VR SLI
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VR SLI is a VR rendering technology part of the Nvidia's GameWorks VR.
VR SLI increases the performance of VR Apps by assigning 1 or more GPUs to each eye when doing stereo rendering (creating a different image for each eye).
Because VR utilizes 2 independent views, developers can parallax the rendering across 2 different GPUs then combine the images into a single frame in the HMD. It allows the app to have higher fps or graphical settings. Additionally, VR SLI API allows developers to scale the entire system to more than 2 GPUs. Developers can split up the rendering anyway they want across any number of GPUs they desire.[1]