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. ~flipper <lord.flipper at gmail.com> writes: > Well... the readout on the Processor/Controller bottomside is > 138.2F/59C > > The processor bottom, itself: 135f/57.2C and the power supply is at > 144F/62.8C > > An uneducated guess says I'm 7-10 degrees F, over the suggested > operating range on an Aluminum 1.25 15"... that sound about right?