Voodoo 3 3500 VGA
From Vogons Wiki
The Voodoo 3 3500 does NOT make use of a standard VGA or DVI connector. This is important as standard connectors will not fit and it won't be possible to connect standard display screens to the Voodoo 3 3500.
The Voodoo 3 3500 was originally sold with a blue break-out cable, but an analog P&D connector can be made to work, though often requiring some work to make it fysically fit. The P&D adapter (which is also known by a couple other names) has to support analog signals or it will not work.
The P&D connector physically resembles a DVI connector, but is slightly wider and has more pins.
Some more info about this adapter can be read on Vogons [1][2]