Enermax NAXN 500W ATX12V Power Supply, ENP500AST ErP Lot 6 (EuP) 2010 ready! - Help system to meet ErP Lot 6 2010 (&lt;1W at standby mode) with high efficiency 5Vsb circuitry. HeatGuard - Keep PSU fan running for 30-60 seconds after shutdown to dissipate the remaining system heat and prolong system lifetime. AirGuard - Air-inlet with optimal aero-dynamical design reduces noisy air turbulences. SafeGuard - Multiple protection circuitry of OVP, UVP, SCP, OPP, and SIP protect your system MULTI ready - Ready for next-gen MULTI CORE systems as INTEL Core 2 Duo/Quad/Extreme/i7/i5 and AMD Athlon 64X2, Phenom II. SILENT ready - Ultra silent 12cm fan with intelligent RPM control guarantees cool performance and silent operation. 24/7 ready - High-Quality components and dual 12V rails design enable non-stop usage with stable and reliable current.