Asus Z170-WS Manual page 187

B2. From the Screen Resolution window,
click Advanced settings.
B3. The NVIDIA Control Panel window
appears.
Enabling SLI settings
From the NVIDIA Control Panel window,
select Configure SLI, Surround, PhysX.
In the Quad-SLI enabled, click Maximize
3D Performance SLI to set the display for
viewing SLI rendered content. When done,
click Apply.
ASUS Z170-WS 6-11