I have had no trouble with the demo with either of the two video cards I have tried. (Viper V770 and Voodoo3 2000). From what others have said (search) it seems to depend on the video drivers used. I used the 3.66 drivers for my TNT2 if I remember correctly. Also you will want to make sure that no other apps are running as background tasks (ie: Seti@home, RC5 etc.)
 
Ed

I got SOF demo working..
 
SYSTEM =
BP6 with 2 celly's
V3 3000
 
I used the latest drivers off the 3DFX site.

if you are in windows 2000 i heard that it dident work in administrator mode, you have to be a power user. that worked for me.
 
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Amd k7 500 w/ 3dnow and mmx. :: 192 mb sd100 ram.
Biostar m7mka mobo. :: Maxtor 20 gig hardrive :: quantum fireball 4 gig hardirve :: 32x toshieba cd rom. :: 2x write 4x read phillips cdr w/ adaptec scsi. :: Winfast nvidia geforce 256 ddr 32mb w/ tv out. :: Diamond monster mx 300 Sound. :: Standard Floppy. :: 5 speakers including a subwoofer. :: Us robotics external 56k modem x2 v.90. :: Intellimouse explorer. ::
Standard gateway keyboard. :: 17 inch gateway ev700 monitor. :: Epson stylus color 600 printer. :: Info scaner. :: D-link 10/100 mbit ethernet lan card. dfe-530tx+ w/ wol. :: Windows 2000 Professional.

SOF demo worked fine for me in win2k pro and i was being the admin.
 
AMDk6-2
voodoo3