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Case Fan Replacement

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  • Cases
  • Fan
  • Components
Last response: in Components
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July 27, 2014 4:13:28 PM

Hi, Im going to be replacing my stock case fan with a new and more powerful fan and i was considering mounting it in such a way that it would create a negative pressure zone in order to maximize airflow. This is because I have a dell Inspiron 660 that only has one fan port to intake air, and has air vent openings on the bottom front and on the side panel. Would a negative pressure zone inside my case be a good idea or should i consider something else?

More about : case fan replacement

July 27, 2014 4:39:57 PM

Make more holes in your case. Negative atmospheric pressure will only place more stress on your fans. I have a 80mm metal holesaw. I just cut more holes.
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July 27, 2014 4:48:32 PM

Hi -
I'm not a fan of negative pressure because it can over-power smaller fan units. Specifically, at one point I found that cranking up all of my case fans to max cause *reverse* airflow through my video card and PSU. I can't believe that was a good thing. I added another supply fan to my case and reduced the speed of the exhaust fans. My experience (and thus my superstition) is that I always want more total supply than exhaust.

As a side comment, this is an example of why I build my own now. Buying stock PCs just doesn't let me extend and upgrade the way I want.

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July 27, 2014 5:28:25 PM

Take the cover off the side and take it outside and shoot about 15 holes in it with a handgun and you will have enough flow. You can use an axe to make the holes but a gun makes a nicer cleaner hole. Just sayin
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July 27, 2014 6:02:37 PM

GorfTheFrog said:
Hi -
I'm not a fan of negative pressure because it can over-power smaller fan units. Specifically, at one point I found that cranking up all of my case fans to max cause *reverse* airflow through my video card and PSU. I can't believe that was a good thing. I added another supply fan to my case and reduced the speed of the exhaust fans. My experience (and thus my superstition) is that I always want more total supply than exhaust.

As a side comment, this is an example of why I build my own now. Buying stock PCs just doesn't let me extend and upgrade the way I want.

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To be honest this is just a computer im upgrading because i dont really have the funds to build an absolutely new one from scratch at the moment. I upgraded the power source and the graphics card and they both have exhaust fans. BTW its a Corsair cx430 psu and an asus Gtx 750ti and i read that if you have negative airflow its more beneficial for rigs that have more parts with their own fans.
http://www.extremetech.com/computing/128313-extremetech... Check page 2
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July 27, 2014 6:48:26 PM

Trying to run negative pressure will get you into all kinds of trouble. Trust us! Puts more stress on fans, can cause low air flow on individual internal components. Can even cause cpu or gpu overheating. Do yourself a favor don't play with negative pressure. You will have to know the flow and pressure characteristics of each fan and balance the whole system. WAAAAY too much work and risk. Just let enough air in so you don't end up with negative pressure. And like I said if the case doesn't have enough holes you can blast some holes in with a gun (make sure it's just the covers and do it outside and for heavens sake watch where you are shooting. You wouldn't want stray bullets flying around)
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