OCIA.net has posted their review of the PC Power & Cooling Silencer 500w Power Supply.

Most people wouldn't expect a quad-core rig with Crossfire graphics cards to run well on 500W, but the Silencer is a testament to the fact that it can with a high quality power supply. Theoretically, at full load, this rig pulls about 400W, but very few power supplies rated below 600W could handle it. Indeed, on the topic of performance, the Silencer did a fine job, though I would have liked to see a slightly more accurate reading on the 5V line.

PC Power & Cooling Silencer 500w Power Supply Review