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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: impetersome Location: North Carolina Age: 25-34 Experience Level: Home User Owned Product: over 6 months
Rating: 5/5 The best, most reliable products for my Mac! November 25, 2020 Buying from OWC, I am confident that I am putting the best quality parts in my iMac and Macbook Pro. The website is extremely easy to navigate and it has everything categorized to my specific Mac model, so no need to do extra research to figure out if a certain part or upgrade is compatible with my computers. The detailed installation videos are the best part for us DIYers. Thank you for taking the time to make videos of every Mac computer for every hardware installation. It's always a pleasure shopping here.

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: Nathan Location: Sydney Age: 35-44 Experience Level: Home User Owned Product: 1-3 months
Rating: 4/5 Premium shipping rate not delivered November 2, 2020 I find that this website is great as it allowed me to zero in on the items that I needed relative to my current iMAC model. The overall transaction process was great except for the international shipping. I paid a premium service to have it delivered within 4 weeks but this did not happen. I received the parcel after more than 4 weeks.

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: Deivi Location: Puerto Rico Age: 35-44 Experience Level: Power User
Rating: 5/5 Great!!!! August 10, 2020 Fast delivery and super easy installing, thanks!!!!

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: madmeg Location: Story, WY
Rating: 5/5 Like New August 4, 2020 OWC RAM is a fantastic value. I always buy a new Mac with either the lowest RAM configuration or close to it. Then a few months later I max it out with OWC's RAM. And it's like getting a completely new Mac! Had to do it a little earlier this time. My music production software was complaining about real-time processing. But once installed, I haven't seen any warnings.

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: hn394441
Rating: 5/5 Working Perfectly July 24, 2020 Easy to install, and working perfectly as expected.

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: GerfnitAuthor Location: Highland Park, IL Age: Over 65 Experience Level: IT Professional Owned Product: less than a month
Rating: 4/5 I'm at maximum warp, uh, er, I mean RAM July 5, 2020 My 2017 iMac 5K is now at 64GB of RAM, all from OWC. I'm trying to stretch this machine a couple of years before I replace it. No matter what Mac I buy, I always seem to bump up against a performance ceiling. OWC is always there to help me upgrade.

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: JamesKentfield Location: Wilshire, England Age: 45-54 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Great product July 4, 2020 Super easy to set up, and the packaging was very secure. It shipped in record time. I was very happy with this purchase.

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: Thejuan Location: KY Age: 55-65 Experience Level: Home User Owned Product: 1-3 months
Rating: 5/5 One Word..AWESOME!!! July 3, 2020 Received my Memory Upgrade in a very timely manner. Very easy installation.GREAT PRICE!!!!!

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: Rextechs
Rating: 5/5 Excellent upgrade, works flawlessly. May 2, 2020 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: BILLYBOY Location: westchester ny Age: Over 65 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 GREATEST PRODUCTS April 24, 2020 I ordered these memory upgrades for my computer and I want to report this product is amazing. I installed them myself and they worked flawlessly. Not a single problem and they booted up instantly.This company makes great products period and ships instantly.

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: 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:
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 $19.99
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