Anyone with SLI problems has a solution. (The Witcher 3: Wild Hunt)

In general, it's not a secret for anyone that The Witcher 3 has a problem with the SLI GPU on Win 10. Due to the broken profile.
The problem is that with two video cards the load of a maximum of 50% on the video card from here the FPS can be less than when working with one video card figuratively. The load on video cards in SLI is 50-50% in one VK 99%.
In order for both video cards to work at full capacity in The Witcher 3, you need to install the nvidia inspector program
in this program, open the Witcher 3 profile and set the value 0x280000f5 against DX1x, if you don’t want to write, then open the available profiles in the same column and find in at the very bottom 0x280000f5 (Lord of the Rings Online: Shadow of Angmar, Lost planet 2, Pollen demo) .. Save the whole thing. We leave the program and play at full strength in The Witcher.
The only moment you will have to refuse from Hairworks, since it uses its own profile and, accordingly, you will also have a load of 50% and bottom fps.