I'm leaving for Europe tonight but I want to make sure you aren't looking at the horrible default settings for the Dell monitor. At first you will be like "Oh God NO!" and then after you do this, you will be "YES!" First make sure to enable gsync for borderless window and full screen after you install the card and drivers. Then do the following:
Nvidia Control Panel > Adjust desktop color settings
Select "Use NVIDIA settings"
Brightness 50%
Contrast 50%
Gamma 0.72
Digital Vibrance 70%
Hue 0
Dell S2716DG menu
Brightness 43%
Contrast 75%
Set Custom Color:
R 97% G 99% B 96%
You will be blown away by the quality of the picture after doing this