OS X 10.10.3 Now Supports Dell's Dual-Cable 5K Monitor on Retina iMac and Mac Pro

With the release of OS X 10.10.3 last Wednesday, Apple has expanded support for high-resolution 4K and even 5K external displays (via 9to5Mac). Most notably, OS X 10.10.3 enables the Retina 5K iMac and 2013 Mac Pro to drive Dell's UP2715K 27-inch 5K display released late last year. The display requires more bandwidth than is currently supported over a current single DisplayPort/Thunderbolt cable, so it uses a dual-cable solution taking up two ports on the user's machine.

dell_up2715k_5k
This bandwidth issue for the current DisplayPort standard has been seen as a major roadblock keeping Apple from releasing a standalone 5K Thunderbolt Display. With the Retina iMac, Apple has been able to build custom internal components to drive the massive display, but for external displays, a dual-cable solution such as that used by Dell has been considered by many to be "un-Apple like."

As a result, Apple has been widely expected to wait until the release of Intel's Skylake platform with DisplayPort 1.3 support later this year before releasing an external 5K Thunderbolt Display that will function over a single cable. Whether the inclusion of support for Dell's dual-cable solution in OS X 10.10.3 is a sign Apple may be willing to adopt that arrangement for its own display and perhaps release it earlier is, however, unclear.

Beyond 5K displays, OS X 10.10.3 has also expanded support for 4K displays to include "most single-stream 4K (3840x2160) displays" at 60 Hz, expanding beyond the previous support of only Multi-Stream Transport displays introduced in late updates to Mavericks. The new 4K display support will function with most of the Mac line, from the 27-inch iMac to the brand-new Retina MacBook. However, only the Mac Pro and iMac will support full 4096x2160 resolution at 60Hz.

With OS X Yosemite v10.10.3, most single-stream 4K (3840x2160) displays are supported at 60Hz operation on the following Mac computers:

- MacBook Pro (Retina, 13-inch, Early 2015)
- MacBook Pro (Retina, 15-inch, Mid 2014)
- Mac Pro (Late 2013)
- iMac (27-inch, Late 2013 and later)
- Mac mini (Late 2014)
- MacBook Air (Early 2015)
- MacBook (Retina, 12-inch, Early 2015)

As for the new 12-inch MacBook, the laptop will be able to support displays and rates of 3840x2160 at a 30 Hz refresh rate and 4096x2160 at a 24 Hz refresh rate. MacBook users wanting to use such a display will, of course, need to use Apple's USB-C Digital AV Multiport Adapter to do so.

Related Roundups: iMac, Mac Pro, Apple Pro Display XDR

Top Rated Comments

MTW Avatar
78 months ago


- WORST OF ALL: it almost never wakes from sleep (and powering on/off) won't help. You basically have to power down your ENTIRE MAC every time you walk away, because otherwise you'll end up blind and having to force-shutdown. Which I've done many times, and yes, data loss can result. Only a full boot will make a picture appear reliably..
Hi. Long time reader, zero time commenter. Registered as I know the solution to the problem you're having!

Check your revision sticker on the back of your monitor. Dell did a silent update to that monitor to fix the issues you describe. They come from a buggy MST implementation - most 4k monitors shipped early on have that problem. If your revision is A00 call Dell support. They will need to replace the whole monitor for you. You'll get the A01 revision, which has that bug fixed.

As a bonus, you'll get a new stand (which doesn't sit on a weird angle)

One more thing: the P2415Q exists now. Much cheaper ($400) and doesn't use MST at all - so absolutely zero MST weirdness. Just like a normal monitor.
Score: 13 Votes (Like | Disagree)
SpiderDude Avatar
78 months ago
"- MacBook (Retina, 12-inch, Early 2015)"

Dual 5k monitors on an intel M core.
That oughta be fun...
Score: 11 Votes (Like | Disagree)
bugout Avatar
78 months ago
and dell is still charging 2499 for just the monitor.. Apple should add support to use a second 5k imac as a monitor.. it's the same damn price..
Score: 7 Votes (Like | Disagree)
MTW Avatar
78 months ago
Thanks! I've heard that, but I've also heard of the new revision NOT fixing the problem.

And I WILL get a used/refurb if I ask for that swap: more hairs and dust and scratches than the brand-new one came with. I've heard horror stories.

I'm still thinking of trying it, but with the solution being less than certain, I don't want to for now. (Plus I've heard Dell makes you pay for costly shipping?)
I had the UP2414Q before I upgraded. The revision fixed the problem for me. MST in and of itself is a dirty hack, a MST monitor will never operate quite like a SST monitor. Still, after the swap the weirdness should just be 'the monitor takes an extra second or two to wake after sleep'

AFAIK they come in retail packaging.

Dell does not make you pay for shipping.

You could always sell the UP2414Q and get the P2415Q. That one fixes most of your complaints, doubly so the MST-related ones. It doesn't pretend to have a metal finish anymore, it doesn't have touch buttons. Just all together better. I say 'sell' as the UP2414Q is, for reasons passing my understanding, selling for more than the P2414Q's MSRP. Maybe people really want that 'metal' housing?

Oh, and the UP2414Q will never work right on non-2013 Mac Pros (no MST support), but the P2415Q will work on any Mac Pro with a DisplayPort 1.2 GPU (a MacVidCards 7950/7970 being among the cheapest ways to get one)

Plug and play.


Yes, they do have one part-timer--and her job (which she did badly) was to copy this:

Image (http://origin.arstechnica.com/journals/apple.media/metalimac9.jpg)
Oh please. Dell's ports-on-back design predates that iMac even existing. Putting ports on the back of the display isn't even close to something Apple 'owns'. Apple may 'own' the ports facing straight out, I get that....but Dell displays have them facing down (an annoyance to anyone who needs to unplug something from their monitor)

Either way, that seems like a really silly thing to be screaming 'knockoff!' about.
Score: 6 Votes (Like | Disagree)
palebluedot Avatar
78 months ago
So... if you think a Dell is the display of your dreams, go in with low expectations. Expect a cheaply-made, unreliable stopgap until you can afford (and find!) something better.

I think you are wrong on this. Dell customer support for their high-end/pro monitors is equivalent to AppleCare/Apple customer support in my experience. I've personally had Dell go through 5 seperate monitors with me to make sure I found one with the gamut, lack of bleed, and angles I liked.

I've had just as many mfg defects in Apple products as Dell monitors and I've found both companies (with the exception of having to email Tim Cook to get something fixed once) easily stand behind their products. YMMV, but I think you may be an outlier there. Should have called Dell and gotten a new unit.
Score: 5 Votes (Like | Disagree)
kyjaotkb Avatar
78 months ago
"- MacBook (Retina, 12-inch, Early 2015)"

Dual 5k monitors on an intel M core.
That oughta be fun...

That's not what the article says: it says the Retina Macbook only supports 1 4K display up to 3840*2160 @30Hz.
Score: 5 Votes (Like | Disagree)

Top Stories

siir apple event april 20

Siri Reveals Apple Event Planned for Tuesday, April 20

Tuesday April 13, 2021 12:04 am PDT by
Siri has apparently prematurely revealed that Apple plans to hold an event on Tuesday, April 20, where the company is expected to reveal brand new iPad Pro models and possibly its long-awaited AirTags trackers. Subscribe to the MacRumors YouTube channel for more videos. Upon being asked "When is the next Apple Event," Siri is currently responding with, "The special event is on Tuesday, April...
apple event spring loaded

Apple's 'Spring Loaded' Event Officially Announced for Tuesday, April 20

Tuesday April 13, 2021 9:04 am PDT by
Following an overnight leak by Siri, Apple today officially announced that it will be holding a special "Spring Loaded" event on Tuesday, April 20 at 10:00 a.m. Pacific Time at the Steve Jobs Theater on the Apple Park campus in Cupertino, California. As with all of Apple's 2020 events, the April 2021 event will be a digital-only gathering with no members of the media invited to attend in...
pixel watch prosser leak

Google Pixel Watch Allegedly Leaks with Circular Design, Rumored to Launch in October

Monday April 12, 2021 2:49 am PDT by
Renders of Google's first smartwatch, codenamed "Rohan," have been shared by Jon Prosser, showing that Google plans to adopt a circular design for its flagship wearable watch. Prosser shared the renders in an episode of his YouTube show "Front Page Tech," in which he claims they were made based on marketing material he had seen from a source within Google. The renders show that the Pixel...
Google maps feaure green

Google Maps App for iOS Finally Updated After Four Months

Monday April 12, 2021 10:03 am PDT by
Following the completed rollout of App Privacy labels for its App Store apps, Google today updated the Google Maps app for the first time in four months. Apple in December began requiring all new app submissions and app updates to include App Privacy labels, detailing the data that is collected by the app so consumers know what they're sharing. Google didn't begin implementing App Privacy ...
AppleTV and HomePod Feature

Bloomberg: Apple Working on New Apple TV With Integrated HomePod Speaker and FaceTime Camera

Monday April 12, 2021 3:32 am PDT by
Apple is working on a combined Apple TV with HomePod speaker that has a camera for video calls through a connected television set, according to Bloomberg's Mark Gurman. From the report: The company is working on a product that would combine an Apple TV set-top box with a HomePod speaker and include a camera for video conferencing through a connected TV and other smart-home functions,...
samsung experience 1

Samsung's 'iTest' Lets You Try a Galaxy Device on Your iPhone

Thursday April 8, 2021 12:42 pm PDT by
Samsung has launched "iTest," an interactive website experience that's designed to allow iPhone users to test out Android on a Galaxy device, or "sample the other side," as Samsung puts it. Subscribe to the MacRumors YouTube channel for more videos. The iTest website is being advertised in New Zealand, according to a MacRumors reader who came across the feature. Visiting the iTest website on...
epic iap feature 3

Tim Cook Says App Store Would Become a 'Flea Market' if Third-Party Payment Systems Were Allowed

Monday April 12, 2021 9:41 am PDT by
In a recent interview with the Toronto Star, Apple CEO Tim Cook spoke about a wide variety of topics, ranging from App Tracking Transparency to Apple's ongoing legal battle over App Store policies with Fortnite creator Epic Games. Notably, Cook said that Epic Games' desire for Apple to let developers offer their own payment systems in apps "would make the App Store a flea market":At the...
tim cook toronto star

Tim Cook Says Apple is 'Not Against Digital Advertising' Ahead of iOS 14.5 Launch With App Tracking Transparency

Monday April 12, 2021 8:00 am PDT by
Starting with iOS 14.5, iPadOS 14.5, and tvOS 14.5, Apple will be requiring apps to receive a user's permission to track their activity for targeted advertising purposes, as part of a privacy measure known as App Tracking Transparency. Ahead of App Tracking Transparency being enforced, Apple CEO Tim Cook has participated in a privacy-focused interview with the Toronto Star, telling the...
a13 bionic mockup

Apple Made Sudden Security Changes to its Chips in Fall 2020

Monday April 12, 2021 8:15 am PDT by
Apple made unusual mid-production hardware changes to the A12, A13, and S5 processors in its devices in the fall of 2020 to update the Secure Storage Component, according to Apple Support documents. According to an Apple Support page, spotted by Twitter user Andrew Pantyukhin, Apple changed the Secure Enclave in a number of products in the fall of 2020:Note: A12, A13, S4, and S5 products...
HomePod G4 Feature

Bloomberg: Future HomePod May Feature iPad Connected Via Robotic Arm to Track Users Around The Room During FaceTime Calls

Monday April 12, 2021 3:50 am PDT by
In a report outlining a possible Apple TV with a combined HomePod and camera, Bloomberg's Mark Gurman says that Apple is exploring a future high-end HomePod speaker that could include an iPad connected via a robotic arm that tracks and follows users around a room. From the report: The Cupertino, California-based technology giant, is also mulling the launch of a high-end speaker with a touch ...