Kynan Shook wrote: >An easy way to tell is to use ThermographX, >which can show you the temperature ranges for >other people's computers alongside your own. >http://www.kezer.net/thermographx.html > >However, without consulting that program, I'd >say that your temperatures are probably in the >high end of the normal temperature range. Most >chips can withstand a temperature of about 125°C >(that's the internal, or junction temperature), >though CPUs tend to have a slightly lower >maximum temperature, around 105°C. >Unfortunately, there's no easy way to find out >how this corresponds to temperatures measured by >the OS, which are often thermal sensors attached >outside the chip, so they will read less than >the junction temperature. >Also, keep in mind that the sensors used are >generally very imprecise - some of them have a >range of accuracy of as much as +-12°C (22°F). > >In general, the computer should reduce the CPU >speed itself and eventually go to sleep if it >thinks it is getting too hot. >Generally, this means a hardware malfunction - >under normal conditions, the fans can easily >keep the machine within normal temperatures, >even if the case feels quite hot to you. >Remember, the case feeling hot is really a >*good* thing in some sense - it means that all >the heat you can feel is being carried *away* >from the processor. Thanks Kynan, I'm not really alarmed. The powerbook is running great. I was aware of the 'good news' re: the heat being dissipated, and the case feeling hot, as a result. It's interesting. I've noticed the processor (underside sensor) and the proc/controller (also underside) will drop about 10 degrees F, when the Powerbook wakes up from 'sleep' and an app runs. Seems a bit odd, but one never knows. brian s