As with the TNT2-based products in these benchmarks, the 3D Prophet levels out during the more realistic representation of actual gameplay in Crusher. Scores are almost identical across successive resolutions until hitting 1600 x 1200 where they fall off significantly.
The hopes for GeForce 256's stretching of the usefull life of your older CPU seem to be born out by our performance percentage comparison (below). While the raw data scores of the 3D Prophet on an Athlon 650 vs. a Celeron @ 450 still show a difference of over 20 fps (with the exception of 1600 x 1200), the percentage increase in performance that will be experienced with a 3D Prophet is shown to be higher for the Celeron @ 450 (shown in yellow) than for the Athlon 650 or P3 600 (show two-toned blue).
Don't misunderstand, the raw increase in fps is nearly the same for all three CPUs. However, as the original TNT2 Ultra scores on the Celeron are lower than on the P3 or Athlon, this translates into a larger percentage performance gain for the Celeron CPU being represented.
The dramatic change at 1600 x 1200 (virtually double from that achieved at 1024 x 768) in performance percentage increase across all three CPUs illustrates the advances in performace for older OpenGL games at higer resolutions.