.

Just so, is liquid cooling necessary?

Liquid cooling is the best way to cool a CPU because water transfers heat much more efficiently than air. Liquid cooling also makes your PC run quieter because you won't have fans constantly running at a high RPM. However, liquid cooling a PC can also be dangerous if water leaks onto hardware.

Subsequently, question is, does liquid cooling run out? no, they do not run out of liquid.. there's still a certain amount of overtime evaporation which it's in fact more related to become somewhat "thick and dry" liquid but it take really a lot of years to achieve a point where it really matters..

Also Know, what kind of liquid is used in liquid cooling?

Liquid cooling is a highly effective method of removing excess heat, with the most common heat transfer fluid in desktop PCs being (distilled) water. The advantages of water cooling over air cooling include water's higher specific heat capacity and thermal conductivity.

Is liquid cooling necessary if not overclocking?

Almost certainly not. Air cooling also dumps all the heat from your CPU and GPU onto other components before it is exhausted out of your case. Water cooling lets you get it out to radiators much more directly without heating up the inside of your case.