VisionTek RADEON HD 3870 X2 Video Card - 1GB GDDR3, PCI Express 2.0, CrossFireX Ready, (Dual Link) D Graphic Card "working 2005 crossfire" Questions

...CrossFire? to work properly. My acid test for graphics cards is still trying to run Quake4. I tried it at "High" setting and it starts fine but eventually crashes about a minute into the intro movie. ...