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Using a dedicated measurement instrument such as a Chroma or a SunMoon for power supply testing is without doubt the most ideal and accurate way (not to mention the fastest) to do that currently. However it's certainly not the only way there is and so pretty much anyone can test a power supply just by using his own computer. Certainly limitations do apply and so you can't really test a 1000W power supply if your system only uses 500W at extreme loads and that's why during the past 5 years i have saved certain hardware components for the purpose of building a PSU test rig. True it may not be as accurate as the above mentioned solutions but it comes really close and is in fact closer to real. So as always we ran several games with maximum graphic options enabled at a resolution of 2560x1600 in order to stress every hardware component and increase the overall power demands of the system. The Passmark BurnIn Test was also used to overstress the components in an effort to provide the most accurate results possible. As a final test we also used the latest OCCT 4.0 software and its dedicated PSU testing suite since it can really bring a power supply to its knees after even just a few minutes.
Rail stability was checked/measured with the CPUID Hardware monitor and a Metex multimeter which also recorded the system load in idle and in load. As always try to remember that the power consumption numbers listed in the graph are the highest (Peak) ones recorded during the entire duration of the tests and not the average (Idle) ones. Noise levels coming from the fan were recorded using the high precision HD600 ExTech Sound dBA Meter from the rear of the unit and at a range of no more than 5cm. Readings under load are recorded the exact moment we manually switch all graphics cards from full speed to idle, that way the fan of the power supply does not have enough time to slow its RPM and so by doing this we get very accurate noise level readings. Needless to say in order to get 100% accurate readings you need to have a noise isolated room for that exact purpose, something which is quite impossible unless you are working inside a real lab (some people use very small noise insulated boxes but due to their size both heat and noise exceed normal levels and so the results can't really be considered 100% accurate). Also do take into account that since all noise measurements take place from just 5-10cm away the final noise levels to reach your ears will be far less.