Apple on Tuesday unveiled new iMac models that support up to 64GB RAM. Apple charges high prices for RAM upgrades, though, but luckily, there are do-it-yourself options for replacing an ‌iMac‌'s memory after purchase.

Other World Computing this week announced memory upgrade kits designed for the 2019 27-inch 5K iMacs, which let you upgrade your available RAM more affordably.

27inchimac 1
There are three RAM kits available depending on your needs:

- 16GB Kit (8 GB x 2) OWC2666DDR4S16P - $118.88

- 32GB Kit (16GB x 2) OWC2666DDR4S32P - $229.88

- 64GB Kit (16GB x 4) OWC2666DDR4S64S - $449.99

OWC's RAM kits let you save 40 to 60 percent over Apple's upgrade pricing, and there is an option to trade in the existing RAM in your machine to get a discount.

OWC says that it is testing 128GB of memory in the 27-inch ‌iMac‌ models and will confirm whether or not the machine supports it in the near future. So far, the 27-inch ‌iMac‌ has been able to see 128GB of memory, which seems promising for even further RAM upgrades. OWC offers a lifetime limited warranty for its memory kits, along with a 30 day money back guarantee.

Note: MacRumors is an affiliate partner with OWC. When you click a link and make a purchase, we may receive a small payment, which helps us keep the site running.

Tag: OWC

Top Rated Comments

tevion5 Avatar
87 months ago
Can't recommend OWC enough. Just got a 256GB SSD upgrade for my aging Power Mac G5 Quad. Timely delivery and good prices. Their continued support for older Macs especially is fantastic.
Score: 7 Votes (Like | Disagree)
pavelbure Avatar
87 months ago
As tempting as it may be to save a few bucks, keep your old ram. You never know when you may have to get your iMac repaired or replaced.
Score: 6 Votes (Like | Disagree)
RyanXM Avatar
87 months ago
As tempting as it may be to save a few bucks, keep your old ram. You never know when you may have to get your iMac repaired or replaced.
Replacing your RAM with third party RAM DOES NOT, I repeat DOES NOT, void your warranty or AppleCare+. If an employee at a store tells you this, they are flat out LYING. I know this as I previously worked at an Apple Store. If they find that your RAM is causing an issue, their Family Room Team ie. Genius Bar, should have test RAM (Known Good) to ensure that all other components are functioning.
Score: 6 Votes (Like | Disagree)
MauiPa Avatar
87 months ago
I feel like the RAM in the 2019 model is literally interchangeable with the RAM in the 2017 model. Literally the only change in these 2019 iMacs is a new processor and a new GPU option. iFixIt, prove me wrong.
if you read a spec sheet, you don't need ifixit to tear it down. The spec for the 2017 27 iMac is

Technology: DDR4 SO-DIMM 260 Pin
Density: 4 x 16GB (16384MB)
RoHS: Yes
Pin Count: 260-pin
Op. Temp.: 0C to +85C
Data Rate: DDR4-2400
Speed: PC4-19200
CL: 17
Voltage: 1.2V
ECC: Non ECC

while the 2019 iMac is \
Technology: DDR4 SO-DIMM 260 Pin
Density: 4 x 16GB (16384MB)
RoHS: Yes
Pin Count: 260-pin
Op. Temp.: 0C to +85C
Data Rate: DDR4-2666
Speed: PC4-21300
Voltage: 1.2V

This is from OWC. Will it work? Hey its different, the 2017 is slower, beyond that, ask google
Score: 3 Votes (Like | Disagree)
B4U Avatar
87 months ago
Replacing your RAM with third party RAM DOES NOT, I repeat DOES NOT, void your warranty or AppleCare+. If an employee at a store tells you this, they are flat out LYING. I know this as I previously worked at an Apple Store. If they find that your RAM is causing an issue, their Family Room Team ie. Genius Bar, should have test RAM (Known Good) to ensure that all other components are functioning.
To add to the point, I have an out of warranty iMac with the OWC RAM and needed a repair. The genius bar guys took a look and still performed all the necessary repair with those RAM in place.
Score: 2 Votes (Like | Disagree)
Guyp16 Avatar
87 months ago
Replacing your RAM with third party RAM DOES NOT, I repeat DOES NOT, void your warranty or AppleCare+. If an employee at a store tells you this, they are flat out LYING. I know this as I previously worked at an Apple Store. If they find that your RAM is causing an issue, their Family Room Team ie. Genius Bar, should have test RAM (Known Good) to ensure that all other components are functioning.
I’m ex Apple too and can confirm RyanXM’s points.
Score: 2 Votes (Like | Disagree)

Popular Stories

ios 26 1 slide to stop

iOS 26.1 Brings Back 2007 Feature in New Way

Friday October 31, 2025 1:40 pm PDT by
The upcoming iOS 26.1 update includes a small but helpful change for iPhones, and it could prevent you from running late to something important. Specifically, when an alarm goes off in the Clock app, there is a new "slide to stop" control on the screen for turning off the alarm. On previous iOS 26 versions, there is simply a large "stop" button, which could be accidentally tapped. The new ...
M5 MacBook Pro

Waiting for New Macs? Apple Just Shared Bad News

Friday October 31, 2025 7:32 am PDT by
Apple has just given a strong indication that it will not be releasing any additional new Macs for the remainder of the year. Apple's CFO Kevan Parekh dropped the hint during the company's earnings call on Thursday:On Mac, keep in mind, we expect to face a very difficult compare against the M4 MacBook Pro, Mac mini, and iMac launches in the year-ago quarter.Parekh essentially gave a heads up ...
iPhone 17 Pro Cosmic Orange

8 Reasons to Wait for Next Year's iPhone 18 Pro

Thursday October 30, 2025 4:42 am PDT by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...
iOS 26

6 New Things Your iPhone Can Do in iOS 26.1

Wednesday October 29, 2025 4:22 am PDT by
Apple is about to drop iOS 26.1, the first major point release since iOS 26 was rolled out in September, and there are at least six notable changes and improvements to look forward to. We've rounded them up below. Apple has already provided developers and public beta testers with the release candidate version of iOS 26.1, which means Apple will likely roll out the update to all compatible...
Apple Foldable Thumb

iPhone Fold: Launch, Pricing, and What to Expect From Apple's Foldable

Friday October 31, 2025 8:52 am PDT by
Apple is expected to launch a new foldable iPhone next year, based on multiple rumors and credible sources. The long-awaited device has been rumored for years now, but signs increasingly suggest that 2026 could indeed be the year that Apple releases its first foldable device. Below, we've collated an updated set of key details that have been leaked about Apple's foldable iPhone so far. Ove...
Coffee Burgundy and Purple iPhone 18 Pro Mock 1

Leaker Outlines Potential New Colors for iPhone 18 Pro

Friday October 31, 2025 8:28 am PDT by
Apple's iPhone 18 Pro models could be available in new rich and warm color option, according to a known leaker. The Weibo user known as "Instant Digital" today suggested that next-year's iPhone 18 Pro models will be available in at least one of the following color options: Coffee, purple, and burgundy. The iPhone XR, iPhone 11, iPhone 12, iPhone 14, and iPhone 14 Pro were all available in ...
apple tv hd

Apple Launched Its Big New Vision for TV 10 Years Ago Today

Thursday October 30, 2025 8:58 am PDT by
Apple launched the Apple TV HD, the Siri Remote, tvOS, and their accompanying App Store a decade ago today, marking a major overhaul of the device. The new vision for the Apple TV was unveiled on September 9, 2015 during Apple's "Hey Siri" event in San Francisco, where CEO Tim Cook introduced the device with the statement, "The future of TV is apps." The announcement represented a major...
iOS 26

Apple This November: iOS 26.2 Beta, Rumored New Products, and More

Thursday October 30, 2025 12:42 pm PDT by
Tomorrow is Halloween, and then November is upon us. Below, we outline what to expect from Apple next month, as the slower holiday season approaches. Apple is expected to kick off November by releasing iOS 26.1, iPadOS 26.1, macOS 26.1, watchOS 26.1, tvOS 26.1, and visionOS 26.1. With beta testing now wrapped up, the updates will likely be released this Monday, November 3 or Tuesday,...
iOS 26

iOS 26.1 Coming Soon: New Features for Your iPhone and Release Date

Monday October 27, 2025 7:55 am PDT by
The upcoming iOS 26.1 update includes a handful of new features and changes for iPhones, including a toggle for changing the appearance of the Liquid Glass design, "slide to stop" for alarms in the Clock app, and more. Below, we outline key details about iOS 26.1. Release Date Given that Apple has yet to seed an iOS 26.1 Release Candidate, which is typically the final beta version, the...
maxresdefault

Apple TV 4K Could Still Launch Before 2025 Ends: All the Rumored Features

Monday October 27, 2025 4:51 pm PDT by
Apple is designing an updated version of the Apple TV 4K, and rumors suggest that it could come out sometime in the next couple of months. We're not expecting a major overhaul with design changes, but even a simple chip upgrade will bring major improvements to Apple's set-top box. Subscribe to the MacRumors YouTube channel for more videos. We've rounded up all the latest Apple TV rumors. ...