Also...here's a website of recommended and certified Graphics cards for the Autodesk Revit software (BIM). Based on your initial response would any of these cards work with my system...
Thanks for your help. I have an AMD Athlon 64 X2 Dual Core Processor 5200+ 2.70 GHz with 8GB RAM. My PSU is is a 370.5W Coolmax Model:AP-450X(CX-400B).