Here's a post I spotted over @ Futuremark's Forum! Posted by Prodigy with photo's:

Hi guys.....Got hold of a Geforce FX today but I don't know whether it's the ultra or not. I'm not wanting to put the card in because to be honest I'm happy with my current card - I'll just give this card (for a small fee) to a friend. I want to know whether it's the ultra or regular though without firing it up (because I don't want to mess up my ATI drivers.

Any way to tell?

Cheers