1000W Real Power Pro Psu World's first six +12V rails for better power distribution in Quad-SLI and 2 ways server system Four 6 pin PCI-e connectors offer great future upgradeability Two 8 pin PCI-e connectors are compatible with future graphic card upgradeability Compliance with the newest Intel standard ATX 12V V 2.2 Compliance with the newest SSI standard EPS 12V V2.91