One nice little addition to UT2003 demo is that it has a built-in benchmark utility.  You can find the benchmark in the system subdirectory for the game after it installs. 

The file is appropriately named 'benchmark.exe'.  Run this file, select the resolution you want to benchmark, and it will go through 4 different demos, 2 are "flyby" and 2 are "botmatch" demos.  The flyby demos give you an idea of how high frame rates would be without bots, while the botmatch demos give you an idea of what kind of fps you can expect while actually playing the game. The benchmark actually leverages more cpu and graphics intensive technologies that the engine is capable of.

We recorded our own time-demo and what you in numbers are looking at is the actual in-game performance of our own recorded timedemo.