Bjorn3D posted a review on the Antec Neo HE 550 Power Supply

To own an enthusiast level system today means you have in your midst a Power Hungry Monster! Why do is say this? Well here's a perfect example of my rationale: A few days ago the best Extreme PSU Calculator that I have found to date over at Outervision eXtreme. This calculator takes everything and I do mean everything into consideration I ran my current system through it and determined that @ 100% PSU utilization I needed around a 500 Watt PSU. I then wondered at 100% utilization how much of a lifespan would my PSU have? Not to mention cooling.

Antec Neo HE 550 Power Supply Review