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Thread: PSU Mounting - Fan up/in or down/out?

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    Default PSU Mounting - Fan up/in or down/out?

    For bottom mounted PSU's, it's obvious that to keep the logo upright the fan is on "top" and blows into the case. Almost all manufacturers have the logo upright with the fan on top.

    But some cases have vented bottoms which makes me think to mount the PSU "upside-down" with the fan blowing down and out. This makes the logo and text upside down.

    What's the deal?

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    Well, I'd say that developing a logo that reads the same normal and upside down is just a low priority.

    ps

    with the fan blowing down and out.
    in nearly all cases, the fan is blowing into the psu, and exhausting out the back...no matter which way you choose to mount.

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    Yes, but what do you say about the PSU breathing warmer air from inside the case or cooler air from under case (whether it effects performance or not is moot for this discussion)?

    That's my question concerning which way to mount the PSU - which way should the fan face? Logic says go with the logo - keep it upright and intake warmer air from inside. This may also assist with exhaust.

    But, drawing air downward in your case may pull warm air back down to your GPU.

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    Thank you! Then why would manufacturers place the fan on "top" with the logo upright? This is causing lots of people to install PSU upside down with fan intaking air from inside the case. So, really the logo must be upside down to face the fan down.

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    I personally install them fan up with fanless mode off, so that they can help with exhausting hot air from the video card area.

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    Wouldn't that also cause it to slightly pull warm air back down to the graphics card? Since hot air wants to rise.

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    Quote Originally Posted by LB3 View Post
    Since hot air wants to rise.
    Set aside any temperature gradient with reference to height, what you say just happens when there isn't any "active" airflow around: when there is one (like the one generated in an enclosure by the PSU/GPU/CPU/case fans), your mileage may vary.
    Best, Luca

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    Quote Originally Posted by LB3 View Post
    ... So, really the logo must be upside down to face the fan down.
    Yep:



    If logo orientation is mission critical and alpha priority you can always flip the case on its head to read it correctly .

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    Quote Originally Posted by LB3 View Post
    For bottom mounted PSU's, it's obvious that to keep the logo upright the fan is on "top" and blows into the case. Almost all manufacturers have the logo upright with the fan on top.
    That's not true. Most PSUs have the label on each side facing different directions. So as long as the "open side" of the case is on the left (as the user is looking at the front of the PC), the label is always upright whether the PSU is installed fan up or fan down.





    You using a PSU made before a time when cases allowed for bottom PSU mounting?

    Also, you said the fan "blows into the case". That is wrong. All PSUs have INTAKE fans. The air blows out the back.
    Last edited by Jon Gerow; 09-26-2015 at 01:30 AM.

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