Scalable Link Interface (SLI) is a brand name for a multi-GPU solution developed by NVIDIA for linking two (or more) video cards together to produce a single output. SLI is an application of parallel processing for computer graphics, meant to increase the processing power available for graphics. With SLI, it is possible to theoretically double the power of your graphics solution just by adding a second video card with an identical GPU. The basic idea of SLI is to allow two (or more) graphics processing units (or GPUs) to share the work load when rendering a 3D scene. Ideally, two identical graphics cards are installed in a motherboard that contains two PCI-Express x16 slots, set up in a master-slave configuration. Both cards are given the same part of the game (scene) to render, but effectively half of the work load is sent to the slave card through a connector dubbed the SLI Bridge. For example, in some cases the slave card will work on the bottom half of the screen. The slave then sends its rendered output to the master card, where it is incorporated into the master card's own image (in the frame buffer) and sent to the screen.