The Voodoo5 5500 has lots of potential to go higher than it can reach out of the box. It's all up to you to make sure it performs to its fullest potential. The first place you can start is not the card itself, but your system´s settings.

Have you made sure unnecessary programs and background functions are closed or disabled when you play your game? Have you made sure all your other devices have the latest drivers?

These things don't have anything to do with the card itself but they can definitely affect game performance and lag graphics, making you think that the card is the culprit, when in fact hiccups and chops have nothing to do with the card at all.