Thermaltake Lite Power 550W ATX PS-LTP-0550NNCNUS-F Incorporating various high-quality components, the new Litepower max output 550W  saves energy up to 80% efficiency. Litepower Series adopts 120mm cooling fan delivers excellent airflow at an exceptionally low noise level. Extra-long EPS/ATX 12V 4+4pin CPU cable (550mm) guarantees sufficient lengths of cables to the build, especially full-tower chassis. High quality components enable non-stop usage with stable and reliable performance, no more capacitor explosion and leakage Sleeved 24pin cable makes cable management easier, reducing clutter and increasing airflow inside the chassis.