Iâ€™m in china at the moment canâ€™t watch u tube! But if the spec sheet on Nvidia web site says only supported for tri sli, do you really think you are going to get good driver support for games with quad sli?
Here is another 4-way SLI scaling review:
Obviously, it varies from game to game. But 2 things for sure: you need a very beefy CPU and high resolution (3-monitor setup, like this: http://www.overclock.net/water-cooli...tx580-sub.html) in order to show the true colours of the 4 cards.