Hardware Secrets have completely disassembled Silencer 610 EPS12V, a 610 W power supply without any fancy feature from PC Power & Cooling and also tested it to see if it can truly deliver 610 W. A quote from the article:

Silencer 610 EPS12V is a 610 W power supply from PC Power & Cooling using the traditional PC power supply design with a single 80-mm fan on its rear side. Besides its Spartan looks this unit features active PFC, two video card power connectors for SLI and CrossFire, EPS12V connector and is labeled at 40º C, so the manufacturer guarantees that you will truly get 610 W of power. In fact, this unit came with a testing report generated by a Chroma 8000 machine (probably the most high-end power supply load tester available today), showing that not only this unit can deliver its 610 W but it can peak up to 680 W. We completely disassembled this power supply to take an in-depth look on its design and components and also tested it by ourselves to see if it can truly deliver 610 W of power.

>> PC Power & Cooling Silencer 610 EPS12V Power Supply Review