• Welcome to Overclockers Forums! Join us to reply in threads, receive reduced ads, and to customize your site experience!

Overpressure question

Overclockers is supported by our readers. When you click a link to make a purchase, we may earn a commission. Learn More.

jdub

New Member
Joined
Mar 24, 2001
I trying to find out about how much overpressure there should
be in my case. If there is too much, does it do harm? This is
a general question as I have not started building my machine
yet.

BTW, I've been lurking here for awhile now and this seems like
a great place for info. The attitude is positive and I'm really
glad to have found it.
 

stool

Senior Member
Joined
Dec 20, 2000
Location
Albany, NY
You don't want too much overpressure, as your airflow will be impeded. A slight amount is better, so you aren't drawing too much air(and dust) through drive bays, your CD and Floppy, etc. Ideally, a 120mm intake and 80mm or 92mm exhaust fans will serve you well.
 

CoopertownBob

Registered
Joined
Mar 5, 2001
Be sure to include your power supply fan in the equation as it can pull quite a bit of air out of the case on its own. In mine, I only have one (80mm) case fan blowing in, and the PS fan is the only one blowing out. Works great in my application.
 

Fink

Member
Joined
Dec 18, 2000
I build my systems to have about 5-10% overpressure with all fans on and at 12V. But most of my fans are split to run at either 5/12V or 7/12V and I rarely run all the fans at 12V. I generaly turn on more intake fans than exaust.....
 

Fink

Member
Joined
Dec 18, 2000
I build my systems to have about 5-10% overpressure with all fans on and at 12V. But most of my fans are split to run at either 5/12V or 7/12V and I rarely run all the fans at 12V. I generaly turn on more intake fans than exaust.....