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Simply so, what is the use of thermal paste in CPU?

Thermal compound, also known as thermal paste and thermal grease, is a material used to fill the microscopic gaps between a computer's CPU and its heat sink. Thermal compound significantly increases the heat sink's ability to cool the CPU, allowing the CPU to run at a higher speed and improve system performance.

Furthermore, can too much thermal paste kill a CPU? Too little or too much thermal paste is not good. If the thermal compound is too thick, it will not even out between the CPU and heatsink. That means that the heat conductivity will be done by the thermal paste, not by metal on metal contact of the IHS and heatsink.

Beside this, is thermal paste necessary for CPU?

Thermal paste, or some oily thermal interface material, is necessary because it fills in the microscopic imperfections that otherwise trap air particles between the CPU and the heatsink, preventing the CPU from properly cooling.

Does thermal paste really work?

No. The truth is that properly applied thermal paste is an important component of a cooling system and going without it is a bad idea. It's also a good idea to service your CPU every now and then (once every year or two) and replace dried and cracked thermal compound with a fresh application.