well in posts and internet websites, i read that the ARM processor can scale up to 1ghz. nokia locking the default to 600mhz is maybe because: -the CPU may not be damaged @1ghz and up but in battery operated devices, its different. you might blow your battery up before you melt your CPU -the CPU may not be damaged but the mother board might (overheat and overvoltage may be the reason) IMHO!!!