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I'm a little confused because I thought thunderbolt/2 was supposed to have amazing throughput. Why can't you use just one cable? Where exactly is the bottleneck(s)?
 
4K monitor -> counterpart to a 24' monitor with 1920 * 1080 pixels -> now 3840 * 2160 pixels

5K monitor -> counterpart to a 27' monitor with 2560 * 1440 pixels -> now 5120 * 2880 pixels

While the term is imprecise, I much prefer "K" horizontal resolution (4K, 5K, 8K) to "P" vertical resolution (480p, 720p, 1080p).

Many video contents, particularly movies, come in different aspect ratio, with differing vertical resolution. But they all fit into 640 (480p), 720 (480p), 1280 (720p), 1920 (1080p), 3840 (4K), 4096 (4K), and 7680 (8K) resolutions.
 
2014 MacBook Pro GT750M?

Has anyone tested the UP2715K with a 2014 MacBook Pro with GT750M? One of Dell's support pages explicitly states (more than once) that this machine supports "5k3k" (which I presume means 5120x2880 native, or 2560x1440@2x).

http://www.dell.com/support/article/us/en/04/SLN295089/EN

See the "Configuring your system and the UP2715K to display 5k3k @ 60Hz resolution" and the "Abnormal behavior on some Apple Mac platforms" sections.

EDIT: I'm also interested to know if this display would work with one of the two mini DisplayPort cables running through, say, an OWC Thunderbolt 2 dock, so that other peripherals could use the dock rather then having to run everything through USB 3.0 ports on the laptop/display, as both Thunderbolt ports on the laptop would be used up.
 
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The race for "thinner" and "higher resolution" is killing Apple's computers IMO. The point will be here soon where I have this thin piece of crap that can drive a 5k display with, but can't do much else due to the crippling of hardware/software and the lack of any usefulness.

I've said this before, and I'll say it again. When I get a new iPhone, the first thing I did was put all Apple's apps in one folder and put them on page two. I then went and downloaded third party apps that were better and did what those Apple apps should have done.

Now, when I install Yosemite, I do the same thing. I don't use any Apple apps any longer, except really Aperture. Yosemite has to be the worse OS X version I've ever used. All I do all day it seems is force quit apps, and that's after a clean install.

I use two Mac's daily, and in my entire ownership since 2006 from 10.4 through 10.10, I've forced quit 3 times.

Maybe you should investigate what processes you are doing to figure out why the app is crashing. A clean install is not always the answer, especially if the data you are feeding the app is damaged or corrupted.
 
How is this the first laptop to support 4k? The 2015 13inch rMBP has the following advertised:

"Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 3840 by 2160 pixels on up to two external displays, both at millions of colors."

To me this means i could connect any two 4k screens via displayport and be a happy camper!?
 
The race for "thinner" and "higher resolution" is killing Apple's computers IMO. The point will be here soon where I have this thin piece of crap that can drive a 5k display with, but can't do much else due to the crippling of hardware/software and the lack of any usefulness.

I've said this before, and I'll say it again. When I get a new iPhone, the first thing I did was put all Apple's apps in one folder and put them on page two. I then went and downloaded third party apps that were better and did what those Apple apps should have done.

Now, when I install Yosemite, I do the same thing. I don't use any Apple apps any longer, except really Aperture. Yosemite has to be the worse OS X version I've ever used. All I do all day it seems is force quit apps, and that's after a clean install.

Apple's strength is their software and hardware combo ecosystem. If you're dismissing all of their software you might as well not buy an Apple product because you are paying extra for the stuff you don't seem to like. You're also buying the thinnest and lightest hardware that include Yosemite which you also hate.

So what do you like and why do you buy any thing from Apple?
 
Do they? I might have to retract my statement then. I never thought AIO machines could be used as standalone monitors.

Yes, it's been supported since 2009 on the 27", and 2011 for the 21.5". The 27" 5K is the first to not support it since then, although the next generation 5K will probably bring support back.
 
I'm a little confused because I thought thunderbolt/2 was supposed to have amazing throughput. Why can't you use just one cable? Where exactly is the bottleneck(s)?

As much bandwidth as it has, it doesn't have enough for 5K.

How is this the first laptop to support 4k? The 2015 13inch rMBP has the following advertised:

"Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 3840 by 2160 pixels on up to two external displays, both at millions of colors."

To me this means i could connect any two 4k screens via displayport and be a happy camper!?

This is a 5K monitor, not 4K.
 
The race for "thinner" and "higher resolution" is killing Apple's computers IMO. The point will be here soon where I have this thin piece of crap that can drive a 5k display with, but can't do much else due to the crippling of hardware/software and the lack of any usefulness.

I've said this before, and I'll say it again. When I get a new iPhone, the first thing I did was put all Apple's apps in one folder and put them on page two. I then went and downloaded third party apps that were better and did what those Apple apps should have done.

Now, when I install Yosemite, I do the same thing. I don't use any Apple apps any longer, except really Aperture. Yosemite has to be the worse OS X version I've ever used. All I do all day it seems is force quit apps, and that's after a clean install.

If you don't like it, go back to thick and low-resolution PCs then. I certainly wouldn't want to, not after having actually used a 5K display.

Also, I rarely have to Force Quit apps, that doesn't seem normal at all.

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I'm a little confused because I thought thunderbolt/2 was supposed to have amazing throughput. Why can't you use just one cable? Where exactly is the bottleneck(s)?

Not enough bandwidth for 5K @ 60 Hz in a single stream. Driving a 5K display is more demanding than you'd think, but consider that it has almost twice as many pixels as a 4K.
 
Can anyone with a late 2013 15" rMBP with 750M and a 4k monitor confirm that they can do SST over displayport 1.2 and get 4k @ 60hz?
 
The race for "thinner" and "higher resolution" is killing Apple's computers IMO. The point will be here soon where I have this thin piece of crap that can drive a 5k display with, but can't do much else due to the crippling of hardware/software and the lack of any usefulness.

I've said this before, and I'll say it again. When I get a new iPhone, the first thing I did was put all Apple's apps in one folder and put them on page two. I then went and downloaded third party apps that were better and did what those Apple apps should have done.

Now, when I install Yosemite, I do the same thing. I don't use any Apple apps any longer, except really Aperture. Yosemite has to be the worse OS X version I've ever used. All I do all day it seems is force quit apps, and that's after a clean install.

I disagree.

1. Any machine that can drive a 5k display is not a dog. They said the same thing about the rMBPs when they first came out. And, while I wouldn't have bought the first-gen 13" rMBP (I have the current one), they are by no means under powered.

2. Using a high DPI display is probably the single best thing you can do to improve the UX in my opinion. Going retina on my phone and laptop was ... probably the best part about upgrading. I'm waiting for prices to come down and compatibility to improve, but I can't wait to upgrade my monitors to 4k.

3. You're free to go back to SL if you think it's better.

4. While I'm not in love with Yosemite, and it's certainly not my favorite OS, I don't have near the problems you seem to be having. I have had no wifi problems and rarely have to force quit anything.
 
Maybe because you can use the Dell for 15 years, while the iMac will be out of date 2 years from now.

15 years? Tell me, how many people do you still see using LCD and CRT displays from 15 years ago with modern Macs today?

It will become outdated when OLED and 8K come along, you can be sure of that.
 
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Any machine that can drive a 5k display is not a dog.

It's possible to have a computer where you can browse and edit text in 5K beautifully, but more complicated applications become terribly slow, due to the resolution they need to render. It's not just games, but things like Lightroom and VMware, too. There's no faster way to slow down your otherwise speedy computer than by connecting a 5K display to it.

On my MBP I used to be able to run 3 VMs in 1280p, but ever since I got a 4K monitor, I need to watch how many apps I have open, and everything feels a bit sluggish. The Mac applications don't have a problem, but Windows 8.1 in VMware does, even after considerably increasing the RAM and VRAM allocated to the VM. And that's just 4K. Now I feel sorry for not buying the dedicated video card option. And integrated video was perfectly fine in HD.
 
As much bandwidth as it has, it doesn't have enough for 5K.

Not enough bandwidth for 5K @ 60 Hz in a single stream. Driving a 5K display is more demanding than you'd think, but consider that it has almost twice as many pixels as a 4K.

Why hasn't Apple made a 4K display then? Their current Macs seem to be able to support it. Is there some other technical/practical/financial reason against? Is it not high enough resolution to be considered Retina and therefore not worth the trouble?
 
Why hasn't Apple made a 4K display then? Their current Macs seem to be able to support it. Is there some other technical/practical/financial reason against? Is it not high enough resolution to be considered Retina and therefore not worth the trouble?

I'd lean toward the second one. To replace a 27" 2560x1440 display with one that is truly Retina, it would have to have 4x the pixels (5120x2880) which is 5K.
 
15 years? Tell me, how many people do you still see using LCD and CRT displays from 15 years ago with modern Macs today?

I have a 10-year-old 24" Dell UltraSharp. Yeah the CFL backlight is outdated, but the LCD is the same IPS technology as today. I've since upgraded to 4K and 5K, but I was really using the monitor for a decade. And 4K is so good already, they won't be completely outdated for a long time.

I couldn't have imagined that I would be using this Dell for so long, but that's how it turned out. We jumped from 1280p to 4K overnight. It was not a gradual, incremental progress. One day everyone was using HD, and then overnight it became 4K. In 2004 I had no idea that a decade later HD would still be prevalent. Couldn't have guessed it.

And guess how many people still use HD. 95% of the people are still using HD monitors. I don't know anyone who has 4K, let alone 5K. Even 4 years from now a lot of people will be stuck with HD, I can guarantee you that. And many of us use more than one computer, I use 8, so those old HD monitor will be running for a long time.
 
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I can barely see some of the UI elements on my 27" 4K monitor. A 5K monitor at 27" will look great for presentations, but for doing actual work I'm not sure I would set it at the highest resolution.
 
Why hasn't Apple made a 4K display then? Their current Macs seem to be able to support it. Is there some other technical/practical/financial reason against? Is it not high enough resolution to be considered Retina and therefore not worth the trouble?

My guess is:

1) They are waiting for Skylake, which will have native support for DP 1.3.

2) More robust GPU capability from AMD/NVIDIA, which is why you've only seen support on the Mac Pro and 5K iMac (and the latter features a custom controller chip from Apple to make it work).

3) Unlike TVs, 4K (UHD) monitors haven't really taken off yet. They're out there, but they're still relatively expensive as opposed to the ubiquitous 1080p monitors or the increasingly-popular 1440p monitors one can find.

4) There's still relatively little content for 4K, which will start to change this fall. In terms of offering a standalone 4k display, I'm sure Apple is content to sit on the sidelines while the content market catches up to the hardware market.
 
I can barely see some of the UI elements on my 27" 4K monitor. A 5K monitor at 27" will look great for presentations, but for doing actual work I'm not sure I would set it at the highest resolution.

You can increase the font size, and scale the UI elements up. Windows has very bad high dpi support right now, but it'll change I'm sure. Macs are almost flawless in this regard. On my retina iMac I sometimes have to zoom in on some of the websites. But the text is amazing. Unfortunately a lot of the websites use low resolution images (including MacRumors, here and there). So on a 5K display it's currently an annoying mixture of very blurry images and very sharp ones.
 
I've been running Yosemite since Day 1. I have no idea what you are talking about.

Same here. And I'm running Yosemite on a 2007 iMac. The only thing I can think of, is that he's used to Windows, which, when you click on the "X" button on the top corner of the window, shuts down the whole app. Whereas OSX has always only closed the window for that app, but left the app open. To shut down the app, you have to either click on "File", "Quit" or the keyboard shortcut CMD/Q.
 
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