And here, I'm happy I decided 18 months ago that the 4850 was a good deal, if it's still powerful enough to be considered 'upper mainstream' in a world where cards twice as powerful as what came before come out every 9-12 months.
My only regret is that those early models were soon forgotten by their makers, and they need heavy tweaking to get the juice out of them.
The huge cooler I put on it made it much cooler (the original cooler failed), and virtually silent. The VBIOS hack I applied, reducing frequencies to 160/500 MHz, 0.92V at idle may have helped in the power draw department (it sure helped before the cooler change, by lowering temps from 80°C to 65°C), but probably not as much as these more recent cards.
I'd love a similarly tweaked 4850 (more recent models actually offer most of these out of the box: dual slot cooler and tweaked freqs/voltages) being fully benched against these.