Macbook pro retina 15" to Dell 4K monitor

Hi
I am thinking of buying a Macbook Pro 15" retina (top of the range with Nvidia 750) and a Dell 4K monitor (UP2414Q or UP3214Q). Can anyone confirm - preferably by having done it themselves! - that (1) either of these monitors can be connected, at least via HDMI at 30Hz, and (2) it supports mirroring (i.e. I want to use the laptop in clamshell mode with the Dell display as the sole monitor)
I realise there is a lot of discussion about how to connect 4K monitors via Thunderbolt at 60Hz, but the faster refresh is not very important for me. I just want to know I HDMI at 30Hz works for either of the Dell 4Ks.
Finally, given that I only want to connect a single 4K monitor and 30Hz refresh is OK for me, can you tell me if there is any advantage to spending 2K more and getting a Mac Pro?
Cheers, Mike

Short answer: I have this exact configuration, and yes, the newest rMBP 15" w/Nvidia card will drive the UP3214Q over HDMI at 4k and 30Hz. It will drive it as a separate desktop with the laptop open, and it will drive it as the sole display -- either way works fine.
Longer answer: You should be aware of 2 things (that I wish I had been more aware of before purchasing the monitor)
1) If you are used to 60Hz or higher, the 30Hz limitation over HDMI is noticable, even in day-to-day productivity work. The mouse lag is very noticable and annoying to me.
2) Scaling/HiDPI support [the way the integrated retina display works] is virtually nonexistant at the resolution you'd want to run it at. What this means is that you either run the monitor at a lower resolution (and everything is blurry), or you run it at full resolution and everything (menu, dock, fonts, etc) is extremely small. You can use SwitchResX to enable scaling support at odd resolutions (for instance, I've successfully gotten HiDPI/scaling to run at 1920x1200 and 2048x1080, with black bars at the edges), but it's not an ideal resolution for this size monitor. I want to match the TB display resolution (2560x1440) in HiDPI mode, but I've been unable to get it working after hacking away at it for 2 days.
I'm hoping that Apple will fix these limitations. Multiple people have reported that MST over DP1.2 works on the same hardware if you boot into Windows, so the hardware support is there -- it just needs to be enabled in the drivers by Apple. Whether they actually will or not is anyone's guess. In the meantime I (and many others) are in limbo wondering if we should return these 4k displays, or keep them and hope "proper" support comes. Since it's not a specifically advertised capability, Apple isn't under any obligation, but I think there's more than a few people hoping that Apple does right by the users and enables the full functionality that the hardware supports.

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Open System Preferences > Network then select the Wi-Fi tab.
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Google Translate says you are speaking Italian and in English you are asking: / Google Translate dice che si parla italiano e in inglese si sta chiedendo:
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Of which I say / Di cui io dico:
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Non deve trattarsi di alcun ritardo a tutti su un MacBook Pro Retina. Quindi vi suggerisco di contattare Apple. Ecco le loro informazioni:
Italy
Start your support request online and we'll connect you to an expert.
(39) 199 120 800*
www.apple.com/it/support/

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