I have 2 XFX HD6870 cards in crossfire in my system but when I try to connect three monitors only two if them work. I am using the DVI ports, two on one card and one on the second. I can run two no problem and can swap the third with one of the two and the monitor itself works fine so I know the monitor itself is working just cant run 3 from the dvi. Is there a solution for this problem?
There is a solution to your problem.
To run more than 2 monitors in eyefinity you need either a native displayport monitor or active displayport adapter. In your case you will be using DVI ports to you will need an active displayport adapter.
Here is one - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Get the adapter.
Then hook up your monitors, 1 via dvi, 1 via dvi, 1 via active displayport to dvi.(By the way hook all of them up to the same video card.
I got the mini dvi to dvi adapter but I still cant get the three monitors to work properly. I am wondering if there is a setting somewhere I can change or something I need to do in order to get these things working.