SilverStone ST55GF 550W + 550W PS/2 Redundant Power Supply For users with mission-critical systems or file servers, nothing is more important than a power supply with always up reliability and redundancy. With the pervious venerable Gemini ST46GF model as the starting point, SilverStone ST55GF improves every aspect of the former from specification to user impression. By combining proven industrial grade components and a focus on performance, the amazing dual 550W independent power packs stowed inside a PS/2 frame enable the possibility to enjoy the bullet-proof security of a 24/7 server in just about any case and any system!