nwc, i'll give you a small example of something...
my AthlonXP 1200+ w/GeForceFX 5200 64mb will show a ball on a 50x50 matrix in DBP @ 300fps
the same machine with my GeForceFX 5900ti 256mb will do this at 3,200fps
with a 3ghz processor particularly a Pentium4 no doubt with HyperThreading ... you'll probably be looking at the same test producing almost 4-5k frames/sec.
ALOT of the graphical power from such a powerful machine comes from the GeForceFX card.
to give you some idea of that speed difference in technical terms, my FX5200 (which isn't a slouch!) is capable of pushing 63million vertices/sec which is roughly 250,000 triangles/60fps
the FX5900ti is capable of 365million vertices/sec which is just about 2.5million triangles/60fps
this is no doubt why it quite clearly states to ask you to find someone to test this game on, DarkBASIC developers won't have to worry much because although yes it runs faster ... you really can't get that much speed out of it, it just becomes more and more stable frame rate the faster the system you have.
but pro developers will definately have to watch out and develop with a much faster system in mind.