Where I regonize which voltage 1,5V/3,3V grafixcard or motherboard supports if manual doesn't say it? Which voltage Riva tnt2 uses?. I heard that some motherboards supports both voltages??
I got lots of old hardware and I have to know is one compatitle with another.

http://faq.tweakers.net/vb/AGP_config.gif

Motherboards which support both 1,5V and 3,3V have so-called Universal AGP.

To know what type of AGP your Riva TNT2 has, just compare it's AGP connection to those in the image.

Be sure that the nVidia Riva TNT 2 is an 3,3V card too! Some cards are configurable (Some versions of the Diamond Viper V770 Ultra for example). Those cards will look like an AGP4x card but work like an 3,3V AGP2x card. No to mention the cards which look like AGP4x cards but don't have AGP4x capability at all  ::)

Some interesting information:
Click  (Mirror) :)

Thanks! You both helped me a lot :)