Sixth OS X El Capitan Beta Includes More Hints to 4K 21.5-Inch Retina iMac

Apple's sixth OS X 10.11 El Capitan beta, released on Monday, includes a few lines of code that yet again reference the possibility of a forthcoming 4K 21.5-inch Retina iMac, as discovered by Consomac [Google Translate]. A similar occurance happened back in June, when some code in the second OS X El Capitan beta referenced a 4K 21.5-inch iMac screen, but, as yet, Apple hasn't given any word on the veracity of the rumors.

Consomac's research into the code of the new OS X beta found three new files, two of which include screen resolutions that hint at the possible arrival of new 5K 27-inch iMacs, and the other with a 4096×2304 resolution. Like the second El Capitan beta, this code could potentially refer to a 21.5-inch Retina iMac display with 4K resolution coming down the line. Although, as Consomac discovered, an image accompanying the three files points to a design that will largely "remain unchanged" for the new line-up.

imac display code
Beginning last October, Apple launched a few updates for the 27-inch iMac with Retina Display, but the rest of the iMac line-up hasn't seen a proper upgrade since September 2013. The major reasoning behind the stalled upgrade cycle is the company waiting for Intel's various desktop components -- including the Broadwell and Skylake processors -- to be available for a more substantial update to Apple's smaller-sized desktop computer line-up.

An update to the 21.5-inch iMac line has been hinted at for a while now, including a rumor just yesterday from KGI Securities analyst Ming-Chi Kuo that pointed to the iMac line gaining a significant boost this quarter. Kuo points to display improvements with greater color saturation thanks to a few new processors, but never references directly the arrival of a retina display for the 21.5-inch iMac line. Still, the timing with back-to-school shopping swinging into gear, and the lengthy update cycle of the 21.5-inch line-up, definitely suggests an impending update for the model sometime soon.

Related Roundup: iMac
Buyer's Guide: iMac (Caution)
Related Forum: iMac

Popular Stories

Low Cost MacBook Feature A18 Pro

Apple Is Expected to Launch These Four MacBooks in 2026

Friday January 9, 2026 8:17 am PST by
2026 could be a bumper year for Apple's Mac lineup, with the company expected to announce as many as four separate MacBook launches. Rumors suggest Apple will court both ends of the consumer spectrum, with more affordable options for students and feature-rich premium lines for users that seek the highest specifications from a laptop. Subscribe to the MacRumors YouTube channel for more videos. ...
iPhone Top Left Hole Punch Face ID Feature Purple

10 Reasons to Wait for This Year's iPhone 18 Pro

Thursday January 8, 2026 2:56 am PST 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 18 Siri Personal Context

Apple Confirms Google Gemini Will Power Next-Generation Siri This Year

Monday January 12, 2026 7:38 am PST by
In a statement shared with CNBC today, Apple confirmed that Google Gemini will power the next-generation version of Siri that is slated to launch later this year. "After careful evaluation, we determined that Google's technology provides the most capable foundation for Apple Foundation Models and we're excited about the innovative new experiences it will unlock for our users," the statement...
Apple Creator Studio

Apple Introduces New 'Creator Studio' Bundle of Apps for $129 Per Year

Tuesday January 13, 2026 6:11 am PST by
Apple today introduced a new Apple Creator Studio bundle that offers access to six creative apps, as well as exclusive AI features and content, as part of a single subscription. In the U.S., pricing is set at $12.99 per month or $129 per year. Here are the six apps included with an Apple Creator Studio subscription:Final Cut Pro on the Mac and iPad Logic Pro on the Mac and iPad Pixelmator...
iOS 26

Here's What's New in iOS 26.3 So Far

Monday January 12, 2026 1:15 pm PST by
Apple today seeded the second beta of iOS 26.3, nearly a month after the first beta. So far, the update includes a couple of new features for iPhones. iOS 15.3 through iOS 18.3 were all released in late January over the years, so it is thereby likely that iOS 26.3 will be released towards the end of this month as well. The update is compatible with the iPhone 11 series and newer. Below,...
iOS 18 Siri Personal Context

Elon Musk Reacts to Apple and Google Teaming on Gemini-Powered Siri

Monday January 12, 2026 11:38 am PST by
Elon Musk today expressed concern about Apple and Google partnering on a more personalized version of Siri powered by Google's generative AI platform Gemini. "This seems like an unreasonable concentration of power for Google, given that [they] also have Android and Chrome," wrote Musk, in a post on X. Musk serves as CEO of xAI, the company behind Gemini competitor Grok. It is unlikely...
Apple Intelligence iPhone 16

Google Gemini Partnership With Apple Will Go Beyond Siri Revamp

Monday January 12, 2026 8:48 am PST by
Apple and Google today announced that Google Gemini will help power not only a more personalized version of Siri, but a range of future Apple Intelligence features. "Apple and Google have entered into a multi-year collaboration under which the next generation of Apple Foundation Models will be based on Google's Gemini models and cloud technology," the companies said, in a statement. "These...
iOS 26

iOS 26.2.1 Update Coming Soon for iPhones

Monday January 12, 2026 8:19 am PST by
iOS 26.3 will likely be released to the public later this month, but it appears that Apple is preparing to push out another software update in the interim. Apple's software engineers have started testing iOS 26.2.1, according to the MacRumors visitor logs, which have been a reliable indicator of upcoming iOS versions. The update will likely be released at some point this week or next week. ...

Top Rated Comments

JXShine Avatar
136 months ago
No standard SSD configuration, no buy.
Score: 11 Votes (Like | Disagree)
Small White Car Avatar
136 months ago
Fusion drive was a neat idea back in 2012, when SSD prices are still sky high. At the price apple is charging for its fusion drives in 2015, I can purchase a high capacity SSD.
The reality is, fusion drive, albeit faster than HDD alone, is still way slower than SSD.
So where is it you're buying 3 TB SSD drives from these days?
Score: 8 Votes (Like | Disagree)
Crosscreek Avatar
136 months ago
Like to see force touch trackpad and backlit keyboard also.
Score: 6 Votes (Like | Disagree)
manu chao Avatar
136 months ago
No standard SSD configuration, no buy.
I think you mean: 'No SSD configuration below X Dollars'. How would a cheaper non-SSD option change the value of the SSD option?
Score: 5 Votes (Like | Disagree)
tomaki Avatar
136 months ago
Imo 21.5" is too small. Apple should release 24" and 30" iMacs.
Score: 4 Votes (Like | Disagree)
JXShine Avatar
136 months ago
I bought my iMac when this form factor first came out in 2012. Maxed out the memory and opted for the fusion drive. It works great to this day. Even without retina, it is a really good machine. I also found that the fusion drive really did make things work faster and it was totally seamless. Having a multi-tier storage approach is not uncommon in the corporate world and it really should not be a turn-off in the home.
Fusion drive was a neat idea back in 2012, when SSD prices are still sky high. At the price apple is charging for its fusion drives in 2015, I can purchase a high capacity SSD.
The reality is, fusion drive, albeit faster than HDD alone, is still way slower than SSD.
Score: 4 Votes (Like | Disagree)