Seasonic G Series V2 550 W @ techPowerUp
 

Seasonic decided to silently update their G-550 model to add Haswell support. The company did not change the model number, but did add a Haswell-ready badge to the box. The G-550 is an affordable product for users on a tight budget who, want a reliable PSU with great performance for a mid-level system.

http://www.techpowerup.com/reviews/Seasonic/G550_V2/