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."
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips