Help with CrossFire Setup

NX1000

Junior Member
Jan 30, 2008
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I have an ATI X1900XTX and a mobo with AMD 580X CrossFire Chipset. What are my options for adding a CrossFire card? I know about the X1900CrossFire, but do I have to use a CrossFire Master or can I add a second ATI X1900XTX? Will a X1950 series work?