Aquamark (DirectX 8)
Aquamark is no benchmark to determine fine differences in performance. Instead, it wants as much performance as possible. That's obvious here, as the results hardly differ at all.
The same at 1600x1200 - at clearly lower frame rates. Don't forget that Aquamark is one of the most spectacular 3D games to come - with amazing underwater graphics. I think that makes it clear that even a GeForce3 can be pushed to the limits.