CPU Cooling Liquid/Water vs Air

EagleDesignInc

Reputable
Feb 4, 2015
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Is that a rule or a guide to tell when does a CPU require a Water/Liquid Cooling?
Is it measured from the Wattage, Cores, types or etc...

Is there a simple rule of thumb when to go from air to liquid cooling?
Also, how to tell between a small radiator, double 120mm or even the larger 140mm?

Recently I've build an AMD FX-4350 4.0GHz and I use it a Corsair H100i 240mm (dual 120mm fans) and the system is running in very low temperatures, but I was wondering if I didn't exaggerated on the cooling....

Thank you in advance for the input in this matter.