Posted 28 January 2007 - 01:05 AM
Fans are a bit dicey - too few and you can easily overheat, too many and you can disturb the airflow enough to overheat. But, if you've got too many you can always shut some off - if you don't have enough, then you'll end up having to get more.
A good fan concept (IMO) is to balance the inflow with the outflow. If you must err, err on a little bit more going in than going out (overpressure) - but not a whole lot.
The ATX specification generally calls for cool air to come in the front bottom of the case and exit through the PSU. But, by the time it exits, it's picked up heat from all the components - so you can improve upon that with a bit of thought.
For example, you can duct cooler outside air directly onto the CPU - this'll benefit the CPU. Then, you can put a blowhole in the top of the case to exhaust the extra airflow that you added for the CPU. This'll balance it a bit - but it's a bit simplistic since you've still gotta consider how the air flows through the case.
Checking the temps of your components is the best way to see this - that way you can see how well your changes cool your system. Tools like SpeedFan can help, but by far the best thing is an infrared temperature sensor that you can point at the components to take their temperature.
After that it's just a matter of experimentation! Good luck!
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