Silverstone Tek Nightjar Series 500-Watts Fanless 80 Plus Silver Certified ATX 500 Power Supply ST50NF Fan-less thermal solution, 0 dBA acoustics 500W continuous power output Strict 3% voltage regulation Efficiency 84%~88% at 20%~100% loading PCI-E 8pin and PCI-E 6pin connector support Fan-less thermal solution, 0 dBA acoustics 500W continuous power output Strict 3% voltage regulation Efficiency 84%~88% at 20%~100% loading PCI-E 8pin and PCI-E 6pin connector support Powerful class-leading single +12V rail, support ATX 12V 2.3 & EPS 12V&lt; Aluminum construction Server-level components