Limit 1 per customer. The SilverStone SX550 is a standard sized SFX model with high performance at a surprisingly affordable price. It has an 80 PLUS Gold level of efficiency, 50 degrees Celsius temperature rating, and reliability of a continuous 550W output for 24/7 operation. Furthermore, the SX550 has a flexible single +12V rail with 45A to support dual 8pin/6pin PCI-E connectors for multi-GPU systems. Equipped with automatic temperature control, its 80mm fan can remain silent during idle and provide adequate cooling during high loading conditions. For SFF enthusiasts looking for the best bang for their buck, the SX550 is an excellent choice.