Is PSU fan speed controlled by temperature only?
In most reviews, I saw a picture showing the relationship between power load (in Watt) and fan speed or SPL (http://xbitlabs.com/articles/coolers/display/antec-psu-roundup_5.html). It looks like the fan is adjusted according to power load. The higher load, it runs faster. From some SPCR’s review articles (though they also prefer to provide a table between SPL and DC load), I heard that fan speed is controlled by temperature (absolute value, or delta value between Intake and output?). Therefore, it runs faster in summer than in winter, lower noise can be achieved by lowering intake air temperature (e.g. using Antec P18X series). Is this true? If so, if I find my PSU is not quiet as expected, maybe I shouldn’t replace it with a quieter PSU immediately, but try to improve my case’s air flow first. I saw the low SPL is generally achieved in very low temperature (21 ~ 30 Celsius, http://www.silentpcreview.com/article684-page4.html), but I don’t have such confidence for my closed case in sum
