SF Series power supplies bring legendary Corsair performance and reliability to the SFX small form factor standard. The SF Series power supplies have the features found in full-size high performance power supplies, with certification for 80 PLUS Gold efficiency, superior voltage regulation, Zero RPM mode for virtually silent operation, and...
80 Plus Bronze, and two 12V rails. Source
80 Plus Gold, fully modular, and the SFX form factor. Source