J'ai trouvé ma réponse sur le site de nVidia :
How do I switch from using two or more monitors in 2D/single GPU mode to one monitor in SLI mode?
You can switch between these modes by enabling or disabling SLI technology in the 'NVIDIA Control Panel’ (right-click on your desktop to open). With Release 80 graphics drivers, this switch no longer requires a restart of your PC.
How many monitors are supported when running in SLI mode?
When in multi-GPU mode, SLI currently supports one monitor. When in single-GPU mode, users have the ability to use all of the connectors on their GPUs to connect to monitors using NVIDIA® nView® multi-display technology and Windows built-in multiple display support.
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Souriez!!! Demain sera pire -Murphy