Resolution for U2715H maxed out at 2048 x1152

I have an Nvidia card GeForce GT 520 (http://www.geforce.com/hardware/desktop-gpus/geforce-gt-520/specifications) which is supposed to support up to 2560x1600.
I'm connecting to my U2715H monitor using an HDMI 2.0 cable (the packaging says it supports UltraHD/4K). My OS is Windows 8.1.
The OSD says Maximum is 2560 x 1440 @60Hz, however in the Windows Control Panel, the highest resolution listed is 2048 x1152.
Any ideas how to fix this?

Thanks Chris. two follow-up questions:
1- Does the cable need to be HDMI 1.4? I thought HDMI 2.0 is backwards compatible
2- When you say the driver, you mean the video driver? (I downloaded the monitor driver from here: www.dell.com/.../DriversDetails)

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Resolution for U2715H maxed out at 2048 x1152

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