Crucial RAM CT2K32G4S266M 64 GB Kit (2 x 32 GB) DDR4 2666
Crucial RAM CT2K32G4S266M 64 GB Kit (2 x 32 GB) DDR4 2666 MHz CL19 Memory for Mac, Gree
Reliability for Mac systems
When you use your Mac system, you expect intuitive, dependable performance. Expect the same out of your memory. Every Crucial module that leaves our doors has been tested at the component level for voltage and temperature resistances, signal integrity, and software compatibility.
Speed for Mac systems
A memory upgrade is the fastest, easiest, and most affordable way to get more performance out of your Mac system. Upgrade your Mac with Crucial memory modules and maximize your creativity with top speed and high density DDR3 and DDR4 memory modules
Support for Mac systems
Unsure how to install memory or have an important question about your Mac system? Let the Crucial experts help! They know Apple systems inside and out and enjoy providing helpful, friendly technical support. Whether it’s phone support, videos, FAQ articles, or do-it-yourself install guides for more than 70 different Mac systems, Crucial has the resources you need to keep your system up to speed.
Micron quality – A higher level of reliability
As a brand of Micron, one of the largest memory manufacturers in the world, Crucial memory for Mac systems is backed by the same quality and innovation that has produced some of the world’s most advanced memory and storage technologies. With a product portfolio that includes upgrades for more than 100,000 systems, we’ve got one specifically designed for your Mac system.
| Weight: | 9.07 g |
| Dimensions: | 6.86 x 0.51 x 2.79 cm; 9.07 Grams |
| Brand: | Crucial |
| Model: | CT2K32G4S266M |
| Colour: | Green |
| Batteries Included: | No |
| Manufacture: | Crucial |
| Dimensions: | 6.86 x 0.51 x 2.79 cm; 9.07 Grams |
I bought this to upgrade my iMac 27 inch 5k retina (bought 2020 but is a 2019 model for some reason) there are four slots and I’d specced it back in 2020 with 16gb of ram. So as my music making got ever more sample based, some of my piano sounds can be 4Gb alone I thought let’s get more ram. Mac says my model will support 64gb of ram so that’s what I bought in two lots of 32gb. I read everywhere that people were getting 128gb of ram to work so I thought I’d just put it into the two free slots. Switched on and it loaded first time and now I have a total of 80gb of ram. Things do load more readily and I’m not getting any warnings on big projects so all is good.
Oh another thing. This ram is 2666 mhz and Mac state 2667mhz don’t let that out you off, it’s actually 2666.9mhz for both and Mac choose to round up. It now states that it’s all 2667 mhz on the inspector window.
Easiest installation ever, worked perfectly as soon as I turned the machine on.
It feels a lot less sluggish now. I have opened InDesign, Illustrator and Photoshop at the same time (something the machine used to struggle with) and opened various large working files. I can flick between all 3 programs a lot smoother than I used to.
Very very happy with my purchase.
Have used Crucial before and they are just brilliant. Such an affordable way to increase your RAM, instead of paying eye watering Apple prices. Just look up your computer specs on their website and you can find the RAM you need. So easy to install, a child could do it. Just remember to touch something to ground yourself prior to installation, so you get rid of any unwanted static while you complete the operation. Have updated all my Macs by using their RAM. Never had a problem, so happy to recommend. Quick delivery and always reliable.
There is an easy to remove cover at the back of the iMac, a couple of springy clips allow you to move the memory carriage into an accessible position. The old memory just lifts out and the new memory slotted in the same place. It took longer to remove all the connections at the back of the computer than it did to replace the memory modules.
If you need to check what memory is in your iMac click on the Apple (top Left), select About then select memory and a graphic shows you what memory modules you have and which slot they are in. Slots 1 & 3, and slots 2 & 4 are paired and need the same memory modules in each one of the pair, though 1 & 3 can have different RAM values from 2 & 4. So I put each of these two 32gb modules in slot 1 and slot 3.
When I turned everything back on the iMac worked as if nothing had happened, but I ran a Photoshop test that was taking 4 minutes with 8gb RAM. It was now almost instant with the 64gb RAM upgrade, so I’m very pleased with my purchase.
As an old school graphic designer that uses Adobe CC software for print and digital, I’ve always been on the lifelong learning curve with tech that is several steps/planes ahead of where I am right now. Most of the time this does not inhibit my day to day use of the main software tools but having speced my Apple desktop Mac with the maximum RAM capability I found that in the age of remote working and being networked so much of the time that this phenomenon more than anything slows down the machine when my broadband connection becomes not so broad after all.
The moral of this story is that to get the best out of this product is to be offline as much as possible.
I bought this RAM as I wanted a single 32GB DDR4 SODIMM stick for my new Framework laptop (DIY Edition i5) and it was ~20 cheaper than the equivalent non-Mac sticks. Contrary to the ‘official’ answer to a question about using this in a non apple device – it works fine, as it’s standard DDR4 SODIMM. Full 32GB detected and usable by Fedora on my laptop, no issues. I wouldn’t use non-Mac RAM in Macs however as they can be very fussy about tolerances and error checking.
Bit of,a bargain at this price, (125), bought to upgrade a recently purchased iMac.
Went from 16 to 40Gb and notice a lot of difference. Start up times appear to have reduced and no slowing or spinning beach ball when having numerous windows open.
I use proprietary structural engineering software running under windows 10 in a virtual environment (parallels) with native Mac AutoCAD, as well as MS office and a other bits and pieces.
Since upgrading I can run a windows on one screen and a Mac screen without any loss of speed, brilliant.
Excellent value and a brilliant, simple upgrade.
This is the only non-Apple memory that will work in a 128 GB configuration in an iMac.
I have verified this in a professional motion picture production environment over a year.
Other brand memory in a 128 GB configuration will produce multiple crashes every day!
I bought a 2020 iMac 27″ but was astounded at the price for RAM upgrades – so after a bit of a web search I found this as a viable RAM upgrade option.
I was not disappointed in any way at all – it took me literally 2 minutes to install this and my Mac now runs like the powerhouse it should do, at a fraction of the cost that I would have paid if I had bought this direct.
If you have upgradable RAM options in your Mac, do this now! I can now run GPU-intensive activities like photoshop and indesign in a flash and they run simultaniously without any lag whatsoeve
Unlike the smaller 21.5″ iMac and some of the newer models, the Ram in the 2020 27″ iMac can be easily upgraded, and yes I can confirm that it’s very easy to do and has resulted in the RAM going from a paltry 8GB to a far more impressive 40GB because the old RAM chips can be retained.
Sure the new iMacs are coming out, but they seem to be missing ports on the back, and realistically I’m not going to be rendering 5K videos for the foreseeable future, mainly YouTube, emailing, and some photo editing, so have purchased Affinity photo editing software so am well sorted.
This has to be one of the easiest fixes to speed up your computer and will future-proof it for many years. The Crucial RAM upgrade has to be one of the best buys at the moment, and aside from changing the HDD to SSD or using an external SSD to store your files on if you have a tiny internal SSD drive there aren’t really a lot of other steps you can take to make your computer run faster.
Highly recommended if you have a 2020 (or older) 27″ iMac and want to speed it up a bit.
I purchased a iMAC 27inch 5k 2020, with 8gb Ram installed, purchased 2 x 8gb to take me to 24gb I’m not a gamer but a 62 yr old female geek! figured I’d upgrade it so the setup will last me a while.
it was a breeze to install.
if i can install it anyone can!
Over the years I have always gone for Crucial memory upgrades because of the guaranteed quality and reliability. I bought this to upgrade my Retina 5K, 27″, 2020 iMac with its 3.8 Ghz 8-core Intel i7 processor. At restart the iMac immediately recognised the memory, giving me 40 Gb. Happy days …….
I got this for my iMac 2020 5k 27″. It took me less than 5 minutes to install and works perfectly. It has really reduced the memory pressure in the activity monitor. I removed the existing sticks and put the new ones in the original slots. 32 GB might be a bit overkill for for the music production that I do but it’s there if I need it. I would definitely recommend this product.
If you use Apple computers you’ll know that they charge exorbitant prices for RAM which has to be installed by their technicians on most (but not all) of their computers. It’s why I bought an Apple iMac, a rare exception for which you can easily buy your own RAM (from Crucial) to install yourself without voiding your warranty. Apple would charge me 600 for 32GB of this RAM whereas Crucial will sell me exactly the same Apple approved 32GB of RAM for 140.
Used to add 32Gb (2 x 16Gb modules) memory on a new iMAC and used in conjunction with 16Gb pre-installed Apple memory.
Works perfectly. I have used Crucial memory modules on MACs for many years and they have always been straightforward to install and reliable. They are very much cheaper than Apple’s.
I was very sceptical about upgrading the memory on my beloved iMac, but took the plunge after new year as this was my resolution to fix it. It was becoming unbearable slow and unresponsive to typing and general functionality
The installation process was simple, quick and effective
Wow what a difference!
I can now type in “real-time” rather that waiting for the Mac to catch up and can have more that one program open at a time
Cannot praise enough – thank you for giving my my sanity back…
I upgraded 2 laptops with this. one had 2 4gb 2666 sodim. The other 8gb, 2400 sodim. With this as the primary in one and the other 4gb – no windows test memory errors. With a 8gb 2400 primary in the other and 4gb 2666 in the other, no windows memory test errors. A bit lucky but fantastic. However, it does seem to play well with other manufacture
My 2017 5K iMac had 8GB of RAM it now has 16GB… Taking out the old RAM and replacing it with this kit (As opposed to simply adding it in) resulted in the Memory speed increasing to 2667Mhz which is a tidy little speed bump as well.
Noticeably faster in some tasks, particularly memory intensive ones and gaming.
iMac 2019 27inch 5k Retina Model – existing base capacity 8GB; increased to 24GB.
You can mix modules, you have to buy a kit or twin modules to fill in the two remaining slots.
Gen. rule of thumb about RAM – buy in pairs and always fill in all available slots. 2 slots should remain free, never none or odd numbers i.e. 1/3.
If you want to optimise you always put RAM with the highest capacity in the bottom (Bank 0) and 3rd (Bank 2) from the bottom. Then the original RAM modules swap to the new positions of slot 2 (Bank 1) and 4 (Bank 3).
Where my pre-installed 2 NR 4GB modules were I swapped with the NEW 2 NR 8GB modules. And then put the already pre-installed 2 NR 4GB modules in the 2 remaining slots.
Called the support number 08000910021, chap was helpful and has promised to email me a list of compatible memory cards. Afraid this on has to go back.
I’ve used Crucial for memory upgrades a number of times in the past. The chips are supplied in matched pairs as iMacs require. The installation on a 27″ iMac is a simple task and as soon as I was done with he install, I had 40G of memory to play with and my Photo and video editing got a lot quicker.
The memory does what it says on the box and the price is excellent.
Firstly, this was put into the NEW 2019 iMac as above. I can confirm it works perfectly, no issues.
PLEASE NOTE: I made a mistake in purchasing only one of these as I thought they came in pairs. That’s my fault but they offer these in pairs slightly cheaper, but no big deal. They must be in pairs! I just didn’t read it properly.
Anyway, once I had both they are very easy to install (5 mins) and a reboot and you’re off! I placed the new pair in the empty slots and left the original RAM from Apple (X2 4GB sticks) in the original slots they came in. So simple, and I now have 24GB RAM for less then 90. Speeds things up and will be future proof for some time now. Highly recommended.
My iMac came as standard with 8GB (2 x 4GB), so I put the RAM cards into the 2 empty slots. Upon starting, the iMac came on, but gave a permanent black screen. I then tried to reset the NVRAM/PRAM as others have explained, but this didn’t work. I took out the RAM cards and replaced again because some reviewers suggested it is hard to get a snug fit into the iMac RAM slots. I again performed a NVRAM/PRAM reset. I actually thought that this had failed again and whilst trying to find the Crucial Helpdesk number realized that the iMac flickered to life. As such, I think a degree of patience is required for the Mac OS to recognize the new RAM upon first installation…. Never had this problem with either my MBP or Mac Mini, but then again, these were straight replacements, whereas this was to install new memory into the 2 empty slots of the iMac. I’m very happy with the performance of the iMac now – 40GB should be more than enough for my current statistical analysis and computational modeling needs.
I had 16GB installed in my iMac 27 inch 2017 4.2Ghz i7, and then installed 32GB on top of that. I am lazy and keep 40 or so web pages open at any one time. I can switch between Word, Powerpoint and Safari and Firefox and rarely get system hangs. If they do happen, it is my fault for being lazy for not shutting down somethings when I have truly finished with them.
Installation was fairly easy, but not a complete breeze. Read what others tell you about this.
I am very happy and a lot less frustrated.
My machine is a 27″ iMac 5K, mid-2017 model, 4.2GHz i7 processor and I was looking to upgrade on the original 8Gb memory. I was concerned that when one reviewer recorded that this memory hadn’t worked for them, I might suffer the same problem, though when I researched the Crucial website, the indication was that this part number should work.
The original memory modules were inserted in locations 2 & 4 (counting “1” from the top of screen). When this (CT2C16G4S24AM) memory arrived, and I installed the modules in the empty 1 & 3 locations, I disappointedly found that the Mac wouldn’t boot up.
After a call (0800 091 0021) to Crucial Technical Service, the very helpful agent confirmed that the part number should indeed work. I’m happy to say with a bit of perseverance, and great guidance from the agent, we found that by inserting the new modules in position 1 & 4, and the original modules in positions 2 & 3, my Mac booted up and found the full 40Gb.