i had a tnt2 m64 pci card, and my friend had the exact same agp card. The agp could get 70 fps in q3a demo 1, while the pci could only manage 35 or so, even overclocked and tweaked.
i think this is due to the limitations of the pci bus. AGP is the far better option, but it may depend a lot on the processing power of the chip also.
Get tntclk and put ghetto ramsinks on that tnt (ie glue flat bits of copper/aluminium to the ram chips) or even better cut up some old p3-style heatsinks and glue them on, and overclock that card to hell together with your fastest processor, you should be able to get decent performance.
The upgrade treadmill is seriously fux0red, you dont really need to spend megadollars to get decent performance IMHO.
oh yeah and try some of the older nvidia drivers, 6.50 was a good one for tnt.
~ShiFtY out~
