The Thermaltake Toughpower PF1 fan can operate under two different configurations. You firstly have the ‘standard’ mode which, as you can see in our results below, appears to operate on a three-tier speed system. The hybrid functionality effectively introduces a 4th-tier that doesn’t require the fan to operate until the PSU is at, roughly speaking, around 40% load. – The truth is, however, that while the Smart Zero Fan (hybrid) function is undoubtedly useful for those who value an ultra-quiet system, the fan is barely audible even in its standard mode. – It’s dealer’s choice, but with the hybrid mode on or off, the Thermaltake Toughpower PF1 is a quiet power supply!
It is, in fact, so quiet in its standard-setting that having the ‘hybrid’ mode on seems a little borderline pointless to me.
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