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To place cooling fans or not to place cooling fans.....
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Bluedeath:
My PC cpu (65w Athlon x2 4200) keeps an average cpu of 40~45 celsius degrees even in the most stressful situation (the psu fan makes more noise than the cpu one that gives only a very light whisper), im'm plannig to install 2 12cm "silent" fans behind the upper back vents just to be sure, is not the cpu heat that scare me is the reliability of the hard drive.
I'm not usiing a case but rather i'm mounting the motherboard on the PCB bracket of the cab.   
divemaster127:
I have 2 vents cut in the top & then used some of the happ arcade fans they are huge & made out of diecast metal for exhaust fans.  The downside is they are noisy
dm
Bluedeath:
Do you guys thinks that is possible do remove the fan from an atx PSU if i remove  it form the case, is going to be mounted into the cab anyway so there shoud not be any safety issues on having the psu opened.
M.Lanza:
There's a reason that the power supply has the fan, so you should probably leave it alone.

FrizzleFried:
Arcade Machine = what you are building

Arcade = a location with many arcade machines

Sorry...pet peeve...

Anyway... do yourself a favor and add a single exhaust fan toward the top OR if there is venting in place at the top add an intake fan at the bottom.  Simply add a grill if you're worried about the cats.

I can assure you that cabinet gets hot...when I open my CP after my MAME rig has been running for a while I can feel the heat that comes out from the CP and that is with a fan running.

EDIT: BTW,  you plan on adding a couple fans to your PC case that is going to be sitting INSIDE your cabinet?   :dizzy:

Seems sort of counter productive.  Why blow hot air from inside the cabinet in to an enclosed case?  Take those fans,  mount them to the cabinet door or one as an intake through the cabinet door blowing toward the PC and one as an exhaust at the top of the cab...then take the sides off the PC case.  All you need the case for is the mounting locations for the PCB, HD, etc....no need to have the sides on...

PERSONALLY,  I prefer mounting my computers for mame rigs to a piece of plywood that gets mounted to the side or bottom of the cab....it makes for real easy removal and provides maximum airflow.

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