Did you make sure that you disabled integrated graphics (if you have them)? What kind of computer are you running? Did you disable the Windows drivers for the integrated graphics as well (again, if you have them)? I had an eMachines that was donated to my design studio (certainly not MY computer
), and it didn't have any BIOS option to disable onboard video, so I had to boot in Safe Mode and disable the drivers that Windows had installed for integrated graphics.
Btw, I'm using a FX 5200 with no problems. I really like it because it is a relatively decent card that has dual-VGA support built in!