To verify that NVIDIA SLI technology is enabled and working
From the NVIDIA Control Panel navigation tree pane, under 3D Settings, select Set SLI configuration.
From the menu bar, click 3D Settings, then click the drop-down menu item Show SLI Visual Indicator.
The following images indicate that SLI technology is active.
A vertical green bar with the text "SLI" appears on the left side of the game screen if SLI AFR rendering is enabled and working.
The antialiasing level with the text "SLI" appears on the game screen if SLI antialiasing is enabled and working.
A green square appears on the primary - or focus - display when the game is viewed in full-screen mode.
If no image appears, then the system is not in SLI mode.