I'd see if tomshardware.com has them on the list. Example list at:
The 6670 is there, see if the others are there.
So I'm buying a gaming PC and I've got the choice between these two graphics cards. The PC with the ATI 6770 is only 10 pounds more, so cost isn't a major factor in my choice (unless of course it's a rip off or a bargain). I'd like to know which is the best of the two cards, as I'd like this computer to stay around for as long as possible before I have to upgrade.
Both PCs have similar specs otherwise, but I'll list them both here anyway: