Upgrading an iMac Pro to 256GB of RAM Only Possible at Time of Purchase [Updated]

Update: Despite what Apple's internal document stated, OWC has released an aftermarket 256GB memory upgrade kit for the iMac Pro for $2,499.



Last week, Apple added a 256GB RAM configure-to-order option for the iMac Pro. Unfortunately, if you already purchased an iMac Pro with 128GB of RAM or less, upgrading to 256GB does not appear to be possible.


The new 256GB RAM option consists of four 64GB memory modules, and in an internal document distributed to Apple Stores and Apple Authorized Service Providers, Apple states that the new configured-to-order ‌iMac Pro‌ is the only model designed to work with those 64GB memory DIMMs. No reason is provided.

This information suggests that Apple Authorized Service Providers will not be able to upgrade an ‌iMac Pro‌ to 256GB of RAM, nor will third-parties like OWC. In other words, purchasing an ‌iMac Pro‌ with 256GB of RAM will only be possible via the CTO option on Apple's online store during the checkout process.

256GB of RAM is a $5,200 upgrade option on Apple's online store, in addition to the ‌iMac Pro‌'s base $4,999 price.

The standard iMac is a bit more fortunate, as OWC has confirmed that the new 27-inch models released last week can be upgraded with up to 128GB of RAM, despite maxing out at 64GB on Apple's online store.

Related Roundup: iMac Pro
Buyer's Guide: iMac Pro (Don't Buy)

Top Rated Comments

(View all)
Avatar
19 months ago
Should Apple retire the 'Pro' name. It's obvious they can't deliver. Sad, really... And I cling to my Macpro4,1 hoping it lasts a few more years.

EDIT: My point is that 'Pro's' need flexibility. If there is no physical way to upgrade the system, then it's either buy top of the line, or look elsewhere. The closed agenda has to be costing them some users, one would think...
Score: 36 Votes (Like | Disagree)
Avatar
19 months ago
Surprise! Who'd have thought Apple would pull more of this ****?!
Score: 29 Votes (Like | Disagree)
Avatar
19 months ago

Oh no! Limited to a plebian 128GB of RAM on the most RAM-efficient OS available! What ever will we do? /s

In desktops, RAM is mostly needed for apps not OS.
Score: 27 Votes (Like | Disagree)
Avatar
19 months ago

"Pro" stands for "proficient"

Or 'PROfit' as people have to upgrade to get more memory?
Score: 22 Votes (Like | Disagree)
Avatar
19 months ago
I'm not sure what professionals are in the market for an iMac Pro if they need 256 Gig. Until Apple comes out with a revised Mac Pro, I would probably looking at non-Apple solution for a lot less money.
Score: 21 Votes (Like | Disagree)
Avatar
19 months ago
Oh no! Limited to a plebian 128GB of RAM on the most RAM-efficient OS available! What ever will we do? /s
Score: 17 Votes (Like | Disagree)

Top Stories

Here's How You Can Download iOS 14 and iPadOS 14 Around the World [It's Out]

Wednesday September 16, 2020 2:36 am PDT by
Apple's official public release of iOS 14 and iPadOS 14 dropped on Wednesday, September 16, just a day after the company released the Golden Master to third-party developers. Also set to be made available to the general public for the first time are watchOS 7 and tvOS 14. Getting Started With iOS 14 Video Click image to watch iOS 14 Getting Started While that's left a lot of developers...

When Will the iPhone 12 Launch? Here's What We Know

Wednesday September 16, 2020 6:12 am PDT by
Yesterday's "Time Flies" Apple event saw the release of the Apple Watch Series 6, Apple Watch SE, iPad 8, and iPad Air 4, but no new iPhone models. Rumors before the event strongly alleged that it would not see the unveiling of new iPhones, with many reports pointing to an October launch. The lack of new iPhone models yesterday seems to confirm that the iPhone 12 lineup will not appear...

Apple Releases iOS 14 and iPadOS 14 With Home Screen Redesign, App Library, Compact UI, Translate App, Scribble Support, App Clips, and More

Wednesday September 16, 2020 12:48 pm PDT by
Apple has released iOS 14 and iPadOS 14, the newest operating system updates designed for the iPhone and iPad. As with all of Apple's software updates, iOS 14 and iPadOS 14 can be downloaded for free. iOS 14 is available on the iPhone 6s and later, while iPadOS 14 is available on the iPad Air 2 and later. The updates are available on all eligible devices over-the-air in the Settings app. To ...

Apple Updates AirPods 2 and AirPods Pro Firmware to Version 3A283

Monday September 14, 2020 11:24 am PDT by
Apple today released new 3A283 firmware updates for the second-generation AirPods and the AirPods Pro. The second-generation AirPods are being updated from the 2D15 firmware they were previously running, while the AirPods Pros are being updated from the 2D27 firmware they had installed previously. Apple does not provide details on what's included in refreshed firmware so we don't know what's ...

Spotify Says Apple One Bundle Will Cause 'Irreparable Harm to Developer Community'

Tuesday September 15, 2020 12:26 pm PDT by
Apple today announced Apple One, a series of new subscription bundles that provide access to various Apple services at a combined monthly price. In response, Spotify sent out statements (via Peter Kafka) to the press decrying Apple's anti-competitive behavior and calling on "competition authorities" to stop Apple before it is able to cause "irreparable harm" to developers.Once again, Apple...

iOS 14, iPadOS 14, watchOS 7, and tvOS 14 Will Be Released September 16

Tuesday September 15, 2020 11:06 am PDT by
Apple today announced that iOS 14, iPadOS 14, watchOS 7, and tvOS 14 will be officially released on Wednesday, September 16. Apple has seeded the final Golden Master beta versions of each update to developers in advance. ‌iOS 14‌ and iPadOS 14 introduce dozens of new features, including a redesigned Home Screen that supports widgets on the iPhone and iPad for the first time. For more...

New AirPods Pro Firmware Introduces Spatial Audio Support and Automatic Switching

Monday September 14, 2020 12:22 pm PDT by
The new 3A283 firmware that Apple released for the AirPods Pro today appears to introduce support for Spatial Audio, a new feature coming to the higher-end AirPods with iOS 14. Multiple reports on Twitter and the MacRumors forums indicate that the firmware update adds a "Spatial Audio" option to the Control Center, which can be activated to enable the feature. Note that using Spatial Audio...

Apple Releases Safari 14 for Mac Ahead of macOS Big Sur Launch

Wednesday September 16, 2020 1:40 pm PDT by
macOS Big Sur didn't launch alongside iOS 14, iPadOS 14, tvOS 14, and watchOS 7 today, with the update coming later this fall, but Apple did release the Safari 14 update for macOS Catalina and macOS Mojave users. Safari 14 brings improved performance, customizable start pages, a Privacy Report to see which cross-site trackers are being blocked, and a new tab bar design that provides tab...

Full Transcript of Apple's 'Time Flies' Event With Apple Watch and iPad Updates

Tuesday September 15, 2020 8:46 am PDT by
Apple's virtual "Time Flies" event kicks off today at 10:00 a.m. Pacific Time, with Apple expected to debut new Apple Watch and iPad models, but it appears we may not see the iPhone 12 until next month. While we're not expecting to see new iPhones today, Apple's software updates for its various platforms are likely nearly ready for launch, so we may be hearing more about them today. Check...

Everything Apple Announced at Today's iPad and Apple Watch Event in Just Seven Minutes

Tuesday September 15, 2020 2:19 pm PDT by
Apple today held its annual September event, but this year was a bit different because no new iPhones were announced. The "Time Flies" event focused on the Apple Watch Series 6 and the iPad Air, and saw the debut of a new Apple One services bundle. Subscribe to the MacRumors YouTube channel for more videos. It took Apple an hour to introduce the new devices, but we've recapped the event in...