ECS Photon Extreme KN3 SLI2 Manual page 64

5. From the Display Properties dialog
box, select the Settings tab then
click Advanced.
6. Select the NVIDIA GeForce tab.
7. Click on the slider to display the
following screen, then select the
SLI multi-GPU item.
Slider
8. Click the Enable SLI multi-GPU check box.
9. Click OK when done.
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