using HR03GT on 6800 ULTRA, so far so good.
stock condition+120mm FAN direct blow, ambient +/- 26'C, fan noisy like 5 people typing in an office.
idle:59'C, gaming:75~80'C sometimes the graphic card hang for a while because too hot.
with HR03GT, ambient +/- 26'C, no fan..., only can hear the PC running quietly.
idle:65'C, gaming:80 above'C, still running the game, but lag...
HR03GT + 120mm FAN in constant speed around 1200rpm direct blow, you still can notice the fan running, but quieter than the stock fan.
idle:55'C, gaming:~67'C
just for sharing~