Por que no entras por el panel de nvidia y creas la resolución. Seguramente estará como desactivado. O en las propiedades del monitor.
En las especificaciones pone esto Two dual-link DVI outputs for digital flat panel display resolutions up to 2560×1600
• Dual integrated 400 MHz RAMDACs for analog display resolutions up to and
including 2048×1536 at 85 Hz
• HDMI 1.4a support including GPU accelerated Blu-ray 3D support, x.v.Color, HDMI
Deep Color, and 7.1 digital surround sound. (Blu-ray 3D playback requires
compatible software player. See
www.nvidia.com/3dtv for more details).
• Displayport 1.1a support
• HDCP support up to 2560×1600 resolution on all digital outputs
• 10-bit internal display processing, including hardware support for 10-bit scanout
• Underscan/overscan compensation and hardware scaling
Esa gráfica por especificaciones puede sacar esa resolución