Custom Resolution Utility (CRU)

[Bioshock]

Hey Toasty. Just registered here because I have a question I'm hoping you can answer for me about the CRU.

I have a 4k TV hooked up to my GTX 780 via HDMI, and I'm looking to make a custom resolution of 3840x1600 for ultrawide gameplay.

I am using CRU 1.3, and I have tried LCD-Standard, LCD- Native and Manual as well without changing any options, and this resolution just does not show up at all when I go to select the resolution in Windows, Nvidia CP, or any games. (I do not want this as my native resolution, only for gaming.) My native resolution is 3840x2160 @ 60hz, which is the top resolution in CRU. 3840x1600 is 2nd on the list, and theres one other on there with 1920x1080 @ 60hz.

Is there a reason why my custom resolution of 3840x1600 doesn't show up anywhere after setting it in CRU and using restart.exe? What am I doing wrong? After using restart.exe, everything seems fine like the screen actually took it, and can use this resolution, just not able to see or use it anywhere.

Hope to hear back soon.

EDIT: I should also mention I have scaling off, and "Enable resolutions not supported by this display" is enabled in NVCP if that makes any difference.