Thanks for the replies! So I suppose there's nothing wrong with my setup (at least nothing fundamentally wrong). I use all the default settings, with AGP 4x.
Looking at graphics cards benchmark (like the one on Tom's Hardware), it seems like the performance of a Geforce FX5600 is inferior to what a GeForce4 Ti series card delivers. Don't know about GeForce3, but I wouldn't be too surprised if that's faster too.
Marcus, I couldn't agree more with the idea of a nice and fair database (how nice and fair it can be, that's another issue). Something similar to what 3D Mark provides would eliminate a lot of posts to this forum, and a lot of the existent confusion.
Would it be feasible to use SPECviewperf and this forum for such database? I don't think this forum is the ideal solution, but it's better than nothing.
P.S. I didn't try SPECviewperf yet, but I'll do it tonight and let you know how it goes.