I just wanted to let you know that if you want to max out the cpu(s) you don't really need to start opening programs and stuff (since that will only max out the cpu temporarily anyway
).
The best way to do this is to open two terminals and type:
yes > /dev/null
... into both. Each instance of yes (which is kicking it's output into /dev/null, aka, 'nowhere') will use 50% of the processing power on the system since there is two cores.
Just 2 or 3 cents to maybe make future heat testing easier for you