I need an exact answer. I have a mega rig that I built. I have a DFI X48 mobo with two pci-e x16 2.0 slots with two ati hd 3870 video cards enabled in crossfire. My question is, I want to play games on three monitors (1 28 inch hanns g in the middle and 2 25 inch hanns g on both sides) I haven't purchased the 2 25 inch monitors yet, I want to know if I can play on all three monitors at the same time running in crossfire or not and if I can't run them in crossfire, will all three monitors resolution look good without crossfire enabled. All I want to do is game using all three monitors at the same time with the setup I have. Please help!
There is a software fix too, SoftTH, than works similar as Triplehead2go (although not as well and more complicated)
The problem you have here is 2 fold. You're running the 3870s, which are currently 2 generations behind, while gaming on 3 monitors which the size makes me assume you would like to game at 1920*1200 apiece ??
The higher the resolution, the harder it will be to push any good games with those cards.
I would recommend trying SoftTH for free, if it works for you, great, if not, it doesn't cost anything.
IMHO though, you are probably going to want to stick with the 28" monitor for gaming until you have a new 5XXX series card that supports Eyefinity.
In summary, NO, you can't use 3 monitors with CrossfireX enabled, YES you can use games without triplehead2go but not easily.