mine is always around 1800 rpm regardless of internal temps. i spiked both cores of the cpu to 100% for 5 minutes (cputest), and the cpu temp got up to 164F (73C) from an idle temp of 100F (38C), but the fan was still 1800 rpm. i played a bunch of 1080p trailers simultaneously to give the gpu and hdd a workout while transferring a few gigabytes via wifi. fan still stayed around 1800 rpm. during the 2 hours while the migration assistant was doing its thing, the top of the mac mini got fairly hot. not scorching hot, but noticeably warmer than idle, while the fan was still quiet as usual. i could feel really hot air coming out of the rear vent, but the fan wasn't blowing harder than usual. i'm assuming it was running at 1800 rpm even as the hdd was generating some massive heat. this is very troubling to me. has anyone seen the fan increase in speed as temps rise in the latest mac mini (macmini4,1)?