This is wrong and misleading information! The min. freq. is the one used for low load, like updating widgets, decoding MP3s etc. In his case the permanently high load at 1GHz probably killed the battery but the brain dead 850 minimum is a sign of irresponsibility and how little he understands this device. If we had access to the core temperature it would be one factor that determines the damage of the SOC. Several people here mistakenly believe that this sensor value would indicate the CPU temperature. I does NOT! If your device gets really hot, than it's a sufficient, but not a necessary sign that you're doing something wrong. So don't just rely on the temperature. If you believe temperature doesn't matter, please perform an experiment and bake your N900 in an oven @200C. It may void your warranty, however...