I have done some bechmarking of a lot of drivers in my voodoo3 2000. This benchmarks have been made in 3dmark 2001SE in Win98SE with dx9.0. In each driverset, I have used the best image quality settings, so in each driver, there are different options in the 3dfx tools, which more or less are the same. If one of the driversets had more options than usual, I configured them to gain the best quality avalaible so, maybe, the benchmark is a bit subjective.
UPDATE: My configuration in 3dMark is: 800x600x16; 16bit textures; NoAA; Triple buffer and 16bit z-buffer.
Anyway, this are the results:

First, I have separated the results, depending on the d3d core:

1st: d3d version: 4.13.0028

-x3dfx 1.07.00 for v4/5 :2558
-Nudriver 5 for v5 5500 (+) :2561
-Mikepedo 1.1 :2560


2nd: d3d version: 4.13.0027

-3dfx 1.07.00b :2554


3rd: d3d version: a mix: 3dfx32vs.dll:4.12.0777; 3dfx16vs.drv: X-ForcedGL II file

-Xpentor X-ForcedGL II MIX :2696


4th: d3d version: 4.12.0666

-Omega 1.03 : 2733
-Voodoolizer 1.06.00:2736
-Amigamerlin 2.9:2729
-C-3dfx 1.1  : 2733
-CA´s 1.08.00  :2740
-Cuneyt adjusted driver :2733
-Cuneyt special driver  :2743
-3dfx 1.07.00 : 2739
-x3dfx 1.08.03 :2741
-Outsider driver: 2737
-Papyx driver (+) : 2700
-Solid State´s driver : 2741
-3dhq beta9 :2740

+:The screen is moved a bit to the right

Well, here finish the benchmark, I just felt curious about the performance of several drivers
:)

seems like the cuneyt drivers have won..anyway, did you try some games?

for those who speak/read german, here's a driver comparison (voodoo4/5 based drivers only) as well:
http://www.voodooalert.de/content/dokumentation.php
--> check 1^st download button..

Still no games tried, I´ll try another day when I have more time to do it ;)