Is there any risks ?

These are the risk that there are if you decide to overclock your computer. There is probably some other things that has happend but these are the most common ones.

Your CPU could be damaged by 'electromigration'. Electromigration takes place on the actual silicon chip of your CPU in areas which operate at a very high temperature, and can cause permanent damage to the chip. CPUs are designed to run at temperatures between -25 and 80 degrees Celsius. Electromigration does not immediately damage your chip. It is a slow process, which more or less shortens the life span of a CPU running at a very high temperature. A normal CPU is meant to live for about 10 years. If you want to be kept free from this electromigration scare, you have to do as much as possible to cool the CPU. These terms don't necessarily apply for Cyrix, IBM, and AMD CPUs. Because of the already high rate of heat production at their original clock rate, you must work extra hard to keep them cool in overclocked conditions. There`s also the risk that your motherboard will stop working. I have never heard about a cpu from intel that want to the garbage bin after overclocking but I have heard of several cpu`s from AMD and Cyrix that went that way. Even a few motherboards has gone that way.

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