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Product Specs:
Professional Installation Highly Recommended
While this upgrade kit itself should not void your warranty, the installation process is very complex and thus it is recommended to be performed by a trained professional.
Memory Trade in
Save money by trading in your original chips! View available memory rebates.
From the purchase date of qualifying memory from OWC, you have 60 days to trade-in your old memory for a cash rebate!
Just fill out OWC's online rebate form or contact OWC Customer Service after you receive and install your new memory.
This memory kit and included memory is for Apple iMac 4K 2017 (21.5") Models only. Memory provided in this kit is special config for 21.5" ONLY and is NOT compatible with Apple iMac 27" Models. Included memory also compatible with PC Laptops which use DDR4 2133 or 2400 modules.

Includes

  • (2) 8GB 2400MHZ DDR4 SO-DIMM PC4-19200
  • (1) 21.5" iMac Adhesive tape set for proper display resealing
Please note: This memory kit and included memory is for Apple iMac 4K 2017 (21.5") Models only. Memory provided in this kit is special config for 21.5" ONLY and is NOT compatible with Apple iMac 27" Models. Included memory also compatible with PC Laptops which use DDR4 2133 or 2400 modules.

This OWC Memory is compatible with... Learn how to find your Mac's model ID or PC specs
iMac Intel
iMac w/Retina 4K display
(21.5-inch Mid 2017)
(June 2017)
Model ID:iMac18,2
3.0GHz i5, 3.4GHz i5, 3.6GHz i7
iMac Intel
iMac (21.5-inch Mid 2017)
(June 2017)
Model ID:iMac18,1
2.3GHz i5

Customer Ratings

Write a Review 5 / 5 6 out of 6 (100%) reviewers would recommend this product
Verified Buyer
Reviewer: MCinFP Location: Forest Park Age: 45-54 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Couldn’t have been easier October 9, 2020 Instructions in video were crystal clear. Watch it all the way through before starting. Screws were kind of tight. Had to use a ratchet tool with a t8 and t10 socket heads that I already had for the initial loosening. So happy that I could do this on my own. Went from 8 per slot to to 32 per slot. The computer goes at rocket speed now. :))

I would recommend this item to a friend! This review is from 64.0GB (2x 32GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: Firstmac Location: Wa Age: 25-34 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Flawless instructions September 25, 2020 Order was quick and arrived in good condition. The install was very smooth having the videos was a great aid to keep me from going to fast. Based off my reading I also highly recommend you test BEFORE you seal the screen on. Makes it easier in case something is amis. This was my first all in one and Mac upgrade. OWC will always be my go to now!

I would recommend this item to a friend! This review is from 64.0GB (2x 32GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: ElRayyes Location: Melbourne Age: 35-44 Experience Level: Home User Owned Product: 1-3 months
Rating: 5/5 amazing performance August 21, 2020 amazing performance my iMac is super fast and runs all the software I need with no issues at all. I upgraded from 8 GB memory. the video was super helpful and easy to follow.

I would recommend this item to a friend! This review is from 64.0GB (2x 32GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: Russty Location: Austin, TX Age: Over 65 Experience Level: Home User
Rating: 5/5 Great product. July 4, 2020 Great product.. Packaged wonderfully. Worked flawlessly. Also, the videos for how to upgrade 2017 iMac for memory upgrade were spot on!

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: spagett Age: 25-34 Experience Level: Gamer
Rating: 5/5 excellent and not that difficult June 23, 2020 I am just a random idiot but I was able to follow the video and upgrade the ram and also put a new SSD in my 21.5" Mac 2017. Everything is working perfectly. The video was great. The kit seemed perfect. I am so stoked!! Was considering buying a new computer but now my iMac is god mode.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: Shotgun82
Rating: 5/5 Increase Memory Ram April 18, 2020 I increased the ram from 8 to 16. CHAMP!!! Will buy again!

I would recommend this item to a friend! This review is from 16.0GB (2x 8GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: Manohar Location: Bogota, Colombia, South America. Age: Over 65 Experience Level: Noob Owned Product: 1-3 months
Rating: 5/5 Highly Recommended Upgrade – A DIY Project March 22, 2020 Upgrading the iMac

With the parts finally in my hands and armed with the OWC video, I set about upgrading the iMac. I must mention that the quality of the video is very good. I had it running on my laptop while I worked on the iMac. I paused the video every now and then while I worked. Many people fear the process of opening an iMac. That really, was the least of my worries. It is not such a delicate process once you understand how it is done. The major challenge for me, was disconnecting the various cable contacts within the computer. Broadly speaking, there are three types of contacts inside the iMac. Ones that are just slipped in and out; ones with a latch and a minuscule one with a tiny latch. The usual method is to tug at the cable to pull them out. Not ever having done the sort of work, I did wonder how much pressure was too much pressure. Some of the cables like the AC Inlet Cable, seem to be able to take quite a bit of pressure. Some appear to be so delicate that I was hesitant to even touch them. The cables leading from the Power Supply to the back of the Logic Board was a major challenge (because the instructions were incorrect). The OWC video instruction mentions. “… by squeezing the small tab and sliding the connector out of the socket.” I actually had to take out the entire Logic Board along with the Power Supply module, to look under the Logic Board. It appeared that one needed to pull the tab and then slide the connector out. In any case there is so little space to do that, by reaching under the Logic Board. There must be another way to do it. The rest of it was only careful application and a singular determination to complete the project successfully.

Closing The iMac

Closing the iMac was every bit as tricky as the opening of the machine was. I must mention here that the original Apple adhesive strips Appeared to be of better quality than the ones that came with the OWC Kit. There is also a little bit of a confusion as to positioning of strips 4L and 4R and why their face-up colour should be different. Do also note that positioning the screen at a slant (so that one can make the final two cable connections), before closing the iMac and aligning it flush with the base near the Apple Logo is a bit of a challenge. That final process needs a fair amount of care. The assistance of a second person to hold the screen up while you make the final reconnections, will be helpful.

Installing the Operating System, Migrating Software and Data to new SSD

Migrating the applications and data on the old Drive to the new SSD is a piece of cake, thanks to Apple’s Migration Assistant. Here, I must commend the ease with which the whole process can be handled. The time involved depends on the speed of one’s Internet connection and the amount of data on the old Drive. It took me only 30 minutes to install the Operating System. It took me about 2 hours and 45 minutes to migrate my data.

Read the whole story on my Blog: https://www.coromandel.co/en/technology-the-saga-of-upgrading-an-imac/

This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: titan
Rating: 5/5 Imac 21.5 18.2 4k display January 14, 2020 Thanks guys my imac is li roadrunner installed this 2x16gb and runs perfectly great goob (Just to let you know Icenter to change the ram he told me it wil cost you 1100euro cheets for then

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: Rookie Location: Central Missouri Age: 55-65 Experience Level: Noob Owned Product: less than a month
Rating: 5/5 Straight forward install but be careful November 7, 2019 I'm a normal computer "user" but pretty mechanically inclined and wanted to upgrade my ram on my 2017 iMac 21.5 4k. I watched the video several times and took my time. I even watched the video as I was doing the upgrade. My only issues I had with the install; I needed a stronger magnetic torx drivers and I broke the tiny ZIF connector going to the microphone while reassembling. Maybe in the video if there was a bigger close up of the tiny connector, or I would have researched the particular connector, I wouldn't have broker it. I rarely use the Microphone on my desktop so not a big deal. Understanding the type of connectors was my bigger issue with the install. I see why it was rated high on the difficulty scale. knowledge of the type of connectors would be a huge benefit.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: Gabe0071 Location: Jewett, TX Age: 55-65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 OMG leave all my apps open as it should be January 16, 2019 Previously amazed when in upgraded to a 1TB SSD but then 8GB memory limited the number of applications I could have open at a time and the number of windows open in memory hungry Safari. Doing Online College I would have 8 or ten windows open in Safari an need to do some homework in windows Word to follow along with the examples because the school course is based in Windows Microsoft software and the MAC 2016 version is not identical which led to wrong answers. Now I can do everything without having to close applications or browser windows. Full disclosure: I did have to find software to limit CPU usage by app and process to run everything I like to use at once.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: RonG77 Location: Upland, CA Age: Over 65 Experience Level: Power User Owned Product: 3-4 months
Rating: 5/5 Very good upgrade for our new iMac November 16, 2018 This upgrade kit saved me about $100 over buying more memory from Apple. I highly recommend it for anyone who has ability and is not afraid to take their computer apart. I would not recommend doing this if you are not competent removing and replacing boards, cables and other computer components. Be sure to clean off and remove all the old double faced tape.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: tmgoonan Location: tmgoonan Age: Over 65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Memory upgrade. November 4, 2018 My iMAC came with 8gb of RAM. It is not enough for post processing in Photography. 32gb is a whopping upgrade. Woo Hoo! Between the memory and the SSD drive my iMAC cooks.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: PdxMac Location: Pacific Northwet Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Opening a 21.5" iMac is intimidating, but not overwhelming November 1, 2018 The 21.5" iMac is even more challenging to work on than the 27", but if you take your time and don't lose any screws, you can do it. The pizza-cutter screen tool is the best thing since sliced bread. Just make sure you install all the memory and disk you'll need for a while, because it's still a hassle to open the machine, and the fewer times you have to do it, the lower the chance you'll break something.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:

Verified Buyer
Reviewer: sier Location: Osaka, Japan Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 so far so good memory upgrade January 24, 2018 This is a cheap but reliable way of memory upgrade! Installed in iMac 2017 4k without any problems. Recommend!

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

Verified Buyer
Reviewer: CrVik Location: Kazakhstan Age: 25-34 Experience Level: IT Professional Owned Product: less than a month
Rating: 5/5 Great shop! December 17, 2017 This is a good upgrade kit easy install and worked fine! Thank you MacSales!

I would recommend this item to a friend! This review is from 16.0GB (2x 8GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit w/ Installation Tools. Customer Videos:

OWC Memory 16.0GB 2 x 8GB PC4-19200 DDR4 Kit Mfr P/N: 2421DDR4S16P OWC SKU: OWC2421DDR4S16P OWC Memory Upgrade Kit Ships: Same Day only $77.99
Add to CartOther World Computing 2421DDR4S16P In Stock, Click to Buy Now
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