W A R N I N G !

W A R N I N G !

This page is full of non-facts and bullsh!t, (just like the internet and especially forums and other blogs), please do not believe entirely without exercising your intellect. Any resemblance to real things in reality is purely coincidental. You are free to interpret/misinterpret the content however you like, most likely for entertainment, but in no case is the text written on this blog the absolute truth. The blog owner and Blogger are not responsible for any misunderstanding of ASCII characters as facts. *cough* As I was saying, you are free to interpret however you like. *cough*

Thursday, April 1, 2010

Computer myth: Having a bigger/better CPU/GPU heatsink makes the rest of the system hotter

It is not true, and I shall provide the explanation - physics style.

There is a myth that a bigger heatsink dumps heat faster to the surrounding hence heats the surrounding up.

While that is true if talking about lower thermal resistance...

But understand where the heat is coming from.

All of the heat energy is coming from the graphics card.

And all this heat energy will have to be dissipated to the surrounding. Regardless of the size of the heatsink

i.e. rate of heat transfer is constant (to be precise, when the graphics card temperature stabilizes)

A smaller heatsink just means a higher temperature before this amount of heat transfer takes place - since rate of heat transfer is dependent on temperature difference between the two.

To illustrate, an example -

A 50W gfx card, a 1°C/W lousy heatsink, and a 0.5°C/W decent heatsink (in comparison, good CPU coolers are 0.25°C/W and lower), with air temperature at 30°C constant.

The same 50W gfx card will reach 50W x 1°C/W + 30°C = 80°C on the lousy heatsink, and 50W x 1°C/W + 30°C = 55°C on the decent heatsink.

But both will dump 50W of heat into the surrounding. Just at different temperatures.

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