Samsung u28d590d with mid-2011 Radeon HD 6970M wont display

I have a new Samsung u28d590d monitor which is a 4k monitor. I fully understand my iMac cannot drive the full resloution, but I had hoped to use it as a matching 2560x1440 display for my iMac. However, using a mini-displayport to displayport cable, I'm not able to get the monitor to sync (display an image).
About the iMac:
Mid-2011
Radeon HD 6970M with 2048 MB
(Currently driving an old 24" Cinema display with no problems)
Processor 3.1 GHz Intel Core i5
Software OS X 10.9.4 (13E19)
The u28d590d works fine with my Macbook Pro Retina - drives it at 2560x1440 with no artifacts...looks fantastic!
What happens with the iMac:
The iMac recognizes the monitor - in Displays prefpane it thinks it's attached. I've tried mirroring and using it as a 2nd display. Both produce the same result: no picture at all. The monitor eventually goes to sleep.
Any thoughts? Shouldn't the iMac be able to drive an external monitor at 2560x1440?

Hi SpaceBass,
We just picked up exactly the same Samsung monitor (u28d590d) for use with a 2011 iMac 27" i7. Had done a bit of research regarding display port 1.2 etc, and was pretty much not holding any hope that it would work with this mac. But having read some reports that 4K support was being improved with OS 10.9.3 (which has just been superseded by 10.9.4), I was hoping there was a slim chance it would work... But sadly, no dice. I get exactly the same situation as you - the monitor control panel "sees" the monitor is connected, but it just stays black and never works no matter what settings try.
I knew however that even if the display port option was not going to work (to get 4K display @ 60Hz), then we could always just use the HDMI input on the monitor instead. This seems to work fine.. but.. I was expecting to get 4K res @30Hz this way, which I figured would be adequate. But it looks like the best I can get this monitor to display in this configuration is just full HD 1920x1080. Not sure why this is happening but that's the best I seem to be able to get out of it...
Does anyone have any idea of what I'm either missing here, or just what I'm not understanding? In any case, the monitor is still usable to us as is, and we'll be using it later with up-to-date MBP retinas as well, so at that point there will be no reason why it wouldn't deliver 4K @ 60Hz via display port. But I'd still love it if I could get the 2011 iMac to get 4K on this thing even if it's only at 30Hz...
TIA for any pointers,
Best,
Tbirdparis

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