... -coreAuthentication: High energy efficiency, complies with Energy Stars and 80 PLUS *High efficiency more than 80%, available from 300W to 600W ... X.*High energy efficiency, complies with Energy Stars and 80 PLUS,TYPICAL EFFICIENCY (50% Load): 84.2%.*2 ounce copper PCB ... priority,twice material,twice efficiency)*professional 6-pin PCI-E connectors for hi-end graphic cards,Supports SLI and Cross Fire ...