Retina 5K iMac Will Not Act as External Display, Standalone Apple 5K Display Unlikely Soon

At Apple's introduction of the new 27-inch iMac with Retina 5K Display, Phil Schiller noted that the machine's $2499 starting price compares favorably with some of the higher-end 4K displays on the market today for closer to $3000, leading some to wonder whether it would be feasible to use the iMac as an external display for something like a Mac Pro.

For a number of years, iMacs have supported a feature known as target display mode, which allows them to serve as external displays for other computers, but as pointed out by TechCrunch's Matthew Panzarino yesterday, the new Retina 5K iMac does not support this mode.

imac_retina_waterfall
The probable reason for this is also likely the reason why Apple did not announce a standalone Retina Thunderbolt Display yesterday: bandwidth limitations. The current DisplayPort 1.2 specification used over Thunderbolt 2 on Apple's latest Macs simply isn't capable of handling the bandwidth necessary for 5K video over a single cable.

As a result, no current Mac, including the Mac Pro and Retina MacBook Pro models that do support 4K displays, can currently drive a 5K external display. Technically, Apple could allow another Mac to output video at a lower resolution and have the Retina iMac scale the content up to fit its display, but this would not be ideal and Apple has apparently elected not to support it as an option.

As noted by Marco Arment, simple plug-and-play support for 5K external displays over a single cable will need the new DisplayPort 1.3 standard, but that won't be an option until Intel's Skylake platform, the successor to the upcoming Broadwell family, is launched.

Doing it right will require waiting until DisplayPort 1.3 in Thunderbolt 3 on Broadwell’s successor, Skylake, which isn’t supposed to come out for at least another year — and Intel is even worse at estimating ship dates than I am, so it’s likely to be longer. [...]

I’d estimate — granted, I’m wrong a lot — that Apple won’t ship a standalone 5K display until at least 2016, and it won’t work with any of today’s Macs, including the 2013 Mac Pro.

Arment points out that Dell's upcoming 5K display uses dual DisplayPort 1.2 cables for connectivity but that no current Macs appear to support the setup and even if they did performance would likely not be ideal.

Another potential product on the horizon is a Retina 21.5-inch iMac likely at 3840 x 2160 pixels, although it is unclear when Apple plans to launch such a machine. KGI Securities analyst Ming-Chi Kuo predicts a second half of 2015 launch for the machine in a similar pattern to that seen with the MacBook Pro, where the larger 15-inch model received a Retina display option a number of months before the 13-inch model followed suit.

Buyer's Guide: iMac (Caution)
Related Forums: iMac, Mac Accessories

Top Rated Comments

MacFather Avatar
104 months ago
Deleted.
Score: 36 Votes (Like | Disagree)
gugy Avatar
104 months ago
This sucks. I want a TB 5K now for my MacPro!
Score: 21 Votes (Like | Disagree)
nagromme Avatar
104 months ago
Best you can get today?

For my Mac Pro I went with a 24" Dell UP2414Q 4k display. 4k at larger sizes than 24" is just awkward: pixels too big to use at 2x, too small for 1x. But this Dell is just the right size to be a Retina display that works TODAY.

It looks terrific! And it has nice scaling options just like a retina MacBook Pro. No software to install--Apple supports this model specifically with scaling options not found on larger 4k displays.

However... you get what you pay for with Dell. Styling-wise this is not Dell's worst (clearly imitating the 2007 black-and-aluminum iMac design), but it is NOT close to Apple's display standards:

- No camera, no mic, no speakers, no Thunderbolt hub, audio ports, Ethernet, etc.; no powered USB, just an unpowered USB hub that loses power when the display isn't on.

- No option to adjust brightness automatically with an ambient light sensor. (Didn't realize how much I'd miss that.)

- Won't reliably wake from sleep!! And when it does wake, sometimes you get only half the screen. Keep trying.

- A few little bits of hair or dust between the layers. Looks like dead pixels, but it's not.

- Cheap painted silver plastic, combined with a few not-quite-matching thin panels of real aluminum.

- Gaps and cracks and creaks and flexes. Just feels cheap.

- Awkward touch controls that don't always work. Sometimes you have to press hard. Simply adjusting the brightness is a pain.

- Unreliable sensor that makes the controls' lights blink annoyingly.

- No protective glass--and thus risky and difficult to clean, and easy to bash with a box corner.

- Can't respond to the brightness keys on my keyboard.

- Shipped at an awful 30Hz and took research and hoop-jumping to enable 60Hz.

- Good warranty that might help with some of the above... except it's unbearably painful to deal with their support staff. Good luck with that.

- No magsafe to power your Mac laptop. This is not a dock for a MacBook the way Apple displays can function; but that's OK with a Mac Pro.

- Not a great black level, and uneven glowing backlight bleed around the edges when viewing dark images. Viewing angle is OK, not great.

- Generates a TON of heat! Ouch! My electric bill!

- Sits on a permanent, very slight diagonal in landscape (normal) mode: the portrait–landscape pivot won't quite rotate all the way to level.

But yet... when viewed head-on, it has awesome res and color! I'm glad I have it--there is no better option yet. Also, it goes to Portrait... sometimes. And it can go very bright! And if you play endless games looking for deals like I did, you can find a cheap price. (Or you can get sent the wrong thing and waste time and end up not getting such a good price... like I did.)

I use mine at a scaled res equivalent to 2304x1296. But it will go as high as 3008x1692 if you like to squint.
Score: 13 Votes (Like | Disagree)
JHankwitz Avatar
104 months ago
no 5k standalone soon?? well, why the **** not?!

Read the article.
Score: 10 Votes (Like | Disagree)
HenryDJP Avatar
104 months ago
better throw away that 5k monitor/computer in 5 years when 5k finally becomes a standard.

Well in 5 years I'm sure many people will upgrade to the latest model of this machine anyway.

I guess Apple wants the Mac Pro users to get a 3rd party 4K display. Not a problem. Not everybody has to have an actual Apple display to use the Mac Pro.
Score: 10 Votes (Like | Disagree)
calaverasgrande Avatar
104 months ago
I'm not going to say 'applefail' or 'if steve was still alive'.
But it just seems like Apple is pretty smug lately, flipping the finger to the people who buy their stuff on the regular.
You own a Mac Pro? Our most expensive item? Look elsewhere for a monitor for it, we can't be bothered.
But look at how thin our ipad is!
Score: 8 Votes (Like | Disagree)

Popular Stories

apple watch ultra deuglify 1

Apple Watch Ultra User Mods Titanium Casing to 'Deuglify' Design

Tuesday September 27, 2022 8:05 am PDT by
An Apple Watch Ultra user has modified their new device's casing to add a brushed finish and remove the orange color of the Action Button in an effort to make it more visually appealing. The Apple Watch Ultra offers the first complete redesign of the Apple Watch since the product line's announcement in 2014, and while the design has been met with praise from many users, some have criticized...
Dark Sky App Featured

Dark Sky Removed From iOS App Store Ahead of Upcoming Shutdown

Wednesday September 28, 2022 4:27 pm PDT by
The Dark Sky weather app that's owned by Apple is no longer available for download in the U.S. App Store, suggesting that it has been removed ahead of schedule. Apple acquired Dark Sky back in March 2020 and has since incorporated elements of the app into the Weather app available on the iPhone (and soon, the iPad). Dark Sky remained available for purchase as a standalone weather app...
iphone 14 pro max vs 13 max 2

Camera Comparison: iPhone 14 Pro Max vs. iPhone 13 Pro Max

Thursday September 29, 2022 7:44 am PDT by
The iPhone 14 Pro and Pro Max introduce some major improvements in camera technology, adding a 48-megapixel lens and low-light improvements across all lenses with the new Photonic Engine. We've spent the last week working on an in-depth comparison that pits the new iPhone 14 Pro Max against the prior-generation iPhone 13 Pro Max to see just how much better the iPhone 14 Pro Max can be. Subscrib ...
apple watch ultra hammer test

YouTuber Tests Apple Watch Ultra Durability With a Hammer: Table Breaks Before the Watch

Sunday September 25, 2022 2:27 pm PDT by
A YouTuber has put Apple's claims for the durability of the Apple Watch Ultra to the test by putting it up against a drop test, a jar of nails, and repeated hits with a hammer to test the sapphire crystal protecting the display. TechRax, a channel popular for testing the durability of products, first tested the Apple Watch Ultra by dropping it from around four feet high. The Apple Watch...
tony blevins car

Apple Procurement VP Departs Company After Vulgar TikTok Comment

Thursday September 29, 2022 12:38 pm PDT by
Tony Blevins, Apple's vice president of procurement, is set to depart the company after he made a crude comment about his profession in a recent TikTok video, reports Bloomberg. Blevins was in a video by TikTok creator Daniel Mac, who was doing a series on the jobs of people he spotted with expensive cars. After seeing Blevins in an expensive Mercedes-Benz SLR McLaren, Mac asked Blevins what ...
iPhone 14 Pros in Hand Black Background Feature

Verizon iPhone 14 Pro Customers Reporting Cellular Connection Issues

Monday September 26, 2022 6:23 am PDT by
iPhone 14 Pro customers on the Verizon network in the U.S. are reporting issues with slow and unreliable 5G cellular connections and calls randomly dropping. Several threads on Reddit (1,2,3) and the MacRumors forums chronicle issues faced by Verizon customers and Apple's latest iPhone. According to user reports, signal strength on the iPhone 14 Pro is unreliable and weak, while other...
iPhone 15 to Switch From Lightning to USB C in 2023 feature sans arrow

Kuo: iPhone 14 Pro Max Popularity Could Lead to More Differentiation Between iPhone 15 Pro and iPhone 15 Pro Max

Wednesday September 28, 2022 10:22 am PDT by
Apple has seen high demand for the 6.7-inch iPhone 14 Pro Max, which could lead the company to further differentiate the next-generation iPhone 15 Pro and Pro Max, according to Apple analyst Ming-Chi Kuo. Apple could add exclusive features to the iPhone 15 Pro Max in an effort to encourage more people to purchase the larger and more expensive device. Kuo last week said that Apple asked...
iPhone 14 Pro Sports Scores Dynamic Island

iPhone 14 Pro Features Live Sports Scores in Dynamic Island on iOS 16.1

Monday September 26, 2022 7:52 am PDT by
Earlier this month, Apple announced that iOS 16.1 will enable a new Live Activities feature that allows iPhone users to stay on top of things that are happening in real time, such as a sports game or a food delivery order, right from the Lock Screen. On the iPhone 14 Pro and Pro Max, Live Activities also integrate with the Dynamic Island. Premier League match in Dynamic Island via Paul Bradford ...
iOS 16

Everything New in the Latest iOS 16.1 and iPadOS 16.1 Betas: Stage Manager Expansion, Wallpaper Tweaks and More

Tuesday September 27, 2022 11:36 am PDT by
Apple today released new betas of iOS 16.1 and iPadOS 16.1 to developers, tweaking some of the functionality that's been introduced in prior betas and in the case of iPadOS 16.1, adding a major new feature to Stage Manager. We've rounded up everything new in both betas below. Wallpaper Updates Apple has updated the Wallpaper section of the Settings app to allow users to swap between...
General iOS 16 Feature Yellow

Some iOS 16 Users Continue to Face Unaddressed Bugs and Battery Drain Two Weeks After Launch

Monday September 26, 2022 7:34 am PDT by
Today marks exactly two weeks since Apple released iOS 16 to the public. Besides the personalized Lock Screen, major changes in Messages, and new features in Maps, the update has also seen its fair share of bugs, performance problems, battery drain, and more. After major iOS updates, it's normal for some users to report having issues with the new update, but such reports usually subside in...