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OWC Special Offer Available

$70.99 off *NOW* Get Parallels Desktop Pro Edition - Windows/Multi OS Compatibility software for Mac - Only $29.00 with select OWC SSDs, HDDs, Memory, External Storage, and Optical Drives! (Limit 3 rebates, 1 rebate per qualifying item)
Must purchase with: PPDPROSUB1Y-REB29
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.
Note: For 27-inch iMac (2020) models — iMac20,1 and iMac 20,2 — OWC recommends that all DIMMs be the same capacity, speed, and manufacturer to ensure optimal memory performance.
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 2020)
(August 2020)
Model ID: iMac20,1; iMac20,2
3.1GHz i5, 3.3GHz i5, 3.8GHz i7, 3.6GHz i9
Detailed specs coming soon
iMac Intel
iMac w/Retina 5K display
(27-inch Early 2019)
(March 2019)
Model ID: iMac19,1
3.0GHz i5, 3.1GHz i5, 3.7GHz i5, 3.6GHz i9
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 / 5 123 out of 128 (96%) reviewers would recommend this product
1 2 3 4 5 6
Verified Buyer
Reviewer: SBrown
Rating: 5/5 Yes the product is excellent June 15, 2021 But it took 11 days from the time I ordered until delivery. That is unacceptable. I except better from OWC. I love your products but it seems like I have to wait a long time for delivery unless I pay to expedite. I have ordered items from B&H Photo in NYC and get them faster with free shipping and you are in IL.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Response from OWC, Support June 16, 2021 Thanks for the feedback! We are always looking to improve in all areas and working with our shipping carriers will always be a priority. Hope to see you again soon!
Verified Buyer
Reviewer: JP-53499
Rating: 5/5 So far so good! June 14, 2021 Bought a 2020 27” iMac with 8GB RAM and before even turning it on had swapped it with four 16 GB RAM. Incredibly easy to do, it’s like putting bread in a toaster. Worked like a charm, have had no issues in month 1. Not that I would expect any. This was definitely the way to go versus paying Apple an extra $1200.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Response from OWC, Support June 15, 2021 We are pleased to hear that you were able to simply and successfully upgrade the RAM in your new 2020 iMac at a fair price! Thank you for being a part of our OWC family!
Verified Buyer
Reviewer: ZanyChinchilla-83963
Rating: 5/5 Great purchase June 12, 2021 The ram I purchased for my 2020 iMac 27” works great, was delivered when promised, and was 1/4 the cost of Apple’s ram. Thank you!

I would recommend this item to a friend! This review is from 16.0GB (2x 8GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: WanderingLion-20940
Rating: 5/5 all works well June 11, 2021 It was very easy to identify the right RAM for my iMac. Paid using my Amazon account and all went as expected.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Response from OWC, Support June 15, 2021 We are so glad to hear that you were able to easily locate the RAM for your iMac and that you were able to successfully place your order!!
Verified Buyer
Reviewer: Guitarboy
Rating: 5/5 Excited June 11, 2021 Calling MacSales was a pleasure as they made sure that all of my questions were answered. Their prices & service are great & going from 8gb to 72gb is awesome an awesome improvement. I will order from them again & highly recommend others to check them out. Thanks for a great experience.

I would recommend this item to a friend! This review is from 32.0GB OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade.

Verified Buyer
Reviewer: FaithfulMinnow-87390
Rating: 5/5 Great product. Great price. June 9, 2021 Videos make a huge difference!

I would recommend this item to a friend! This review is from 16.0GB (2x 8GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: EagerBobcat-88263
Rating: 5/5 Very Easy upgrade ! June 8, 2021 Excellent Product. Almost a third of price if bought from Apple Store!

I would recommend this item to a friend! This review is from 32.0GB OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade.

Verified Buyer
Reviewer: mike_wilk
Rating: 5/5 MacSales is my goto June 7, 2021 I'd be lost without MacSales. Expert videos and instructions on 'how to' and easy access to customer support. And at very reasonable prices. I upgraded the RAM on my new iMac and wow... it zips! I would recommend MacSales to anyone who needs parts and upgrades for their Apple computing products! High-quality products!

I would recommend this item to a friend! This review is from 64.0GB (2x 32GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: rlester18
Rating: 5/5 Only memory I ever buy June 7, 2021 This my 2nd kit for a 2nd Mac now they both cook!

I would recommend this item to a friend! This review is from 64.0GB (2x 32GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: lawrencemc
Rating: 5/5 The only place you should go for Mac stuff June 6, 2021 Been a customer forever, always amazing service, and quick delivery.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: Roberto
Rating: 5/5 Really good value June 5, 2021 I bought this to expand the memory in my new 2020 27" iMac from the stock 8GB.

I have owned several iMacs before and I have almost always upgrade the RAM using OWC parts.

Installed the 32GB and all is well and smooth.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: birdhaus-396
Rating: 5/5 I wish upgrading my own memory was this easy! June 3, 2021 My iMac is doing great with these modules! The installation was fast and easy.

I would recommend this item to a friend! This review is from 64.0GB (2x 32GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: GracefulAnteater-95385
Rating: 5/5 It's ram, it's works it's great June 2, 2021 It did exactly what I wanted and needed to, installation was simple and quality was top notch

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: Idiot_von_Idiot
Rating: 5/5 I thought the thing was fast before! June 2, 2021 I'd recently upgraded from an old Mac Pro tower which had 32GB, so I bought the 32GB upgrade for my 2018 Mac Mini. I can't imagine this "fixed" anything, but I was having some issues with the Apple wireless trackpad becoming sluggish when I started using virtual machines, and they have 100% disappeared after the RAM upgrade. I have a hard time believing that RAM could fix a mouse problem, but I've not had the issue once since upgrading.

I do a lot of photography retouching, music, and virtual machines, and this Mac Mini with 32GB is unstoppable. I was toying with going straight to 64GB, but so far I haven't even bumped into the 32GB. If I do, I know where to get 64.

Apple says the RAM isn't user-replaceable in the 2018 Mac Mini, but do yourself a favor; buy the necessary tools from iFixIt, and follow their videos. There's also a good video on 9to5Mac. I replaced mine in less than 20 minutes and couldn't be happier.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: GiftedFinch-77522
Rating: 5/5 Perfect Fit June 2, 2021 Instant upgrade for my new iMac. Saved hundreds of dollars over ordering new iMac with the same amount of RAM.

I would recommend this item to a friend! This review is from 32.0GB (4x 8GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: CharmingCat-31405
Rating: 5/5 Thanks. June 1, 2021 Huge upgrade in performance. Wonderful service.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: JimMiller
Rating: 5/5 Awesome Service May 28, 2021 I ordered additional memory for an iMac. It arrived in three days with a link to the install instructions. Had the memory installed in under 5 minutes with no issues

I would recommend this item to a friend! This review is from (*) 32.0GB (2x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: TenseDragon-63114
Rating: 5/5 Memory I needed May 27, 2021 Memory worked great, Mac is running faster! Fast delivery

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: KWBBL
Rating: 5/5 FAST DELIVERY, WORKS PERFECTLY May 26, 2021 GOOD GOOD COMPANY WILL DO BUSINESS AGAIN WITH THEM

I would recommend this item to a friend! This review is from 64.0GB (2x 32GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: SillyBeetle-97707
Rating: 5/5 Great Product May 25, 2021 Memory arrived on time and in excellent packaging. Extremely easy to install and works perfectly on my iMac retina 5k 27" 2019. I will definitely order through MacSales.com again.

I would recommend this item to a friend! This review is from 32.0GB (4x 8GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: PowerfulNightingale-27119
Rating: 5/5 Great price, very easy to install. May 25, 2021 Great price, and they were very easy to install.

I would recommend this item to a friend! This review is from 64.0GB (2x 32GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: AverageEarthworm-33939
Rating: 5/5 Great! May 25, 2021 I wanted to max out my iMac’s RAM and OWC is the place for that!

I would recommend this item to a friend! This review is from 64.0GB (2x 32GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: LongManatee-70451
Rating: 5/5 works great May 25, 2021 My mac is running at full speed with this memory.

I would recommend this item to a friend! This review is from 32.0GB (2x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: DarkOrangeGull
Rating: 5/5 Great Price, Fast Delivery May 24, 2021 It was simple. They had the RAM I needed, I ordered it and installed it.

I would recommend this item to a friend! This review is from 64.0GB (4x 16GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

Verified Buyer
Reviewer: GMc2021
Rating: 5/5 OWC memory chips worked perfectly - just like the last two memory upgrades. May 24, 2021 Easy iMac install. No problem!

I would recommend this item to a friend! This review is from 16.0GB (2x 8GB) OWC 2666MHz DDR4 PC4-21300 260-Pin SO-DIMM Memory Upgrade Kit.

OWC Memory 128.0GB 4 x 32GB PC4-21300 DDR4 Kit Mfr P/N: 2666DR4S128S OWC SKU: OWC2666DR4S128S OWC Memory Upgrade Kit Lifetime OWC Limited Warranty Ships: Same Day only $684.99
Add to CartOther World Computing 2666DR4S128S In Stock, Click to Buy Now
Additional Capacities & Kits: 8GB Modules
  • 16GB (2x8GB)
    • Ships: Same Day
    • Matched Kit for $94.99
  • 32GB (4x8GB)
    • Ships: Same Day
    • Matched Kit for $189.88
  • 8GB
    • Ships: Same Day
    • OWC Price $48.99
16GB Modules
  • 32GB (2x16GB)
    • Ships: Same Day
    • Only $199.90
    • Cyber Saver $175.99
  • 64GB (4x16GB)
    • Ships: Same Day
    • Only $399.80
    • OWC Price $349.99
  • 16GB
    • Ships: Same Day
    • Only $99.95
    • OWC Price $89.99
32GB Modules
  • 64GB (2x32GB)
    • Ships: Same Day
    • Only $599.98
    • Matched Kit for $344.99
  • 128GB (4x32GB)
  • 32GB
    • Ships: Same Day
    • Only $299.99
    • OWC Price $173.99
Mixed Modules