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Thread: Enermax Digifanless 550W Review @Tom's

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    Default Enermax Digifanless 550W Review @Tom's

    http://www.tomshardware.com/reviews/...pply,4125.html

    Hmm, i noticed some difference of opinion between Jeremy and Aris :

    Originally Posted by Oklahoma Wolf
    And... we have a problem. Enermax wants this unit installed with the grille facing up, but the screw holes here are meant to mount the unit in the traditional "I have a fan, so mount the fan grille facing down" arrangement. This means you can't install this with the grille facing up unless your case has two sets of power supply mounting screw holes. ( http://www.jonnyguru.com/modules.php...tory2&reid=425 )
    Originally Posted by Aris Mpitziopoulos
    This is a passively-cooled PSU, so you should install it with the top exhaust grille facing downward. If you don’t follow this advice, hot air will be trapped inside the PSU, leading to higher operating temperatures and, ultimately, functionality problems that will shorten the PSU’s life. ( http://www.tomshardware.com/reviews/...ly,4125-2.html )
    Which one to choose?
    Last edited by sith'ari; 05-17-2015 at 11:36 AM.
    CPU:Athlon 64 FX60 (2-cores) 2,6GHz
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    cpu cooler:ArcticFreezer13 CO
    RAM:4 GB DDR 400MHz
    GPU:Asus 750 Ti 2GB
    PSU:Seasonic Platinum 660
    Monitor:Asus VE228HR
    Tower:Coolermaster Elite 430

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    Aris made the typo.

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    Quote Originally Posted by -The_Mask- View Post
    Aris made the typo.
    But, it seems logical that the fans from cpu/gpu will throw hot air inside the PSU if the grill is looking up.
    And don't forget that Enermax states operating temperature only at 40C.
    CPU:Athlon 64 FX60 (2-cores) 2,6GHz
    Mobo:Asrock 939a785g
    cpu cooler:ArcticFreezer13 CO
    RAM:4 GB DDR 400MHz
    GPU:Asus 750 Ti 2GB
    PSU:Seasonic Platinum 660
    Monitor:Asus VE228HR
    Tower:Coolermaster Elite 430

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    Hot air goes up, so the grill needs to be up, but this means the hot air from the PSU goes into the graphics card and CPU cooler.

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    Quote Originally Posted by -The_Mask- View Post
    Hot air goes up
    ...if there isn't any significant airflow in the case: besides, convection transfer may rather easily be influenced by the side and rear grilles.

    It would be nice if Jeremy and/or Aris would perform a (supplemental) temperature test in both the orientation (a FLIR test would be also nice).
    Best, Luca

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    Grill down and heat rises into the PSU's main PCB.

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    Quote Originally Posted by jonnyGURU View Post
    Grill down and heat rises into the PSU's main PCB.
    Oversimplification, Jon.
    Best, Luca

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    Somebody call Mythbusters
    Careful what you wish for... You just might get it.

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    I have it right as Wolf does. I even mention the writing on the PSU itself when you first unpack the unit:
    Note the ribbon over the unit notifying the owner that the unit must be installed on the bottom of a case with the mesh side facing up.
    http://www.hardwareinsights.com/wp/e...nd-accessories

    +12V MOSFETs Unknown number of MOSFETs
    I know, I know http://www.hardwareinsights.com/wp/e...Secondary-side

    And I even know the cable thickness under the sleeving!!

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    Quote Originally Posted by quest for silence View Post
    ...if there isn't any significant airflow in the case: besides, convection transfer may rather easily be influenced by the side and rear grilles.

    It would be nice if Jeremy and/or Aris would perform a (supplemental) temperature test in both the orientation (a FLIR test would be also nice).
    Any top or rear exhaust fans from the case are going to pull air through the PSU if the grill is facing upwards if the case has negative pressure.

    If the case has positive pressure, the hot air will be pushed out the back of the unit due to air looking for the easiest path to travel.

    A simple way to test this (if you have a spare case and some high powered fans) is take a dead (or simply turned off) PSU and hook up some front powered fans to a case and have them pump air in. You will be able to feel some air coming out the back of the PSU even with the fan off and everything in the way (if the fans are powerful enough obviously.)
    Like wise, if you take those fans and put them up top you can feel air being sucked into the case with any open ventilation areas.

    Again, the amount of air coming through the unit is all dependent on the power (airflow generated by) the fans in the case. More powerful fans, more airflow moving through the unit. Air, much like water, always takes the path of least resistance. With a pair of high speed server fans (Panaflo, Sanyo Denki, Delta, etc) it'll be more evident than with a pair of quiet fans (Be Quiet, Noctua, Enermax, etc).

    The question will always become how much air is moving through that unit and how much does it matter?

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