TnT Riva 2 is faster than TnT Riva 1
GeForce 1 is faster than TnT Riva 2
GeForce 2 is faster than GeForce 1
So you're already talking about jumping 3 generations.
GeForce 2 MX is simply the slowest GeForce 2 you can get, and only really slows down on the big games. You might want to check the comparisons between all the GeForce 2's at:
www.tomshardware.com/
I'm waiting to see if running the next version of the Aquarium in 24-32 bit color will resolve the slight banding issues. If it does, I'm even happier, and will probably stick with my TnT Riva 1 for a while longer. It plays Quake 3 and Monkey Island 4. What more do I need?
I would like to see some FPS postings for the GeForce 2 MX. If you use the equation I used above, it SHOULD be 4 times as fast, giving 100fps or so at 1024x768.