Nvidia Titan RTX - Enabling; Disabling SLI

Configuring SLI (NVLink)
NVIDIA TITAN RTX User Guide | 15
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Enabling / Disabling SLI
1 Once you have the NVIDIA Control Panel open, click on Configure SLI,
Surround, PhysX in the left task pane.
2 Enable SLI by making sure the Disable SLI button is not checked.