Teschke has informed me that they have written a quick review about the Engelking AP2 - 6300 SFC PSU. Here's a snip: Like in the specs described , the fan of the Engelking powersupply switches on , when the temperature reaches 49°C . Under normal windows working enviroment the fan switches on after 22 mins. With fullspeed (3D mark 2001 loop) the fan switch after 14 mins on. Head over by clicking the above shown link.