The FPS Review checked out the Seasonic FOCUS GM-650 650W Power Supply
A quote from the article:
Seasonic FOCUS GM-650 Seasonic is one of the older companies producing consumer power supplies having been founded in 1975 and entering the PC power supply production market in 1980. Seasonic is the OEM and ODM of this unit.Seasonic FOCUS GM-650 650W Power Supply Review