3-way NVIDIA SLI is enabled from the NVIDIA Control Panel. Right mouse
click on the Windows desktop and select NVIDIA Control Panel. Go to 3D
Settings¼Set SLI configuration (Figure 19) and select Enable SLI technology
(recommended). After selecting this option, you will be prompted to verify the
settings have been successfully configured.
Note: Selecting Do not use SLI Technology sets the configuration into single GPU
mode.