I have an Inno3D GeForce 8800GTS, which I use to run two monitors, and now I need another graphics-card to support a third (and possibly later a fourth) monitor using DVI.
I thought any PCI-Express x1 card would do, so I bought an ATI Radeon X1550. But I now see, that is not going to work, since apparently NVidia and ATI can't co-exist. If I make one the primary, the other one is disabled and vice versa.
XP is nice about 2 different video cards. Vista requires that both cards use the same driver - so they must be the same generation of card. Nuf said. PCI-E x1 cards are few and far between which is dissapointing because i was trying to do the same thing. Look at PCI cards instead. the best PCI card will perform roughly the same as an x1 card - not so great, but you get the display and thats what matters.
Stranger options exist - You can get a USB video adapter but it won't do high resolution or play video very well. Again, you will be able to use a second screen so it depends on what you are doing.
I need the third and may later fourth screen for playing many pokertables at once, so it is not very demanding graphics-wise.
strpdgato>> I get a rundll32 something error, and a message that some drivers do not play nice (can't remember the exact wording).
rockbyter>> I have read this other places as well - that Vista needs to use the same driver. You say "same generation" - could you give me an example of a PCI og PCI Express card that could use the same driver?