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TX750W fan speed always the same


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I just started using this power supply. I immediately noticed that the fan speed doesn't modulate, regardless of whether the computer is at idle or otherwise.


I turned off the two other fans - the cpu fan, and the rear exhaust fan - so I know the sound is coming from the psu.


My questions are as follows, and I know sound volume is completely subjective:


I thought the idea of using a large fan - I believe the fan on this psu is 140mm - actually reduces the fan noise, being the larger fan is more efficient. Is this true?


Also, my last power supply had an 80mm fan in the back of the psu. Do the bottom mounted fans produce a more audible sound, simply because of their placement?





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