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A lot of people have no idea what SLI is, or what it does. SLI (Scalable Link Interface) allows your computer to use two video cards at once and it improves your video performance. To use SLI you need to have a PCI Express motherboard that supports SLI, currently only the NVIDIA nForce 4 chipset supports it. The board must have two 16x PCI-E slots, and you must have 2 identical video cards that support SLI, like the GeForce 6 series GPUs.
SLI scales the video performance between the two video cards, so that each card draws half the picture. There are three different ways the pictures can be split up; each card can do the top or bottom, the left or right, or even and odd pixels. The video cards will automatically determine which mode to use depending on the game. SLI will work withL or Direct3D.
SLI gives you a better performance gain when there is a strain on the video card, that means at the higher resolutions. At 1024x768 there is not much of a gain, as you go on to the higher resolutions you get a better improvement on SLI. SLI is also not supported by all games.
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