the heat can be easily suppressed by using CCC or RivaTuner to adjust the fan speed and applying a better thermal compound such as TX-2 or the new OCZ FreeZe stuff on the core. My HD4870 was running pretty hot, around 65-70 idle. Once I adjusted the fan speed the temps dropped into the high 50s which I felt was still a little toasty. Once I applied some OCZ FreeZe to the core I saw my temps fall even further, into the low 40s.