A detailed description of the power supply can be found at the manufacturer's website. There is also read that in addition to the 20 + 4 pin power supply should also exist the 4-pin motherboard connector 12V. Well, that's not true. The fed me sent PSU had only the 20 + 4 pin power supply (in addition to the connections for the drives). Thus it was not suitable for my motherboard. (I am also a mystery where this power supply can be used. For already the ATX 1.0 standard was the 2x2 12V connector.)