The Cooler Master Real Power Pro 850W power supply is a great looking piece of hardware that your computer setup will love, as long as you do not mind the extra wires piled up in your case. The Real Power Pro did exactly what it was supposed to do - deliver power to my computer and keeping all of the rails very stable and close to their stated ratings. There was little fluctuation in the voltages between the idle and load testing. Watching the voltages while running through 3Dmark06, it seemed to handle the load, to no load and back to load changes with little change in the voltages measured. The only complaint that I have, is the way that Cooler Master designed this power supply - they should have made it with a modular design, to keep the amount of wires hanging around the inside of the computer to a minimum.