Just thought I'd mention that the same thing happens with my Monster II Voodoo2.
I believe Anandtech was able to run some CPU bench marks using SMP in Q3 WinNT4.0 www.anandtech.com
The drivers that I am using are NT4.0 OGL drivers, so they must be Multythreaded. Otherwise, My best guess is that Q3 SMP isn't working on WK2000 due to the OS & not the drivers, or perhaps because the NT4.0 drivers were not intended to be 100% compatible with WK2000 (multythreaded or not).
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Racer Raul
NT Server Ops Admin
Intermedia Communications, Inc.