3rd Party Display Resolution Issue - Mid 2011 iMac 27inch Mavericks- iMac wont allow max resolution of Samsung SyncMaster SA850

Hi Guys,
I just updated my 27 inch iMac to Mavericks and can't get my third party 27inch Samsung screen to run at maximum resolution. Even when using the "Alt" Click and select Scale shortcut I cant display the 2560 x 1440 resolution the screen is capable of.
I've called apple support and they couldn't rectify the issue nor could samsung. I've even tried the monitor in another iMac updated to mavericks and have the same issue.
Im connecting using a mini display port to DVI cable through my thunderbolt port.
My machine is Mid 2011 27inch iMac 3.1ghz core i5 with AMD Radeon HD graphics card upgraded to Mavericks
Monitor is brand new 27 Samsung SyncMaster SA850. I was able to get it to work at max resolution on a Windows 7 PC.
Any help would be appreciated. Thinking of returning the screen, hopefully Samsung will take it back.
- C

The standard > Mini DisplayPort to DVI Adapter only supports 24" monitor resolutions up to 1920 x 1200.
For a larger monitor you need either a > Mini DisplayPort to Dual-Link DVI Adapter
or perhaps a simple Mini DisplayPort to DisplayPort Cable if your monitor supports DisplayPort input.

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