but the graphis quality could be better ; i mean that all textures in the game are not "jucy" and generaly graphis looks much diferent than on for example Gf4 ti200 (i know that the technology gap is big) but i saw some screenshots made on voodoo 5 and it looked satisfactionaly (for example http://www.3dfxzone.it/enboard/topic.asp?TOPIC_ID=1320 )

is this posible to have similar quallity to this on voodoo 5

voodoo5 can run doom3 with better image quality with a special version of mesafx but that wont work on voodoo3..so no,its not possible to have a better image quality on your voodoo3..