"Even though power supplies from Seventeam aren't sold in the USA retail market, they are very popular in several other countries, due to its low cost. In fact, it seems that Seventeam is the OEM manufacturer for some other brands – we discovered that the external power supply series from XG/MGE, Magnum, is in fact Seventeam Fanless series. ST-420BKV is a 420 W power supply without PFC. Let's take an in-depth look on this power supply to check whether this unit is good or not and test it to see if it can really deliver its announced 420 W."