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4.0GB OWC Memory Upgrade

4GB 2400MHZ DDR4 SO-DIMM PC4-19200
OWC Memory Lifetime Limited Warranty including the OWC Lifetime Advanced Replacement Program | 30 Day Money Back Guarantee
Memory Image
Product Specs:
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.
- Please allow up to 14 Days from the time we receive your memory for testing and rebate processing.
- The OWC Rebate is for up to the same number of memory modules purchased and must be in working order.
Special Note for 21.5" iMac (Late 2017) imac18,1 and 21.5" iMac (Late 2017) iMac18,2: Installing memory in a 21.5" iMac (2017) requires tools to open the machine and adhesive to reseal it. For a complete installation solution, see OWC Memory Upgrades for 21.5" iMac with Retina 4K & Non-Retina Display (2017).
This OWC Memory is compatible with... Learn how to find your Mac's model ID or PC specs
iMac Intel
iMac w/Retina 5K display
(27-inch Mid 2017)
(June 2017)
Model ID:iMac18,3
3.4GHz i5, 3.5GHz i5, 3.8GHz i5, 4.2GHz i7
Detailed specs
Install Videos
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
Detailed specs
Install Videos
iMac Intel
iMac (21.5-inch Mid 2017)
(June 2017)
Model ID:iMac18,1
2.3GHz i5
Detailed specs
Install Videos
PC Laptop
PC Laptops
Compatible with Intel / AMD Process based PCs capable with the specifications listed above. Memory complies with JEDEC Specifications, document JESD79-3B.

Customer Ratings

Write a Review 4.9 / 5 37 out of 39 (95%) reviewers would recommend this product
1 2 3 4 5
Verified Buyer
Reviewer: Davide
Rating: 5/5 Perfect November 1, 2019 I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:
Verified Buyer
Reviewer: JoelTee Location: Holden Beach NC Age: 55-65 Experience Level: Home User Owned Product: over 6 months
Rating: 5/5 Awesome service August 19, 2019 I bought one pair and it wouldn't work in my 2017 iMac. OWC returned them, tested them, replaced them and the new set works as intended. Thanks for the fast turn around and professional service

I would recommend this item to a friend! This review is from 8.0GB (2x 4GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:

Verified Buyer
Reviewer: egClone Location: Johnston, IA Age: Over 65 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 OWC Memory April 3, 2019 I've use OWC memory upgrade kits in the past for all of the Macs that I have had. Never had an issue . Just put in a pair of 8 GB in my 5K iMac and it showed up right away after the startup.

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. Customer Videos:

Verified Buyer
Reviewer: PatR Location: North GA Age: Over 65 Experience Level: Power User
Rating: 5/5 Other World Computing Comes Through Again! November 20, 2018 My one year old iMac needed a boost in memory (as do I-but that's another story). I used the Chat window, 'chatted' with a knowledgeable tech, asked a few questions and then ordered my memory chips.

They arrived two days later and thanks to OWC videos, my new RAM was installed, EASILY, in under 3 minutes!

I've purchased several products from OWC over the years and they just always come through with great deals, great videos and great technical assistance if you need it. Thanks, OWC!!!! 5 stars, as usual! :-)

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. Customer Videos:

Verified Buyer
Reviewer: Luna Location: NJ Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Life Changer November 20, 2018 The memory upgrade I purchased from Other World Computing/MacSales.com allows me to work at 64 samples without audio clicks and pops. As a composer this allows me access to percussion VSTi's and integration with fantastic computer based hardware that previously were unusable due to latency issues at a 128 sample rate. Considering the time and money I have invested in programs and gear this upgrade was for me a life changing experience. Overall my whole system is more solid and fluid. It is as if the i7 processor was built to utilize the full memory capacity of my machine. Installing was easier than I imagined. I popped out the 4x8 GB PC4-19200 DDR4 2400MHz SO-DIMM's and installed the 4x16 MG PC4-19200 DDR4 2400MHz SO-DIMM's and my machine booted right up and showed the new memory in the system. Immediately I could see the power of the increased memory with the speed at which I opened programs, even my mouse seemed to glide more fluidly. And when I started using my software I knew I had made a wise investment. I do not recommend taking chances buying CPU intensive programs without having the memory to handle it in the first place, but upgrades in Mac's happen fast and programs are eager to use the extra processing power. Increasing memory is one of the best ways to get more out of your machine. As it stands now with new Mac's I believe it is the only upgrade possible. Thanking MacSales.com for increasing my workflow and opening the door to some fantastic possibilities.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:

Verified Buyer
Reviewer: dogluva
Rating: 5/5 So far, terrific! November 4, 2018 I purchased 2 sticks of RAM for my Mac a few weeks ago. Good price, well packaged for delivery. Installed without a hitch and so far, so good. Machine is way faster, and the entire process of buying and installing was very easy. I've never ordered from OWC before, but it was recommended to me and I would purchase from them again.

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: indigoDan Location: Philadelphia Age: Over 65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 More Memory! October 29, 2018 I've been buying my upgrade memory from OWC for years. Works great, easy tutorial and I get a rebate. What's not to like about that.

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: Joey99
Rating: 5/5 Works perfectly October 5, 2018 I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:
Verified Buyer
Reviewer: ChetNC Location: Greenville, NC Age: 55-65 Experience Level: IT Professional Owned Product: less than a month
Rating: 5/5 Works great and quick delivery September 24, 2018 No problem with the memory in my iMac. Removed the old memory, install the new memory and system reported the total of 64GB the first time and have had no problems with the memory.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:

Verified Buyer
Reviewer: Charger01 Location: Alvarado, Texas Age: 45-54 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 shipping September 16, 2018 i don’t know about the product yet but i did free shipping cause i ordered computer from Apple. they got here in days it will be another week before ill get computer

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: NopSled Location: Grovetown, GA Age: 45-54 Experience Level: IT Professional Owned Product: 1-3 months
Rating: 5/5 Performs Perfectly! September 2, 2018 Installed the 4 DIMMS into my new iMac with no issues. I've experienced none of the quirky system issues that are normally associated with RAM. This memory has performed perfectly!

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:

Verified Buyer
Reviewer: ManyPhotos Location: Dallas, Texas Age: 55-65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Don't panic after installing your RAM! August 20, 2018 I just bought a new 27" iMac 5K and added the OWC 32 GB RAM kit to it before I even plugged it in. The process is very quick and very easy -- it took maybe two or three minutes. No problem -- but be aware. The machine would not turn on when I first plugged it in, so I looked up the symptoms on my phone and was relieved to discover that it's normal. Newer Macs have to initialize any RAM when it is first installed or the RAM configuration is changed. I just followed the recommended routine -- unplug the machine, hold down the I/0 button for at least ten seconds, then plug it in and hold the button in again until it starts up. Everything boots properly and you're off and running. As I don't buy new Macs often, I was unaware of this change. But panic averted, I have a new machine with plenty of RAM and everything working just the way it should!

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: LensguySteve Location: Southampton Age: 55-65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Works as described, without a hitch! August 20, 2018 Easy to install, fast shipping, less expensive than competitors, what else can I say...... oh yea Works Great!!

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. Customer Videos:

Verified Buyer
Reviewer: DarthXoc
Rating: 5/5 Works great; turns the iMac into a real powerhouse! July 23, 2018 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: DarthXoc
Rating: 5/5 Excellent value compared to Apple's prices! June 24, 2018 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. Customer Videos:
Verified Buyer
Reviewer: Deelee Location: Ithaca, NY Experience Level: Noob Owned Product: less than a month
Rating: 5/5 Easy to install June 19, 2018 The order came quickly. The memory was extremely easy to install. Computer recognises it as such, so we are good to go!

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: virtualmeida Location: denver Age: 55-65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Easy install - works great June 11, 2018 Put this into our new iMac 27" 5K, kept the existing stock RAM in place & added an additional 32Gb of RAM. Love buying from OWC, you know their products work & easy install,

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: troy20 Location: NYC Age: 35-44 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 32.0GB OWC Memory Upgrade Kit for iMac 27" 2017 with Retina 5K June 6, 2018 First of all, I have been a Macsales customer since 1990's. Everything I have purchased from them worked perfectly. I have a new iMac 27" 2017 5K w/ 3.4 processor. Like all iMacs it came w/ 8GB stock memory which is not adequate to run today's software. So, I purchased 32GB upgrade (2x16). Now I have a total of 40GB memory (32+8=40). It is a good idea to get two 16GB's because if you need to upgrade it to 64GB maximum in the future you can add just another pair of 2 x16 memory! Installation was really easy. Just unplug your iMac, put it on a soft surface screen face down. Press the memory cabinet cover pop up button down, slide in your new memory sticks, power up your computer and you're done. Note that you need to press the button really hard in order to pop up the cover. I used wood chopsticks to not to scratch my computer. Also, make sure to slide your memory in a correct way. It should be firmly in place and should not move. Today is my second day after upgrade and I am very happy w/ awesome performance.

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: Aclarion Location: New York Age: 45-54 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Excellent Service June 3, 2018 Great Price and fast shipping. The extra memory has improved performance.

I would recommend this item to a friend! This review is from 8.0GB (2x 4GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:

Verified Buyer
Reviewer: saltydog Location: Ottawa Age: 45-54 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Plug and play May 17, 2018 New ram was easy to install and works great.

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: thedvsmonkey Location: Virginia Beach VA Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 No Brainer! May 1, 2018 I honestly feel this is a no brainer! I boosted my iMac from 8Gb to 16Gb with 2X4Gb chips from OWC. I then decided it was necessary to just get a 32Gb set to boost to 40Gb. I do not regret this one bit and my iMac flies! Don't waste money buying the ram from Apple! I'm almost tempted to get another 32Gb from OWC and just max out the iMac.

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: Aceman Location: Newton, MA Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Blazing Speed! April 30, 2018 Turned my iMac into a rocket! Don't buy directly from Apple and get ripped off. Buy from OWC and save a ton.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:

Verified Buyer
Reviewer: topspincharlie Location: Crofton, MD Age: 35-44 Experience Level: IT Professional Owned Product: less than a month
Rating: 5/5 Cost effective way to max out imac and save $720 April 29, 2018 Very easy to install, saves ~$720 off of purchasing imac with this memory.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Upgrade Kit. Customer Videos:

Verified Buyer
Reviewer: xABD Location: Western TN Age: Over 65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 You can't have too much RAM! April 25, 2018 Bought a new iMac with minimum RAM fully intending to use third-party memory sticks. I have always had great experiences with OWC and found their 16GB modules were my best choice. Installation is a breeze and the chip has performed flawlessly!

I would recommend this item to a friend! This review is from 16.0GB 2400MHz DDR4 PC4-19200 SO-DIMM 260 Pin CL17 Memory Module. Customer Videos:

Verified Buyer
Reviewer: vailtc Location: Colorado Age: 55-65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Works great! April 9, 2018 Works just like it is supposed to. Easy to install. Directions simple to follow.

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. Customer Videos:

OWC Memory 4.0GB 4GB PC4-19200 DDR4 Mfr P/N: 2400DDR4S4GB OWC SKU: OWC2400DDR4S4GB OWC Memory Upgrade Kit Lifetime OWC Limited Warranty Ships: Same Day
Reviews (39)
only $24.99
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