Thanks, I get it now. I think I'm going to get this instead:
EVGA 256-P2-N761-AR GeForce 8600GTS 256MB 128-bit GDDR3 PCI Express x16 HDCP Ready SLI Supported Video Card
http://www.newegg.com/Product/Produc...82E16814130084
I think this will work better for CAD.