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Is my airflow correct? - Page 2

post #11 of 13
A couple things that people don't know or don't account for:

1. No need to feed fresh air to your drives or PSU--they do not require much cooling (if any). Though a cool drive is safer and may live longer, it only requires minimum air movement.

2. Unless you have literally mapped out all the airflow in your case using yarn/smoke/whatever, and it's perfect, positive pressure is generally a bad thing if you want the most efficient airflow.
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post #12 of 13
Quote:
Originally Posted by samwiches View Post

A couple things that people don't know or don't account for:
1. No need to feed fresh air to your drives or PSU--they do not require much cooling (if any). Though a cool drive is safer and may live longer, it only requires minimum air movement.
2. Unless you have literally mapped out all the airflow in your case using yarn/smoke/whatever, and it's perfect, positive pressure is generally a bad thing if you want the most efficient airflow.

I respectfully disagree with you that "positive pressure is generally a bad thing".

I don't know where you came up with this idea, but it is not true. Positive pressure in fact is desirable to keep dust out of the case. Both negative and positive pressure PC case situations can deliver good airflow and cooling if done properly. The advantage to positive pressure over negative is in the elimination of dust being sucked in at every opening in the case.

The only objective means to tell what works best for any application is by carefully testing and checking temps. I laugh at all the threads with arguing over positive vs. negative pressure when air FLOW is what matters, not air pressure. You can have excellent flow with either and that's what you want FLOW.
post #13 of 13
AMD4ME, I got the idea from physics. Low pressure air is higher flowing air, and exhaust-only setups are the only way to avoid obstructed or conflicting pathways unless (or until) you can map out a perfect/balanced setup, like I said.

Strong, exhaust-heavy setups are the closest thing to open-case cooling and are the way to go if max efficiency is what you have in mind. One of your favorite links shows that, doesn't it? biggrin.gif

Actually, I bet Ehume has the best possible setup, with all those front intake fans and the fully open rear, but I doubt most people have hacked up their case to that extent.

(Plus I have no trouble with dust in my case and my place is not particularly clean. I'm surprised that people really have to consider dust as an issue.)
Edited by samwiches - 3/23/12 at 2:08pm
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