RE PIII 800 that video card is way underpowered for that processor, i would recommend getting a gforce 2gts
however the current one will probably perform adequately with that powerful a processor.
in fact i have a viper 770 which is a TNT2 32meg card
this card is 128bit and yours is 64bit.
These tnt2 were good in their day but the new ones do soo much more and do all the processing on the video card,
the tnt2 merely has a setup engine and the main cpu still has to do alot of work with it .
Bored, Certified tech
btw i would leave the other settings alone too 😉