Virtual-Hideout posted a review on the CoolerMaster Silent Pro-M 600w Power Supply

It may only be flexing 600 Watts. And, it may not look like it has anything special underneath that clean, sexy, black exterior. But, the CoolerMaster Silent Pro M 600W Power Supply does have some extra horse power hiding underneath the hood. This is why I suggested having a look at the test results before running off to buy a 700 Watt PSU. The Silent Pro M 600W is like a "sleeper" hot rod PSU hiding underneath that cool, black
exterior.

CoolerMaster Silent Pro-M 600w Power Supply Review