I am looking for a possibly silent (at least when idle) HD4850 based card . For most of the time I'm not gaming so the idle noise is top priority, I am also prepared to spare some more money for the silence. However I would rather not install any custom cooling.
Being an occasional gamer doesn't mean that I want to compromise performance since when I can devote some time to playing (even if rarely) I'd like to play the newer titles hi-res.
the stock reference 4850 from any manufacturer is quite quiet with the fan speed at 40% and lower. at 40% it does a fine job cooling the GPU, especially at idle speeds.