Phantom 500 Watt power supply with Antec's new Hybrid Fan technology, provides awesome power while continuing to offer the user an extremely quiet computing environment. Phantom 500 operates completely silently until its internal temperature reaches a user selected temperature, whereupon the fan turns on to balance high power performance with quiet computing. ATX12V v2.0 compliance and ultra-high-efficiency design (up to 85%) allows Phantom to generate up to 70% less heat and consume 25% less power than standard PSU's saving you money on your electric bill.