4K Graphics Display with Mac Pro

Mac Pro Users,

I have been doing some experimenting with Mac Pro 5,1 and Nvidia Titan card, as per this thread:http://forums.macrumors.com/showthread.php?t=1605990

The reason for this was because I wanted to see if I could get Mac Pro to drive a 4K Ultra HD TV (LG 84LM9600 which has 3840 x 2160p resolution).

The LG only as HDMI 1.4a 4K input so my choice was limited to Graphics Adaptors that can provide 4K via single HDMI 1.4 port.

So far I have managed to get Titan going, but have not been able to get 4K resolution coming up as a choice.

Are there any users out there that have managed to get 4K display working with Mac Pro and if so could you please provide details of:

1. Graphics Adaptor
2. Connection type (DisplayPort or HDMI)
3. Display you are using

I am trying to find out if there are issues with 4K and current generation Mac Pro/OS X or if this is a software driver problem.

Thanks in advance,

Zebity
(Mac Pro 5,1 with Nvidia Titan, n x mini Mac, MacBook Pro with Retina Display)