I bought a $15 "BMW"
The "BMW" let me switch the "turbo" mode of my LibreOffice compilation. Normally my Dell
Vostro i7 takes 5 or 6 hours compiling LibreOffice with the internal cooling system, too weak to push the heat out of the notebook case.
From a trottled 1,2GHZ in all 4 cores to 2,9 GHz. Now my compilations takes around 2 to 3 hours.