Second IPS display via hdmi not displaying 2560x1440. Why?

I know the graphic card hardware in my 2013 i7 mac mini support hi-res hdmi because people are running Windows 7 on their mini's with dual 2560x1440 ips displays. I read that this would be resolved in Mavericks but I can't seem to get above the 1080p resolution. What am I missing? Do I need to reset something? Was I better off sticking with my old 2009 mac mini with the mini display and thunderbolt port?
Thanks
Andre

I've received several different answer regarding your reply. The monitor tech support person stated that the hdmi port on the display is 1.3b which will support that resolution. So either both of the hdmi cable that I tried sucked or the support person lied and or OSX is limiting the hdmi port.
I guess I'll just purchase a Startech USB32DPPRO adapter since I can't get the answer I want.
I hate that Apple took away the second mini/thunderbolt port.
Thanks for your assistance.

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