FAQ, support multiple monitor 3 or 4 using dual video card SLI or Crossfire

Hi,

I would like to ask if someone has knowlodge or perhaps own/experience this kind of a machine, Im buying a desktop with a plan of having multiple monitor 3 or 4,now my question is, i want to used the sli or crossfire config with each video card has 2 dvi or vga connector, does this 2 connection wil help me achieve my goal of 4 monitor. 1 monitor each dvi or vga ports. How about in our lovely linux OS this will have no problem right.

I hope someone out there would be kind to share his/her knowledge or enlight me as to what i planning to achieve..

Thanks in advance for future input..

Addition: I just read, i can use 4 or 3 using 2 video card but the video card is capable of multidisplay.