What's the difference between all the other company's selling the Geforce4 TI4600? For example Asus is selling the Nvdia Geforce4 GPUS V8460. What's the difference between the regular Visiontek Xtasy Geforce4 TI4600 and the one with Asus? I have a Asus P4T-E motherboard so would it be better off buying the graphic card from Asus or Visiontek?