This program is one of the best hardware sensor programs that allows you to check the temperature of any component on your computer with a sensor. It also has alarms that can be set when the temperature goes too high and even has built in software cooling.

Hardware sensors monitor utilizes sensor chips on smart motherboards to track system and CPU temperatures, voltages and cooling fans. By quickly catching an overheated computer, you can prevent disasters such as system instability or damage. The program is resource friendly, resides quietly in the system tray, and continually monitors the various parameters. By clicking its icon, you'll view real time values for each component. Hmonitor supports all Windows OS: Windows 9X/ME/NT/2000/XP/2003/Vista, inluding X64/EM64T editions.

Hmonitor Pro advantages
-- Win95/98 Idle Control - significantly decreases your CPU temperature when the system is idle.
-- CPU Throttling - restricts CPU performance and heat production, when the CPU becomes too hot.
-- nVidia GPU hardware monitoring - displays hardware monitoring data for several nVidia based 3d-accelerator cards.
-- HDD's S.M.A.R.T. temperature monitoring - displays drive temperature for modern EIDE/SATA harddrives.