Need for Speed thinks my 6800 is a TNT

[Ketchup]

Although an old game, I still enjoy playing Need for Speed Porsche Unleashed. Only problem is it only offers me 16-bit color options. Upon further investigation, I find out my card is being detected as a nVidia TNT card. Anybody know how I can get 32 bit color in this game? I didn't have any problems with my geforce 4.