The gtx 580 has 2 dvi and 1 hdmi i know that if i do not have it in sli i cannot game on three monitors this is ok. With the work i do with excel and so fourth i would love to span it across 3 monitors is this posible for a single gtx 580 once again i will not be gaming on it.
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A single Nvidia card can output to a max of 2 monitors (with separate displays, 2 monitors with no cloning). 3 monitors would require two nvidia cards in SLI. Only Ati can output to 3 monitors via one card.