The standard NVIDIA Control Panel shows you roughly 5% of what your GPU driver can actually do. NPI shows you the other 95%. It allows you to modify driver profiles for individual games (.exe files), global defaults, and even access experimental features never officially supported.
Before changing anything, take a screenshot or click "Export Current Profile" (the save icon). nvidia profile inspector
If you change 20 settings and the game crashes, you won't know which one broke it. The standard NVIDIA Control Panel shows you roughly