MacPro 2013 will not show full display dimensions only 1080p

I own the "ASUS PB278Q 27-Inch WQHD LED-lit Professional Graphics Monitor" which has 2560x1440 WQHD resolution. When I use HDMI that works in full 1440 dimension quality, but when I switched to display port 1.2 using a wire from amazon "Accell B143B-003J UltraAV Mini DisplayPort to DisplayPort 1.2 Cable with Latch, White, 3.3-Feet" It only displays in 1080p max. Can anyone please help to explain why I can't acheive the full resolution of my displaying unless I use the HDMI wire? I switched to display port so I can plug in my TV to the HDMI port as a second display so I won't be able to go back to HDMI. Side note: No TV (second display) was not connected yet to affect any quality settings.
Thanks!

What is the refresh rate that the monitor is using? The FirePro 500's and 700's appear to have a problem displaying at 60Hz @ 4K. Theres a Samsung 4K thread here that describes how to alter one of the system files to get the refresh up, but the highest I've been able to get mine and have a stable full picture is 50Hz. We I believe are at Apples mercy waiting on an updated plist to fix this problem.

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