CPU: Core i7 3770K @ 4.2GHz
GPU/Monitor: nVidia Geforce 1080 Ti / Dell 2716DG G-Sync Monitor
RAM: 24GB of RAM
Storage: Samsung 860 2TB SSD (and multiple other HDDs).
OS: Windows 7 x64
-I solved my severe stutter-issue by disabling G-Sync for Sandstorm and choosing fixed refresh rate (120Hz) from my nVidia control panel. Also, enabling V-Sync from the game menu.
-It seems that currently there are issues with Sandstorm and G-Sync. The difference in game smoothness and frame times is huge (for the better) when disabling it.
-Although counterintuitive, in my case it helped a lot.