ASUS PC Probe is a free program that able to monitor vital information in the computer such as fan rotations, voltages and temperature, if you use Asus motherboard  you can  use this program.

Also ASUS PC Probe can give system information such as hard disk space, memory usage, CPU type and processor speed.
After installation, the application resides in the taskbar and provides audio warning through the PC speakers if certain thresholds such as temperature and voltage have been exceeded.

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