Sad day indeed, like a proud warrior..
But why is it 90+ temps, my reference one is 3 years old, still pumping out 386kH/s, 45% fanspeed 75C tops.
Don't tell me you didn't clean out the dust once in awhile. Poor card!
I don't have a 5850, but I do have a non-reference Sapphire 5870 mining 24/7 at stock speeds. Even with the case open and at 100% fan speed, the temps easily pass 90*C in the winter with ambient temps less than 18*C. I had to undervolt it to get the temps under control.