15.04 How to check if Nvidia SLI is enabled w/ proprietary drivers?

Question

With the latest (tested) proprietary Nvidia drivers installed, how can you find out if Nvidia SLI is enabled? Can you check in the "Nvidia X Server Settings" application? Command-line?

(Running Ubuntu 15.04 x64 w/ two Nvidia Geforce 660's)

Answer 1

The SLI connector is a proprietary link between GPUs that transmits synchronization, display, and pixel data.

The SLI connector enables inter-GPU communication of up to 1 Gb/s, consuming no bandwidth over the PCI Express bus.

SLI is enabled by setting the SLI option in the X configuration file.

The nvidia-xconfig utility can be used to set the SLI option, rather than modifying the X configuration file by hand.

% nvidia-xconfig --sli=on

The valid values for SLI are Off, On, Auto, AFR, SFR, AA, and AFRofAA.

Check if SLI is enabled

The only way to check if SLI is enabled is checking first GPU and seeing what it says as the Screen0 it should say your screen model and then SLI.

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