Computer systems have evolved a great deal in the recent. In the earlier times of 1970's or 1980's systems were designed in such a way that there was not a great chance of modifications except for adding some floppy drives or the memory. Such was the limitation of the modifications that the system manufacturers were sure about that this system would produce this much heat only and thus designed according to that. It worked perfectly also. Then in the 1990's the equation changed altogether and the manufacturers found out a great market by offering various up-gradations in addition to the already available CPU's.
The peripherals that were added required the installation of larger power supplies and the circuitry was reduced in the size. As the size of motherboard and the system was kept similar or even reduced, this lead to the problem of heating up of the systems. The users wanted to use the every bit of the system resources without investing in the resources. Therefore, they used the advanced software's designed for higher configuration and this lead to the Over-Clocking and Over-Volting of the components, this lead to more heat emissions.
First solutions that emerged were that you could find these temperature related details in the BIOS and then set the alarms as well as actions accordingly. However, this could be done only in the BIOS but not when the system was running the operating system. Then came the software's that displayed the temperature and fan speed related details but all the actions to prevent heating have to done manually by the user. If the user was not at the kernel then the overheating could not be resolved. Then in the third generation monitoring solutions came the software that allowed users to set the desired action that needs to be taken when the temperatures crossed the limits. These software's directly interact with the sensors of the motherboard and circuits controlling the fan. In today's time motherboard manufacturers provide this software free of cost and are very easy to use.
For windows third generation monitoring systems have the software's like SpeedFan and Hmonitor while in Linux you can find GKrellM and KSim.
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