i have a ga-5aa w/k62 500mhz,128mb and a tnt2 m64 AGP. y is it when theres alot of things on screen it slows down into 10fps. but then when its theres nothin much on screen it goes like 30fps. what has a major impact my cpu or my videocard? it also happens 2 quake3 and collin mcrea rally 2.