Subject: Additional fans
By: DerfX (IP: 70.121.162.*)
Written on: 16-06-2008 12:56

Hi Folks! What a \"cool\" forum, (pun intended)

I have yet to read through all of the entries here and maybe my question is answered elsewhere but_ I have a question that many folks might find interesting. I built this computer several years ago but since I used a really fast Prescott P4 with HT and lots of ram, it\'s hardly worth replacing just yet. But, I have been battling heat issues with it since the beginning.

I have it running great, even under heavy load, but my temps generally run higher than a lot of people list their temps at. I idle in the low to mid forties, run in the mid fifties under moderate load, and under heavy demand, run all the way up to the high sixties. My machine is air cooled with several fans, most on controllers, and one special fan to add cool air directly to the CPU in addition to the one mounted right on the CPU heat-sink.

I found that you can learn a heck of a lot about your computer cooling solutions by burning a stick if incense and moving it all around your computer to see where air gets sucked in and where air blows out. So, my question is this_ when you add additional fans, and you follow convention and have them blowing “in” when they are mounted in the lower front and blowing “out” when they are mounted in the upper back, it’s hardly likely that you will ever get such a perfect balance of fans that you “push” and “pull” that exact same amount of air all the time. So which is better? Which way should you bias it? With a little more pushing in so there is a slightly greater pressure in the case and air seeps “out” of little cracks and plug holes or where your fans are such that they create a slight vacuum inside the case and air tends to get drawn in al the little orifices?

I never saw this concept being addressed in all the forums I have read so I thought it could be a good issue for discussion here.

By: Ray (IP: 86.142.12.*)
Written on: 24-06-2008 00:45

I saw a review somewhere where all the various combinations were tried (even a 12-fan setup!!!).
The conclusion seemed to be a little surprising ... the simplest setup was the best by far i.e., just adding one rear or top-mounted fan to the existing case which had only a PSU fan initially.
I have one 80mm inlet (low fron) & two smart 90mm exhaust (rear) fans plus an 80mm PSU exhaust fan, adjusted to minimum RPMs.
The front of my PC case has been \"opened up\" to permit filtered air to easily go straight to the front fan and anywhere else it needs if & when the smart exhaust fans kick in ... which they never have!
One final point - _fresh_ air is good! If things get toasty, open a window! Chances are the outside air temperature is much cooler than the air inside your PC.

HTH, Ray
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