Cooling fan behind motherboard?



Joined: 05/03/2008
Posts: 9

The fan on the back of the motherboard won't help cool the CPU, which is why you won't see any difference in CPU temperature. It was made to cool the motherboard itself rather, because when the CPU starts heating up, the back of the motherboard (the area behind the socket) can get pretty hot. On a thermal camera this can be seen very clearly, temperatures of 60C, 70C, and even 80C can be measured with a laser thermometer, which is why a fan would really help keep the motherboard cool. That high temperature travels through the PCB because the circuit is made of copper, and as we all know, copper transfers heat nicely. However, these effects are minimal with any CPU running at stock frequency. When you push your CPU to extreme frequencies, then the heat "problem" occurs. With a fan blowing behind the socket this can be minimized, expect temps around 45C on the back of the motherboard, or less. With a heatsink and a fan, you can expect temperatures of around 30C and below. What happens if you don't cool the back of the motherboard? Nothing really, like Rodney said, when pushing the CPU hard, every bit of stability is welcomed. By cooling the back of the motherboard you get a more stable system in some minimal ways and you prolong system life. If you overclock up to 4GHz for example, don't worry about it, if you are pushing it past 5GHz then you already know what you are doing, and you're using some kind of extreme cooling probably.

If someone says "O RLY? Then why don't they cool the back of the motherboard when they are using LN2 (liquid nitrogen)?" Well, because LN2 is so cold, that the copper circuit on the PCB is getting colder rather than hotter. I have no temperature data however.

Hope this helps. Nice vid Rodney.

EDIT: And also what "cal920c" said.

Joined: 05/04/2010
Posts: 23

Actually Rodney, it is supposed to help cool the power delivery components on the back of the new motherboards cause they couldn't fir it on the front (for example, on the back of most of the high end X79 boards cause there was no room on top.)


Hi Rodney Sir :)
Thanx for making such a nice and helpful video reviews.
I want to ask you something regarding powersupplies.
Currently i am having a local branded power supply name ATEK, its a local brand so i am not able to find any thing about it on any website. It is a 600 watt power supply having one PCI EX 6pin power connector.
Well i am running 9600GT SONIC EDITION, system specs are INTEL CORE2 DUO E7400 @2.8 GHZ. 4 GB DDR2 RAM, 500 GB HD.

So the question is how to check that my PSU is really a 600 WATT power supply, Cause i want to upgrade to new Graphic card. and some of them requires a 600 watts psu. So i am just a bit afraid that if i mine psu is not supported so i might burn a new gpu :( which would be really terrible.

Make a Q&A video to explain us how to check the PSU watts with any kind of softwares or stress test etc etc. You know better :)
Thanx in advance SIR