So this is it, I've been tweaking some options but you can improve yourself if you want to. It's pretty good IMO, as I can play very demanding games with great graphics quality and still very high FPS. I'll write it down as my settings are in portuguese so a print screen would be confusing.
Anti-Aliasing FXAA - OFF
Anti-Aliasing Settings - Cannot select this one
Anti-Aliasing Gamma - OFF
Anti-Aliasing Mode - Application-Controlled
Anti-Aliasing Transparency - OFF
Triple Buffering - OFF
CUDA - All
Cache Shader - On
DSR - OFF
Anisotropic Filtering - 16x
Texture Filtering - Negative LOD - Clamp
Texture Filtering - Anisotropic Sample Optimization - OFF
Texture Filtering - Quality - OFF
Texture Filtering - Trillinear optimization - High performance (this one and the above can be anything you like better, doesn't make too much difference in performance)
Power Management - Adaptative
MFAA - OFF (because it does disable DX12 for some reason in dxdiag, besides that it could be On)
Max. Pre-rendered - 1
Ambient Occlusion - OFF
Threaded optimization - Auto
Pre-rended frames VR - 1
Vertical Sync - OFF (if you want/need it, put as application-controlled and enable triple buffering, it will cap your FPS to your monitor frequency [60hz-75hz-120...])
Preferred refresh rate - application-controlled
Multi display/mixed gpu - Single display performance
It should be something like that in english. Another recommendation is to make a clean install in all drivers, including the motherboard ones, the intel ones (management interface,..)... Also, if you've updated your windows to 10 and didn't do a clean install after, I truly recommend you to format your HD, as the update made lots of PCs with such problems.