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Fanless PSUs viable?

post #1 of 5
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I like silence and power efficiency, so I thought a fanless PSU would do me great, but are they really useful to have in a high-end desktop? My GPU is not water cooled, so it's going to get a bit loud when I play games no matter what. One less fan is always better, but it would probably reach the point of diminishing returns. I'm mostly worried about silence and low power usage only when it's idle anyway.
post #2 of 5
You can get semi-silent designs. My Super Flower Leadex Platinum only turns on the fan when it reaches a certain temperature so at low load it is 100% silent but if under heavy load it can still adequately cool itself. Some EVGA and corsair units also have this feature.
    
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post #3 of 5
The PSU is rarely the loudest part in the system. A lot of decent units have fans that stay quiet, even under a lot of stress. Typically the CPU/GPU fan will be much louder than the PSU fan at all times, so you would need to silence those first.
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post #4 of 5
Fanless PSU´s are not magical the heat has to go somewhere and that somewhere is stright into your case, so if you dont have a case with very good air flow all a fanless PSU is going to do is heat up the rest of the system.

Most PSU´s these days have a semi fanless mode where the fan will turn on at x load or x temp.

A fanless unit is good for a system that wont be loaded much or have a very low power draw but they dont really belong in a high end gaming/overclocking system.
Everything in such a system i going to be way louder anyway making the whole thing rather pointless
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post #5 of 5
fanless PSUs depends on how much positive/negative air pressure you have inside your case, the more imbalanced your intake-exhaust ratio becomes, the better fanless PSUs can dissipate heat.

fanless PSUs will overheat under little to no airflow, or even if it doesn't overheat it'd be operating at elevated temperatures.
it is much better to get a trusted PSU and swap the fan (mod) with a very quiet fan, or otherwise a PSU with 0rpm fan feature.


on a side note, all my fans are operating at either 7v, or its already has a low RPM (<1500rpm) at 12v.
the most nosiest component in my case is either the GPU under full load, or the 5400RPM harddrives.
if both GPUs and harddrives are idle, even if i press my ear directly on the case, i'd be barely hearing humming sounds.
Edited by epic1337 - 10/13/15 at 12:58am
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