my upgrades went perfectly smoothly so there was no reason checking if their promises were kept to every letter.

Saved 30% on OWC pricing, and no errors on testing
My iMac (model 17,1) was a new release with the highest specs when I bought it in late 2015. I upgraded early on from 8GB to 24GB of RAM through OWC, and that memory has worked great. But I was not looking to spend the same price for RAM at the end of 2020 as I did in late 2015, and for a computer that was five years old. I took a risk on this A-Tech RAM to save 30% on the price of OWC. As the rightmost photo below shows, the RAM passed MemTest (free version) with zero errors. In terms of performance, the RAM increase was just 24GB to 32GB, so only a one-third increase. However, per the second-from-right photo below, the tests show memory pressure about halved from before the new RAM installation (Dec. 24, 2020). The use of compressed memory declined substantially (see third-from-right photo).I did not experience the problem reported by some other reviewers about the RAM not running at full speed. As the leftmost photo below shows, the memory is running at 1867 MHz. If your memory does not run at full speed, make sure that you are pairing the memory modules so that the new modules from A-Tech are paired with each other in your memory slots.My iMac was running fine even with 24GB, so don’t expect a major improvement jumping to 32GB. But at least the testing shows a performance improvement. I sense a bit of an everyday speed boost, but it has been slight. With Photos and iMovie, you might see some more benefit.

Great Price and easy to Install
I only had 8 gigabytes of memory in my apple and all the apps were running slow. My Apple can take 32 Gigabytes and I saw the price and how easy it was to install. The were exactly what they said it was and everything is running so much faster, so I would recommend buying your memory from this vendor.

Easy as pie
I was hesitant to put 3rd party RAM into my late 2015 Retina iMAC, but I upgraded from El Capitan to Monterey 12.5.1 (despite my wishes, long story) and my once quick iMAC slowed with the burden of a 2022 system running through a 2015 system bus and processor. 16 gigs of RAM were factory installed in two 8gig slots leaving two of the four slots unoccupied. A-Tech Premium memory 16GB Kit (2x8GB) was well priced, arrived as promised and popped in like I had been doing it all my life. After start up “About this MAC” (Apple Menu) saw and recognized the RAM the very first time, now 32 gigs installed. Boot up time building menus, desktop and dock feels about the same, but once everything in the system is loaded into RAM and ready to go, this thing zips along like it did in 2015. Love it. So satisfying. Highly recommended.

Fui muito bem atendido, o vendedor foi muito correto e entregou os pentes de memória bem antes do prazo combinado. Foi muito fácil instalar os pentes em meu Mac e não houve qualquer problema de compatibilidade. No entanto, recomendo ficar atento às especificações de cada máquina. No meu caso correu tudo bem. (Fiz o dever de casa, li o manual e pesquisei antes de comprar.)

the ram sticks work perfectly for mid 2012 macbook pro and lenovo thinkpad x220. I stick them in the laptops and they were read immediately. now 1 month after I installed them I didn’t get any issues with them

Item arrived sooner then was originally scheduled. RAM was recognized by iMac once installed. Just wondering why the model and serial numbers are blank compared to existing RAM that came with the iMAC. Is this an issue? Otherwise, seems to work fine at this time.