Sapphire announced a passive 7770 in June, but haven't released it, yet. Asus Direct CU
and Sapphire Vapor-X
get high marks from Techpowerup. Here's another Sapphire review at ht4u
that gives more stringent noise testing.
Nvidia is being pokey with their 6xx midrange product releases. The GTX 660 Ti is expected on Aug 16...but will compete more with the HD 6870-6950 range. However, it *might* cause an HD 7850 price drop (decent versions are in the $250 range now). The GTX 650 and 650 Ti aren't expected until this fall...sometime and would be the 7770/7850 competition.