Mac Pro 2012, GTX 770, OSX 10.8.5 and 4K monitor

Question

Hi everyone,
I am not sure, so it's better to ask.
I have the previous model of Mac Pro (12 core 3.33GHz) with GTX 770 plugged in. The system is 10.8.5. Till now, I was using Apple Cinema Display HD 30", but I would like to change it to a better monitor with 4K resolution if it will be possible. The question is, will it work fine with this card and under this version of OS?
I don't want to upgrade the OS, because well… I don't like how it looks like, so this version of OS is quite important for me.
The graphic card itself can run this resolution without a problem, but what a bout the OSX? Everything will be OK?

Answer 1

MarekO I do recall your name from before, just not the particulars.
Apple never updates specs on maximum memory, hard drive compatibility and other things. Even the fact that the ATI 5770 worked in any and all Mac Pro models outside of audio support, which was a godsend to many like me with a 2006 1,1.
Someone wrote that one GPU required 800MHz DDR2 (mine came with 667MHz) so people wanted to just swap the memory figuring that was what the graphic card needed. Nothing to do with memory speed. Everything to do with EFI 32 vs 64 (and no mention of UEFI or the more accurate and technical).
Okay
Did you read where the ASUS monitor customer had trouble? and that a firmware upgrade helped? Notice also the horrid customer support they first received and how miniDisplayPort vs DisplayPort?
I am sorry I don't have more experience or own a 4k monitor Would like to, sure.
There have been - especially a year ago - there was a lot of "hand-wringing" over which brand and models of 4k would even work on a 6,1 - let alone work with GTX 770 (which is supported on your Mac when running Windows btw in 4k mode, so there!)
Here is help and to wet your appetite:
Anyhow, can't help but be reminded today when I discovered how to enable 60Hz 4K MST on Nvidia cards. Seems Apple didn't want the cMP rubbing elbows with nMP so took to some more deliberate knee-capping. (how Kerrigan-esque !)
I put the Asus PQ321 in MST mode and Nvidia GPU can output 3840x2160. And if I run the "OpenClOcenawaves" bench, I get 61fps. Anyone familiar with this app knows it has been locked to refresh rate for last 2 OS builds. You can unhook it with Quartz Debug, but for my purposes, better not.
scottrichardson /showthread.php?p=19427891#post19427891
/showthread.php?p=19427891#post19427891
Exciting stuff!! Though to be honest I had no idea we couldn't already plug a 4K display into our cMP's and get 60Hz support. I thought that was what they fixed in 10.9.3?
Only on AMD cards, been there since 10.9.2 I think. They stacked the deck against Nvidia, they have been limited to 30Hz. Artificially as it turns out.
SST displays are a different story.
Suddenly it's 1984 - Nvidia 4K 60 Hz support is there, Apple turned it off ( 1 2 3 4)
MacVidCards
So AMD vs NVidia stuff. And can't cannibalize AMD on cMP without also damaging Dxxx so the R9 280x and above are a safer bet. 
People have been (trying) to tell me that the CUDA vs OpenCL is "history" and not as big an issue (though AMD drivers and Adobe apps on nMP 6,1 and those Dxxx's are (or have been) a real issue for the last year. It can take 12-18 months for changes, to make their way into the market and next Adobe upgrade. So they have had their year!