. The CX550 power supply provides modern power supply technologies & 80 PLUS Bronze efficiency at a competitive price point. The CX550 offers many upgrades from traditional designs. It is black with black cable sleeving & black connectors offers a large diameter thermally controlled 120mm fan & is nearly silent when running at idle. The LLC resonant topology with DC to DC ensures best in class voltage regulation enhanced efficiency at lower loads & complete compatibility with all modern day PCs..