The way you get heat is, well, by things executing -- be it the processor or the graphics -- and ventilation (or lack of it). You know, put a laptop on your lap and you get cooked? The thing has to have air flowing through it.
So, eliminate the simple stuff -- does the fan come on frequently? Is it sitting on a flat surface so air can get though it? That sort of thing -- the thing has to able to breathe.
Then you get to the fun part: what's running (and why)?
How busy are your CPUs? Just sitting there, your CPUs should be pretty much quiescent, somewhere around 1%-2% (not 50% or greater). There shouldn't be much activity at all unless you're doing something (or something else is doing something). How much "stuff" is running all the time (actually executing, not sleeping)? Take a look at top
and see what it tells you -- you should not see a whole lot of time on much of anything but X
or a browser you may have open for a long period (like hours or maybe days). Most things should be seconds or a few minutes in the top
Do you have GKrellM
on the box? If so, start it up and watch the display -- all your CPUs will show graphs of activity (there are a number of things displayed by default plus you can turn on additional information such as temperatures, fans, etc. It's a good tool for monitoring system load (and then you can go find just what is causing the load using top
or other tools). If you don't have it by default, it's probably available from a software repository or take a look at http://members.dslextreme.com/users/...m/gkrellm.html
Something you can do is shut down unneeded stuff -- looking at top
will make you wonder if you really need all these running all the time and you can start eliminating things. Running KDE? it's gotten to be a behemoth and there's a whole lot of fat clogging up your system -- disable if you don't need it or don't use it, turn it off. Try a different, leaner, desktop environment, say, Xfce
Hope this helps some.