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How many video outputs does SLI technology support?
The GeForce Release 180 driver (and newer) enabled NVIDIA SLI Multi-Monitor support, giving you the ability to use two monitors with your GeForce graphics cards in SLI mode. Now you can easily switch between multi-monitor desktop mode and full screen 3D gaming mode without any additional system settings. Please see the following link for display modes and configuration options.
http://www.geforce.com/hardware/technology/sli