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Thread: Does power supply orientation really matter?

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    Default Does power supply orientation really matter?

    So basically I bought a Corsair Ax860i about a month ago and its been working flawlessly, no clicking sounds from the fans, no unusual fan ramping up and down even though in link I do see that the fan seems to go to 500 rpm every few seconds, not sure if that is gonna wear it out or not. But no clicking so far. as to my question. Does the orientation of my PSU really matter. At the moment I have it with the fan facing down. I have read that this makes the heat travel up into the PCB and goes again natural cooling when the fan is off. I monitored the temps on the unit when I was gaming for a few hours and at most it got about 38.5-39c over a few hour period. I have one of those MSI r290 gaming 4g video cards that is non reference and it seems to put quite a bit of heat into the case. see attached pic



    So with this setup and alot of air being dumped into the case, would it be best to leave as is (fan facing down) or put it right side up with potentially very warm air being pulled into it and counterbalancing the natural process of heat rising off the pcb? I could see in a computer with a reference graphics card flipping it helping, but I'm confused on this and honestly don't want to move wires around if I don't need to just to experiment.

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    I think in this case it could be better to mount it with fan facing upwards, since the fan is going to kick in very rarely (if ever).
    But if you leave it as it is it'll be fine too.
    Xeon X3440 @3,1GHz + GTX660 + 2x4GB @1650MHz CL9 + Corsair RM650

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    Quote Originally Posted by yojo2 View Post
    I think in this case it could be better to mount it with fan facing upwards, since the fan is going to kick in very rarely (if ever).
    But if you leave it as it is it'll be fine too.
    +1
    Best, Luca

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    but does the fan kick in based on % of power drawn or temps...If temps then it shouldn't matter except for the fan wearing out faster (in which I've seen it doesn't even seem to really come on or stay on at full load with my system). Either way if the fan works as a tradional fan does when controlled by a fan control, e.g. ramps up with temps, then either way it should never overheat...only question is how much do you want the fan running, which seems to be almost nil atm with it facing down. I may just flip it when I have time to burn just to see what happens....

    Actually I thought of something....If the case is currently set up with negative fan pressure, then having it flipped could potential (although most likely insignificantly) make the PSU a source of additional warm air coming into the case until the fan kicks in and reverses the airflow going thru the PSU.

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    your case allows cool(ambient) air to flow by convection, or by fan when needed for your PSU.

    This is optimal.

    The other way, you will always be pulling heated air from the case...both needlessly heating your PSU, and actually making your case cooling less efficient. (better to have the air unrestricted exit through the back, than trying to vacuum down and also back at same time)

    There is no advantage to switching.

    You could use taller feet if you want to improve air flow into the psu.

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    Quote Originally Posted by yojo2 View Post
    I think in this case it could be better to mount it with fan facing upwards, since the fan is going to kick in very rarely (if ever).
    But if you leave it as it is it'll be fine too.
    So what your actually are saying is, that this PSU has a design flaw and it's better to mount it upside down?

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    Not really, I'm just saying it depends on the situation

    As a matter of fact I've mounted my RM650 "upside down", because I'm convinced the fan is never going to kick in, so this just made more sense to me.
    Xeon X3440 @3,1GHz + GTX660 + 2x4GB @1650MHz CL9 + Corsair RM650

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    Quote Originally Posted by Veloz View Post
    ...no clicking sounds from the fans... But no clicking so far.
    Why would the fan make clicking noises?

    Quote Originally Posted by Veloz View Post
    but does the fan kick in based on % of power drawn or temps...
    Both.

    I personally would run the PSU fan up. I've just found that fan down the PSU that heat rises into the PCB. If it's mounted fan up, you still don't have to worry so much about the hot air in the case because the fan shouldn't spin to suck that air into the PSU very often and the PSU's PCB is actually farther from that heat source.

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    Talking

    Quote Originally Posted by jonnyGURU View Post
    Why would the fan make clicking noises?
    Corsair branded!!!!11

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    I personally have a semi-fanless power supply, and I have it mounted with the fan up. I have my case laid out to create slight positive pressure, and I have yet to see the PSU fan come on (when in fanless mode, anyway. I usually run it in full-fanned mode).

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