i'm just going to throw some ideas out in the air, some may have no corilation to graphics performance.
- maybe the nvidia card could be conflicting with the motherboard chipset or BIOS type and version.
- drivers could be conficting
- motherboard resourses could still be dedicated to ati graphics drivers
- OS may play a factor
- windows updates are either not updated or the previous ati updates (if any) are still installed and conflicting
- not sure if this could even count as something wrong but: installed games (including steam) still see and are performing like ati drivers
- hardware might be restricting performance, like not enough ram for Geforce but was enough for ati (dont go out and buy any cause i suggested that), or agp slot is 1.1 instead of 2.1, but i believe that the 9800 is 2.1 version agp
umm, cant think of anything else, if i do i will post. i dont know, hescomingsoon probably knows more than i do.