With power supplies, many people believe that bigger is better but in truth most rigs will never draw above 500W including my i7 rig at full tilt. So should we be buying smaller wattage units that are not only cheaper but also generally quieter? Yes, the battle between noise and performance once again rages in the PSU market and Cooler Master's Pro M500 unit hopes to be the quietest we've tested yet. Featuring a 135mm fan, transferring heat from hot spots and fin type design, Cooler Master's unit can certainly talk the talk but can it walk the walk? Let's find out.