I'm trying to find some drivers for my rev c iMac. The current ATi drivers for this x600XT seem not to support vertex or smart shaders. Practically, this sucks! I have looked around the ATi site and found the latest Mac drivers (https://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&folderID=27 ), however the x600 series is not supported. Anyone shed any light on the matter and help me find some drivers that work. Just posted a ticket with ATi, awaiting their responce.