If that 'certain temperature' is just above the steady-state temperature of the semi-fanless mode load (presumably 20% load), then that's pretty close to the optimum behaviour for PSU cooling, leaving just a narrow temperature/load band where on/off switching could occur. Good job!Sorry I forgot to elaborate again that SX700-LPT will also have temperature safety mechanism so that the fan will continue to spin even if the load drops below 20% while PSU internal is above a certain temperature. I guess in some ways, this combination of load based control plus temp sensing will make SX700-LPT a "semi-hysteresis" PSU?