Sure.  Here's the easiest way:

In terminal do:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies

this will give you a list of what speeds your processor can run at.  make note 
of them.
now in the terminal do:

sudo aptitude install sysfsutils

once it's done installing that, do (again in terminal):

gksudo gedit /etc/sysfs.conf

That will open a file, you need to add the following lines to that file
(at the end of it):

devices/system/cpu/cpu0/cpufreq/scaling_governor = ondemand
devices/system/cpu/cpu0/cpufreq/scaling_max_freq = MAX
devices/system/cpu/cpu0/cpufreq/scaling_min_freq = MIN

but replace MIN with whatever number was smallest of the available_frequencies 
in the first step and replace MAX by a number from available_frequencies that 
seems reasonable (I use 600000 for MIN and 1000000 for MAX, i.e. 600MHz and 
1GHz).
Then save the file and restart.

I pretty much used trial and error, lowering MAX (make sure it is always
set to one of the available_frequencies values of course) until there
are no longer overheating problems.

-- 
CPU overheats during high usage "throttling <not supported>"
https://bugs.launchpad.net/bugs/22336
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