Windows drivers are generic drivers. It doesnt matter WHAT (version of Windows is installed, or WHAT the device is).
They're limited in what they can do.
It's like printer drivers. Windows 8 may have some of the latest printer drivers already. It doesn't mean everything on the printer (like printing / scanning) is going to work with them
Which can be a bugger if the manufacturer's site doesn't have Win8 drivers. Even tho some sites say Windows 8 has built in printer drivers
You maybe stuffed, if you want to use all of the printer's functions. You may have to buy a new printer, that's got Windows 8 drivers on the site
So, yup if it's an AMD/ATI card, its better if you get them from whatever site. I wouldn't rely on the WIndows drivers.
The only driver I've downloaded from Windows update is the ACPI one, thats about it And the mouse / keyboard. Which haven't affected anything. Anything else, I would go to the manufacturer's site.
I wouldn;'t rely on Window update for ALL drivers. They can stuff things up