Interesting, the Radeon 4850 does run quite hot, and to see it passively cooled ? I don't know just yet. But gigabyte actually claims it's cooler than the reference cooler, up-to 7 Degrees C actually.
The new SKU can be found under product code GV-R485MC-1GI and has yet another advantage, it has a framebuffer (videocard memory) of 1024MB. If there is one point in time where I like to see graphics adapters go towards 1024 MB .. this is it. The core clock will be set at 600 MHz and the memory at 1880 MHz.
BTW this would be one wicked HTPC card.