If even two graphics cards in your PC are not enough, what about four? SLI typically is limited to two cards within one system, but sources told Tom’s Hardware Guide that Gigabyte will soon offer a “Quad” motherboard with slots for up to four Nvidia-based SLI cards.
About half a year ago, we learned that Gigabyte was working on a graphics card that integrates two GeForce 6600GT graphics chips. While we were impressed with the out-of-the-box approach from Gigabyte, there was of course the question, whether two of those cards could be combined for a total of four graphics chips.
Full Article @ TomsHardwareGuide