diky moc, ja som našiel toto, preto som zneistel:

"I have 2 external monitors(mini displayport & HDMI) that I'm wanting to use on my nVidia GT 555M 3GB video card, but when I try to use all three monitors in the nVidia control panel, it says "This GPU supports up to 2 displays"

"All current and past NVIDIA cards (that I know of) cap out at two simultaneous displays. Hence you need two cards in SLI to run stuff like NVIDIA Surround. It's a basic hardware limitation of the card."