Speedfan – a useful utility to monitor voltage, rotation speed of cooler and temperatures of computer. The main feature of the software is to regulate the speed of rotation of the cooler depending on the respective temperatures, which enables to reduce energy consumption and background noise. Speedfan allows an automatic adjustment of the internal processor bus frequency and PCI bus. The software also provides the ability to display graphics of the change of temperature, voltage and fan speed settings and record the parameters to a log file.