Replacing PSU fan with quieter one

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nucolos

nucolos

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Jul 5, 2013
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I just bought a seasonic m12ii evo 850w psu. And my problem is that the fan on it is very loud, specially compared to my old xfx 550w core psu.
So i'm planning to replace the fan on it. The question is which fan should i buy. I was thinking the Scythe GT 1150 rpm would be a good choice, but i read somewhere that i should get a fan with 70 CFM, but those fan spin up to 2800 rpm, So what would yo suggest?
Return it or buy a noctua fan are not an option.
 
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rubez

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If I was to change my PSU fan, seems I need a 3-pin to 2-pin adaptor to fit the 2-pin header. Is it then as simple as connecting the new fan up?

I heard the capacitors hold charge even when unplugged. How long should I leave it unplugged so it completely discharges?

Like, overnight?
 
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Moonstick2

Moonstick2

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If you've just bought it, why not just try returning it? The inside of a PSU is not the ideal place to muck around if you're not very sure of what you're doing.

It may not be as simple as replacing the fan. This guy for instance http://www.overclock.net/t/1491830/very-loud-seasonic-m12ii-evo-750w-fan-under-load-is-this-normal reduced his noise by turning the unit over. And in an old case with a side vent for an 80 mm fan I found that the volume was distinctly different according to whether it was set to exhaust or intake, due to the way the airflow reacted with the vent.

You might change the fan and have little or no improvement, or you might inadequately cool the PSU and set yourself up for a load of problems down the line.

I guess you'll pay a restocking fee for returning it, but even at e.g. 20% ultimately I doubt it'd be a lot more than the cost of a decent replacement fan.
 
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rubez

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The stock fan is cheap and loud under loud, and it makes an annoying noise when running slow (when I force the fan to stop, noise goes away)

So I want to replace it with a silent fan.

I have a 140mm Noctua case fan. Will the RPM be enough? (since it's only 2 wires, just power, no PWM signal)

Replacing the PSU gets me significant downtime, I can do this today. and the replacement will still be noisy under load even if the new one is silent at normal RPMs.
 
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nucolos

nucolos

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I Think the fan that i install on my psu is not enough because when i start playing some games it starts to spin up at max speed,but when i exit the game, the fan keeps at max speed for about 5 more minutes. The fan that i install is a 1650 rpm - 1.8 mmH2O - 65 CFM.
Big noctua fans have better airflow and static pressure, so i think you will be fine. But are you sure it can fit in there?
 
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