Does the new Macbook Pro 15" (late 2013) supports 4K via Thunderbolt/Displayport?

I have that model - that Late 2013 rMBP 15" with only Iris Pro graphics, and I have it attached to an LG 34UM95-P running at 60Hz.

As far as I know, I'm using SST - I have not done anything special to enable/use MST. I just bought the monitor and plugged it in using a mini-DP to DP cable.

Let me know if you need more details. Thanks.

Actually, yes, but it does change something !!

It must run into a "total pixels pushed" limit, because when I open the laptop and use that display, I get this in the System Report:

Then if I close the lid again, it goes back to what I posted before. So I'm a little bit confused over why it switched the 4K monitor to 1080p....

I don't think I'm using scaling in that way. I use SwitchResX and I have run the monitor at 3840x2160 HiDPI and 2560x1440 HiDPI and the performance seems to me to be fairly equal in each.

I do not use bootcamp.

My thoughts on your dilemma with discrete GPU or not is that I wish I had chosen the discrete GPU instead of the model with the "Iris Pro only" graphics. At the time I decided to purchase, I was intending to only drive ONE external monitor at 1920x1200, and had no idea that within a year, I would be driving BOTH a 3840x2160 monitor AND ALSO a 3440x1440 monitor. Had I know, I would have DEFINITELY got the model with the GT 750M. The idea there being "it's better to HAVE discrete GPUs and not need them, than to NEED them without having them!!!"

If I had it to do over, I would definitely gone with the higher video horsepower.

I don't have your answer, but you are discussing orthogonal issues. The 10x improvement in graphics is how fast the computer can draw to the screen buffer. The 4K 60Hz issue is how fast the port protocol allows the finished screen to be transferred to the device. The main hope of the 10x is that IF your computer can support a 4K display, then it will also be usable at that resolution - for example, you won't see lagging window drags, window scrolls, etc.

As an example, all our 2010 Macs support 2,560 displays, but the GPUs aren't really up to it. Only in the best circumstances can we, say, watch a video at that resolution, and I often have to drop it down to 1,280 x 800 depending on what I'm doing.

@FaisalZ How did you get it to output 4k @ 6Hz?

I have the Dell P2715Q connected from the mDP on my late 2013 rMBP to full DP port on the monitor with cable supplied with the monitor and it only outputs 30Hz to a single screen in Mac OS X El Capitan.

And even with SwitchResX, the best resolution that appears to be supported is 3840 x 2160, 30Hz.

The HiDPI scaling works great, though, but the refresh rate is so horrible, I'm finding myself wanting to use the main laptop screen!

Also worth noting, the second monitor downstream won't display at all, but when I connect a Lenovo laptop running Windows 10 it works fine. The main display is still only running at 30Hz, though, even in Windows.

why would you need an external GPU when you already have a, let's say Iris Pro, that is perfectly capable of doing 4K@60Hz via Thunderbolt?

Well, the hardware supports it, so as long as you can find drivers Windows 7 should work fine too. With proper drivers, the edition of Windows 7, 8, or 8.1 doesn't matter - all should work.

unfortunately 10.9.1 didn't bring any changes, no Displayport MST.

10.9.2 mentions "graphics drivers", so maybe it brings 4k 60Hz?

This is a good question.... These folks would know the best: forum.netkas.org

Try posting there.

there seems to be a new released driver for mac pros from nvidia:

http://www.nvidia.com/download/driverResults.aspx/73628/

unfortunately not for macbooks?

also no infos on MST Support yet...

To me this looks like its working as MST. Surprising he doesnt give more info, because normally MST must be selected on the display manually.

I'm running Yosemite Public Beta 3, which outputs 4K @ 60 Hz. In fact, I think all the public betas have output at 60 Hz.

Yes it has the GT 750M 2Gb card inside. So you connected via a mDP-mDP cable instead of a mDP-DP cable. I find it hard to believe that would make a difference, but maybe I'll try that.

Just to confirm korgir the Macbook Pro Retina Display late 2013 works for you with the Thunderbolt 2 port @ 4K 60hz under Windows 8.1 with the ASUS PQ321Q? If so that's great news. We should see a driver update for Mac OSX Mavericks soon likely coinciding with the release of the Mac Pro.

Good point. It would definitely be in the Apple's best interest to add driver support for 4K60hz, as it would be another great selling point of the Macbook Pro Retina. It's one of the main reasons why I'm holding.