ADAPTER 3.3AGPtoAGP1.5 PROTOTYPE COMBO RISER / ADAPTER: (Exclusive and  very rare).

The idea shows up when I talking with my friend Igor from Russia. He needed for his project an AGP riser for fitting correctly his VGA device into his special motherboard. Then we started to talk about idea to build an AGP riser and I wanted to see if is possible to build an adapter for my old school 3Dfx 3.3VCards for playing in modern motherboard with only AGP1.5V support. We started the project and the result below.

• This is an adapter I built this year for my baby V5-6000. It is based for 3.3V AGP VGA DEVICE. With this adapter you can use your VOODOO AGP 3.3V in a new motherboard with AGP 2.0/3.0 support. This new adapter has been tested V3-3000 AGP / V5-5500 AGP & V5-6000 AGP.
• About compatibility- I have found my adapter is NOT 100% compatible with all the motherboards I tested (motherboard protection when a pure agp4x is not plugged in).
  
• This adapter can be used as AGP RISER also  across jumpers caps. It is compatible and perfect function  AGP1/2/4/8x VGA cards.

33AGPtoAGP15 + V5-5500 + DFI NF3 ULTRA AGP4x

33AGPtoAGP15 + V5-5500 + AMD SOYO KAUSA DRAGON ULTRA "ALI" AGP4x

33AGPtoAGP15 + V5-5500 + DFI NF3 ULTRA AGP4x + WinXP

33AGPtoAGP15 + V5-6000 + DFI NF3 ULTRA AGP4x

Actually selling those devices on ebay but if you want to buy it outside from ebay for sure price will be more friendly.

Good luck!