I do not overclock it constaltly. I found cpufrequi to be much better, I only overclock it for specific functions. Like psx4all, maybe vgba, youtube on microb etc. But from my experience it doesn't get hot a lot, even when playing for an hour @ 900mhz. Now wi-fi on the other hand gets my N900 very hot. If I browse for an amount of time, the device gets very hot. So if the N900 was designed to withstand the heat of wi-fi (at least I hope it was), I am sure that heat won't be a major issue for the processor.