It isn't on the supported card list, Raaaid. On the other hand, it can't be worse than your existing card. Personally, I'd have suggested trying to get a card on the list, but it is your choice. Good luck!
Edit: found someone else using a 1GB 4650:
http://forum.1cpublishing.eu/showpos...&postcount=228
http://forum.1cpublishing.eu/showpos...&postcount=125
It looks like it will work, but don't expect too much...