To test in Quake do the following: press the tilde key (~) to access the console. Type "timedemo 1" (without the quotes), press ENTER, then type "demo demo001" and press enter. The demo will load and run automatically. When it completes, access the console again by pressing the tilde key and you'll see your frame rate. It's a good idea to run the benchmark a few times to make sure you're getting a consistent frame rate.
NOw be careful in comparisons. There are so many settings that can alter the fps: for the basic resolution, detail, how mny colors (16 bit, 32 bit), marks on walls, simple objests, force model, sound quality, and this is only a few.
TNT2 is old technology compared to today's boards but if it works who cares. I have that in my son's machine. What a diff between a TNT2 and PII 333 compared to GF2 and Athlon 750. GF2 Pro by Guillemot is best value in top perfoming gpu's.
<b> Fragg at will!!! </b>