I have a Gainward 8800 GTX Golden Sample gathering dust here. Only thing that concerns me is the power draw ( up to 185w ).
@H-B, specs are here;
http://www.gpureview.com/GeForce-8800-GTX-card-474.html
Would you check em out for compatibility, I'm sure all is fine if only our friend can supply enough power !
Best regards.
Fubar2Niner