I am running a dual pIII 500 and it works great. I have the Oxygen VX1 and I must tell you that it is an excellent card, however operating system does make a difference in performance. I use it with NT4 but I have seen it used with 98 and it seems to run well. Best of all is it is a very fast card, however it does not have the fill rate of a Geforce or Voodoo card, it does however have GREAT texturing and Polygonal correctional tracking abilities. "No missing polygons etc...." There is no doubt that it is a good investment.