Accidently found a new video card review from GameSpy, which compares GFFX5900U to Radeon9800Pro 256MB. I haven't read any hardware-tests from there before but I liked this one. It's not very technical nor long nor filled with tests but from "gamer's point of view" it's good reading. It also touches the driver optimization-thingie.
http://www.gamespy.com/hardware/june03/videocardshootout/index.shtml
http://www.gamespy.com/hardware/june03/videocardshootout/index.shtml