at ATI's website, unless its an older model. Can you expand a litte on the card?

https://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&folderID=293

That site may help. Since it is a little older, ATI doesn't directly link the driver, but a talk with a support rep or a deep look through the KB and you should be able to locate it. Also, what Operating System are you running? I've looked at some other sites, Omega Drivers, rage underground, but I can't find your card. I think the best idea is to contact the support rep.