Atlast a non-reference HD4770 from Gigabyte and guess what, it comes without a cooler and has a massive silent heatpipe design and 1GB of GDDR5 memory. Get ready for a new leader in sub10k cards.
*img197.imageshack.us/img197/1181/116a.th.jpg
Also announced is Powercolor HD4770 with Passive heatsink.
*www.techpowerup.com/img/09-06-03/4770_scs1.jpg
*www.techpowerup.com/img/09-06-03/4770_scs2.jpg
That heatsink is MASSIVE!!
Personally, I don't see any use of passively cooled 4770 as if you don't have fans blowing out of case with that card, then all the heat will be dumped inside the case, not good at all. And if you already have a fan blowing air out, then you should also be able to bear the video card's noise considering the size of the heat-sink.
Also, you don't want to do gaming with something passively cooled and a 4650 is plentiful if you want something passive to watch blu-ray and for LPCM.