Crucial 4GB, 204-pin SODIMM, DDR3 PC3-14900,

I really don't have much to say, other then I bought two of these kits for my new 27" late 2015 iMac to get a total of 32 GB, and the computer has been rock solid. When I bought this ram it was selling for $109 a kit, and it was too good a deal to pass up to get. a full 32 GB of ram. The memory is extremely easy yo install on the iMac. 1. shut down the iMac from the apple menu. 2. disconnect all cables. 3. lay the iMac face down on a soft and stable surface such as a bed, or other such as a table with a towel over it. 4. Use a pointed object such as a pen, to gently , but firmly push the button located inside the power terminal to release the memory door. 5 Remove memory door and release the memory cartilage levers. 6. insert new modules making sure to line up the notch on the DIMM with the slot and press into place until it clicks. 7. lock the memory carriage back into place with the tabs, and replace ram door. 8. Reconnect iMac and power one. Don't be alarmed if the Mac takes a few seconds before the chime, as this is normal to test and calculate the new ram, the first time.

Purchased this specific Crucial model with 4GB memory as recommend by other DS218+ users. Installed the memory into the DS218+'s second memory slot and upon power up the diskstation immediately recognized it and booted successfully. Verified the operating system now shows 6GB installed (2GB original plus 4GB new).

Crucial is one of the best quality OEM-grade memory suppliers. I used this RAM to upgrade my iMac (5k 27 inch' late 2015 model) from 8 GB to 32 GB. This RAM is precisely matched to Apple's specs. It installs easily in this model and the Mac recognized it immediately. No issues whatsoever. My iMac is now a true powerhouse that can handle pretty much everything with zero slowdown. Great product. And Amazon's price was the best (I did a lot of searching across multiple online and retail vendors before making this purchase.). Highly recommend.

I bought this to work with a late 2015 iMac 27" Retina, and one of the modules was defective. My GPU started to crash all the time, and the modules where the issue. After an extensive and tiresome trial and error, which the iMac crash all over the place, I finally found the module which was bad and requested a return. On that matter, Crucial's customer service was stellar. They were helpful, prompt and ready to help. Sent me a new module without trouble and now I'm back to work with 32GB. Only reason why I'm not giving it 5 stars is because after almost a month of no issues, yesterday I had another crash, so I'm a bit skeptical there might be another module which is not perfect. Time will tell.

I picked up 2 of these x2 kits for my Late 2015 27-inch iMac. I'm happy to report (and confirm for potential iMac buyers) that they work flawlessly. Installation is a breeze, and several guides can be found by doing a quick Google/YouTube/etc. search. The biggest tip I can give is to make sure you avoid static when installing. My iMac properly recognizes these chips, and the specs are exactly what you need. Some of the specs listed don't appear to match up (e.g. 1866 vs. 1867 MT/s) but I can confirm, both from experience and from chatting with Crucial support, that this kit is exactly what you need if you want to upgrade your Late 2015 iMac to either 16GB or 32GB of RAM.

During Thanksgiving I decided to purchase a new IMac. The only one left with the 27 inch screen was a base model with 8gb ram. As I was using it I noticed the spinning beach ball a few times. Now I'm not a serious programmer that needs a supercomputer to satisfy me, but I tend to have many applications open at one time(photos, I tunes, multiple web pages, and a few apps). This is where ram is probably the most useful. 99% of the time you will never need more than the factory 8gb, but for less than 5 minutes and $100 you can make your machine run a little smoother and a little quicker. Possibly future proof your computer as well being it could last for up to 10 years. I figured I would keep the two 4gb Apple ram chips and just add the Crucial 16gb kit. This is where things got interesting. I read ten different ways that people recommend doing this. I won't rehash all the ten pages of forum discussion just tell you what I did. I placed the new Crucial chips in slots 2 and 4 where the Apple chips were and moved the Apple chips to slots 1 and3. This showed 8-8-4-4 when I rebooted the computer for a total of 24gb. My logic was that the computer would be drawing from the first bank of 16gb before drawing from the Apple 8gb. Either way it works great and took no time or tools to do. If you get the beach ball this is a great upgrade. This will only work with the 27 inch screen and get the right speed for your iMac. Mine was a late 2015 model.

Perfect upgrade fir my late 2015 17"iMac. Having purchased memory directly from crucial in the past I was confident that this would be a quality product. Super easy to install on an iMac, no errors or problems after booting. I run my machine 12-15 hours a day and after 2 months of use I have not had any memory related issues at all. I will be ordering another set to make for a full 32GB upgrade.

I was able to replace the default 2GB that the DS418play comes with the 4GB of CT4G3S186DJM.

Using it on iMac late 2015 model which is the latest. Working perfectly. It is written here as 1866MHz but will detect as 1867 MHz DDR3 when you see it in 'about this mac', which is the right one for this model. Please do refrain from buying lesser one such as 1600MHz or lesser.

La compre con motivo de ampliar la memoria del NAS Synology DS218+, que tenía solo 2 GB de memoria RAM, y ahora con esta ampliación ya tiene 6 GB. Mejora bastante la velocidad con que se abren las aplicaciones en el NAS y hasta el día de la fecha funciona a la perfección. Recomiendo ampliar la memoria del NAS, se nota la mejoría.

Primero: hay que ir a la página de crucial punto com y descargar una aplicación que inspecciona tu Mac y determina cuál memoria que venden ellos es compatible Segundo: antes de tocarla con las manos, hay que descargarse de la electricidad estática tocando la pared o el suelo Tercero: hay que instalarla en las ranuras que están libres, no reacomodar las memorias de otra manera Eso es todo, son completamente compatibles con la memoria que ya trae tu Mac y no hay necesidad de desechar las originales Imac 27" late 2015

I was sort of surprised when I saw this in my list of orders because I didn't remember ordering it. Then it hit me, I got this for a Synology NAS (the DS218+) and it's been so trouble free, I forgot I bought it. It was easy as pie to install, and the system started to register it right away. This was way cheaper than the brand name RAM Synology sells. Update May 3, 2019. I saw this review, and yep, still RAMs still running fine.

Ich habe mir den Riegel als Erweiterung für meine Synology DS718+ gekauft. Erfüllt exakt die Vorgaben von Synology. D3NS1866L-4G wichtig hier sind die 1866 MHz Takt und DDR3L non-ECC Unbuffered SODIMM. Für den Preis von unter 25 Euro für 4 GB. Funktioniert einwandfrei und wurde gleich erkannt.