Amnesia runs slow even with great PC spec's

[plutomaniac]

With such a graphics card it should be at constant 60 fps at maximum settings. You said it worked fine before getting the new graphics card so it's either corrupted drivers, corrupted game files or wrong configuration file.

1) Did you follow the guide to remove the AMD leftovers completely? Reinstalling just the nvidia driver is not enough.
2) After that, go to Documents and rename the folder Amnesia to Amnesia_TEST.
3) Do a steam file integrity check.
4) Start a new game after setting all the graphics to the highest level and see if it still lags.