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

2024 iPhone Boxes Feature

Apple Adjusts Trade-In Values for iPhones, iPads, Macs, and More

Thursday November 6, 2025 11:12 am PST by
Apple today updated its trade-in values for select iPhone, iPad, Mac, and Apple Watch models. Trade-ins can be completed on Apple's website, or at an Apple Store. The charts below provide an overview of Apple's current and previous trade-in values in the U.S., according to its website. Maximum values for most devices either decreased or saw no change, but the iPad Air received a slight bump. ...
Liquid Glass General Feature

Apple Shares Liquid Glass Design Gallery

Thursday November 6, 2025 2:45 pm PST by
Apple is promoting the new Liquid Glass design in iOS 26, showing off the ways that third-party developers are embracing the aesthetic in their apps. On its developer website, Apple is featuring a visual gallery that demonstrates how "teams of all sizes" are creating Liquid Glass experiences. The gallery features examples of Liquid Glass in apps for iPhone, iPad, Apple Watch, and Mac. Apple...
iOS 26

iOS 26.1 Available Now With These 8 New Features

Monday November 3, 2025 5:54 am PST by
Following more than a month of beta testing, Apple released iOS 26.1 on Monday, November 3. The update includes a handful of new features and changes, including the ability to adjust the look of Liquid Glass and more. Below, we outline iOS 26.1's key new features. Liquid Glass Toggle iOS 26.1 lets you choose your preferred look for Liquid Glass. In the Settings app, under Display...
airtag purple

Apple's Website Lists AirTag 4-Pack at Shockingly Low Price [Updated]

Friday November 7, 2025 6:40 am PST by
Apple's online store in the U.S. is suddenly offering a pack of four AirTags for just $29, which is the same price as a single AirTag. This is likely a pricing error, and it is unclear if orders will be fulfilled. Apple has not discounted the AirTag four-pack in any other countries that we checked. Delivery estimates are already pushing into late November to early December, suggesting...
Finder Siri Feature

Apple's New Siri Will Be Powered By Google Gemini

Wednesday November 5, 2025 11:57 am PST by
The smarter, more capable version of Siri that Apple is developing will be powered by Google Gemini, reports Bloomberg. Apple will pay Google approximately $1 billion per year for a 1.2 trillion parameter artificial intelligence model that was developed by Google. For context, parameters are a measure of how a model understands and responds to queries. More parameters generally means more...
apple watch se 3 always on

Apple to Remove iPhone-Apple Watch Wi-Fi Sync in EU With iOS 26.2

Thursday November 6, 2025 4:37 am PST by
Apple in iOS 26.2 will disable automatic Wi-Fi network syncing between iPhone and Apple Watch in the European Union to comply with the bloc's regulations, suggests a new report. Normally, when an iPhone connects to a new Wi-Fi network, it automatically shares the network credentials with the paired Apple Watch. This allows the watch to connect to the same network independently – for...
ikea smart home devices

IKEA Debuts 21 HomeKit-Compatible Smart Bulbs, Sensors, and Controls

Thursday November 6, 2025 4:08 pm PST by
IKEA today announced the upcoming launch of 21 new Matter-compatible smart home products that will be able to interface with HomeKit and the Apple Home app. There are sensors, lights, and control options, all of which will be reasonably priced. Some of the products are new, while some are updates to existing lines that IKEA previously offered. There are a series of new smart bulbs that are...
apple tv logo physical

New Apple TV Intro Was Made With Practical Effects

Thursday November 6, 2025 7:02 am PST by
The all-new intro sequence for Apple TV was made with practical effects and shot in-camera, Ad Age reports. Rather than using digital techniques, the new sequence was made by shooting large glass versions of the Apple TV logo, with physical motion and changing lighting used to create effects. Apple partnered with TBWA\Media Arts Lab to create the intro. Ad Age released an exclusive look...
Home Hub Command Center with Dome Base Feature

Apple's 2026 Smart Home Revamp: All the Rumors

Wednesday November 5, 2025 3:54 pm PST by
It's been over a decade since Apple's HomeKit smart home platform launched, and it is overdue for an update. HomeKit and the Home app can no longer keep up with AI-powered solutions from other companies like Google and Amazon, but that's set to change with a smart home revamp that Apple has planned for 2026. Home Hub Apple is working on a home hub or "command center" that will serve as a...