There are some OEM Radeon cards , sold as ATI, but actually 3rd party, that are not recognized by ATI Win2000 or XP drivers. They have no brand, no website, no specific support. If you try to use an ATI driver, it does not recognize it. It might as well be a Savage 3d card to the ATI driver. They seem to be OK with ATI drivers in Win98. The surprise comes when moving the card to an XP system and installing the full XP driver.
This situation is in addition to the normal driver teething problems we hear a lot about.
Does anyone have a right to be vexed with ATI for allowing such a shoddy second tier situation? I would say yes.