When buying a power supply, the efficiency of the unit is an increasingly prominent factor due to the threats of global warming etc, it's therefore important for us to do our part in helping to save the planet. One way we can simply help is by purchasing an '80 Plus' PSU. What is an '80 Plus' power supply though you wonder? A unit certified as this is 80% or greater efficient at 20%, 50% and 100% of rated load with a true power factor of 0.9 or greater. Cooler Master has stepped up the game though. Instead of being just the bare minimum to classify as 80 Plus (80%), the UCP 900W however is rated at 88% more efficient making it seem very promising. Let's take a closer look.