Well my computer is a Dell XPS 710 , Intel core2 extreme processor x6800 (2.93 GHz, 1066 FSB) w/dual core technology and 4mb cache, 8 gigs of ram, two nividia 7900GS running SLI, dual WDC Raptor 160 GB 10,000 rpm raptor hard drives striped. I run a samsung 226bw wide screen monitor at 1680 x 1050. I contacted Dell and they said that my system could run the ATI crossfire setup (hopefully they know what they are talking about).
I was actually looking at just one card I guess in my mind I was thinking my computer is setup to use two video cards would'nt that be the better way to go but then again I am by far no expert on the matter. I do know that the size of the card is no real issue the case they use for the XPS is huge its almost 3' tall and deep and at least 14" wide.