To be able to understand what we are doing today, we need to briefly take you through some of the key components used for our PC. Today we use a home built DIY (Do It Yourself) X58 based Core i7 system. So you see, there are many methods where two or more GPUs can be utilized to bring you a substantial gain in performance. Alternate Frame Rendering, each card will render a frame (even/uneven) or Split Frame Rendering, simply one GPU renders the upper or the lower part of the frame. There are multiple ways to manage two cards rendering one frame think of Super Tiling, it's a popular form of rendering. Multi GPU rendering - the idea is not new at all. Screenshot of three cards with SLI enabled on the NVIDIA control panel. Then install/update the drivers, after which most games can take advantage of the extra horsepower we just added into the system. ![]() Once we seat the similar graphics cards on the carefully selected motherboard we just bridge them together, with a supplied Crossfire connector or, in NVIDIA's case, an SLI connector. A small note, if you are on an AMD processor then on AMD's side the 900 series chipset supports SLI as well. If your motherboard does not have the SLI certification mentioned on the box, it's likely not SLI compatible. An SLI certified motherboard is an nForce motherboard with more than two PCIe x16 slots or a certified P55, P67, Z68, X58 or a Z77 motherboard.A Crossfire compatible motherboard is pretty much ANY motherboard with multiple PCIe x16 slots that is not an nForce motherboard. ![]() You could for example place two or more ATI graphics cards into a Crossfire compatible motherboard, or two or more NVIDIA GeForce graphics cards in SLI mode on a compatible motherboard. The more GPUs, the worse the scaling becomes though, two GPUs in most scenarios, is ideal. This way you effectively try to double, triple or even quadruple your raw rendering gaming performance (in theory). Both NVIDIA's SLI and AMD's ATI Crossfire allow you to combine/add a second or even third similar generation graphics card (or add in more GPUs) to the one you already have in your PC.
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