Unlike AMD's hybrid graphics, Hybrid SLI will allow integrated and discrete graphics processors to combine their processing capabilities—perhaps the IGP could be used to compute physics, for instance. The technology appears to be intended for both notebooks and desktop systems. A purported excerpt from an Nvidia e-mail quoted by HKEPC states the following:
Depending on the processing demands of each application, the discrete GPU may be completely shut-down to save power. For the most powerful of systems, where the combined power of dual Geforce 8800 GTX SLI can reach 400W, both GPUs can be powered down when the user is just doing email, surfing the web, or watching a Blu-ray movie, keeping the system completely quiet and consuming the least possible energy.The excerpt concludes, "Hybrid SLI is our core PC ecosystem strategy for the coming year."
But when a game, or other demanding GPU application is launched, the dual 8800 GTX’s are powered up to deliver unrivaled performance.