n9800gx2

I am thinking of fitting an ATI HD4870X2 card to my system to replace my Nvidia N9800GX2 as my mobo is Crossfire. I might even fit two of these cards but was wondering if there are any known issues with Vista or these cards for a crossfire setup. You can see my system specs below. Phil.

I use an Nvidia N9800GX2 1gig card on my system but my mobo is for Crossfire. As the N9800GX2 incoprorates 2GPU's is this this the equivalent of an SLi configuration?? I ask this as when i go into the Nvidia Control Panel it recomends that i set it as Multi GPU mode and have done so. When using...