My GTX 1070 Ti seems to run fine in areas of the game where there is farmland, and villages, etc. But when it comes to big cities such as Novigrad, Oxenfurt, in The Witcher 3, the GPU usage tanks all the way down to 50-70%. I monitor the CPU usage in TW3 as well and it never ever goes above 40%
Specs:
R5 1600 @3.8ghz
GTX 1070 Ti
MSI b350 Tomahawk
2x4gb HyperX fury ram OC @ 2666
Corsair CX550M PSU
Specs:
R5 1600 @3.8ghz
GTX 1070 Ti
MSI b350 Tomahawk
2x4gb HyperX fury ram OC @ 2666
Corsair CX550M PSU