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

(View all)
Avatar
72 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)
Avatar
72 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)
Avatar
72 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)
Avatar
72 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)
Avatar
72 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)
Avatar
72 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

Early iPhone 12 Tests Show Ceramic Shield is Stronger and More Scratch Resistant Than iPhone 11 Glass

Friday October 23, 2020 1:21 pm PDT by
Apple's new iPhone 12 models are protected by a Ceramic Shield cover glass that has nano-ceramic crystals infused right into the glass to improve durability. According to Apple, Ceramic Shield offers four times better drop protection than the glass used for the iPhone 11 models. YouTube channel MobileReviewsEh conducted some tests on the iPhone 12 using a force meter to compare its performance ...

iPhone 12 Pro Allows You to Measure Someone's Height Instantly Using LiDAR Scanner

Saturday October 24, 2020 11:12 am PDT by
iPhone 12 Pro models feature a new LiDAR Scanner for enhanced augmented reality experiences, but the sensor also enables another unique feature: the ability to measure a person's height instantly using the Measure app. You can even measure the seated height of a person in a chair, according to Apple. When the Measure app detects a person in the viewfinder, it automatically measures their...

Google Reportedly Pays Apple $8-12 Billion Per Year to be Default iOS Search Engine

Sunday October 25, 2020 2:59 pm PDT by
The United States Justice Department is targeting a lucrative deal between Apple and Google as part of one of the U.S. government's largest antitrust cases, reports The New York Times. On Tuesday, the Justice Department filed an antitrust lawsuit against Google, claiming the Mountain View-based company used anticompetitive and exclusionary practices in the search and advertising markets to ...

Apple References Unreleased 2020 16-Inch MacBook Pro in Boot Camp Update

Monday October 26, 2020 8:42 am PDT by
Last week, Apple released an update for Boot Camp, its utility for running Windows on a Mac. While this update would typically be unremarkable, several of our readers noticed that the release notes reference an unreleased 2020 model of the 16-inch MacBook Pro. While this could easily be a mistake, the 16-inch MacBook Pro is nearly a year old, so it is certainly a worthy candidate for a...

Apple Warns MagSafe Charger Can Leave Circular Imprints on Leather Cases

Friday October 23, 2020 3:23 pm PDT by
If you keep your iPhone in a leather case while charging with Apple's new MagSafe Charger, the case might show circular imprints from contact with the accessory, according to a new Apple support document published today. Apple's leather cases for the iPhone 12 and iPhone 12 Pro are not available until November 6, but a MacRumors reader has already shared a photo of a circular imprint on...

iPhone 11 Pro Outlasts iPhone 12 and 12 Pro in Extensive Battery Life Test

Friday October 23, 2020 8:36 am PDT by
Arun Maini today shared a new side-by-side iPhone battery life video test on his YouTube channel Mrwhosetheboss, timing how long the new iPhone 12 and iPhone 12 Pro models last on a single charge compared to older models, with equal brightness, settings, battery health, and usage. All of the devices are running iOS 14 without a SIM card inserted. In the test, the iPhone 11 Pro outlasted both ...

PSA: Non-iPhone 12 Models Charge Super Slowly With MagSafe Charger

Friday October 23, 2020 4:11 pm PDT by
Alongside the iPhone 12 models, Apple introduced a new $39 MagSafe Charger that's meant to work with the magnets in the iPhone 12 Pro models to charge them up at a maximum of 15W. The MagSafe Charger is technically able to be used with older iPhones, but it's not a good idea because the charging with non-iPhone 12 devices is so slow. We did two tests with the iPhone XS Max, draining the...

MagSafe Charger Teardown Reveals Simple Design With Magnets and Charging Coil Encircling a Small Circuit Board

Friday October 23, 2020 7:50 am PDT by
iFixit has today shared a teardown of Apple's new MagSafe charger for the iPhone 12 and iPhone 12 Pro. An X-ray of the MagSafe charger courtesy of Creative Electron reveals the internal charging coil surrounded by a circular arrangement of magnets within the puck. The only seam that iFixit was able to leverage to open the device was where the white rubber circle meets the metal rim,...

Apple VP Kaiann Drance Interview Addresses Battery Life, MagSafe, and Power Adapter Concerns

Friday October 23, 2020 3:37 am PDT by
Apple's Vice President of iPhone Marketing, Kaiann Drance, has provided a new interview to Rich DeMuro on the Rich on Tech Podcast, to discuss the iPhone 12 and iPhone 12 Pro. Although much of the interview repeated points from Apple's "Hi, Speed" event, there were a number of interesting tidbits regarding the affect of 5G on battery life, MagSafe concerns, and the lack of a power adapter in...

iFixit Shares Full iPhone 12 and 12 Pro Teardown Revealing Interchangeable Displays and Batteries

Saturday October 24, 2020 1:48 pm PDT by
After live streaming a teardown of the iPhone 12 and iPhone 12 Pro earlier this week, iFixit today provided a more in-depth teardown that goes through all of the components in the new devices, revealing several similarities between the two. Early testing conducted by iFixit shows that the iPhone 12 and 12 Pro displays are interchangeable and can be swapped without issue, though the max...