Porn, why else? I found two useful for design work, but still found that I had windows overlapping and generally couldn't see everything I needed to at once. Another one would have done, but to run three monitors I needed two graphics cards, which gave four outputs, meaning one was unused and wasted. to be honest four is overkill for me and I found that the furthest left rarely gets used as it gives me a sore neck turning all the time To the person that asked how, the motherboard is an ASRock 4CoreDual-VSTA which supports both AGP and PCI-E graphics cards, of which I am using a 7900GTX (PCI-E) and 6200 (AGP).