Fortron/FSP Everest 80Plus 600 (Continued)
The power supply may be completely without noise at low loads, but when it reaches the switch-on threshold, the fan is clocked at such a low speed that it makes a creaking noise. This is very disturbing in the range between 110 and 250 watts. The temperature in the power supply increases, the fan starts to rotate with a creak and cools the temperature down, it stops, and then starts up again less than two minutes later. If the user isn’t constantly working in either an extremely low performance or an extremely high performance range, he or she will soon be rather annoyed with the power supply turning the fan off and on.
Our measurements also found that fan-less operation at a full 20% load is not possible. The threshold in the Tom’s Hardware lab with an ambient temperature of about 25 °C lies at about 100 watts.
An interesting detail is the blue lit power switch: this becomes brighter when the unit is switched on than it is when in standby. If the power supply is switched off completely, it is not lit at all.