Actually TV out does help.
The 3500 had a connection for an octopus dangle type thingamabob.
No svideo on card. TV out and everything was done through dangle.
The 3000 had just a normal svideo output. No composite. No dangle connector.
Here is a 3000PCI, without TV out.
3000 AGP looks identical except has svideo out and a heatsink without fan.
3dfx 3000 PCI
It's easy to find 3dfx info.
Just type use IE's search and type in the address bar stuff like:
3dfx 3000
or
3dfx 3500.
or whatever.
Lot's of photos.