Not possessing the very expensive elaborate PSU testing equipment owned by some, my testing was less extensive and much less complicated. First, I wanted to see if the Frequency Conversion really works. I felt that using a Kill A Watt meter, comparing the wall outlet wattage between the EX-1200 and another PSU could show whether or not the EX-1200 actually is using less energy at idle. The comparison PSU, an OCZ EliteXStream 800 watter, is also 80Plus certified, and should be using less energy than the EX-1200 at idle.
Of course, wattage used bounces around a lot due to various things going on in the system, even at idle. I used the meter's averaging capabilities to get a more accurate measurement, I ran the tests for one hour each with the rig at idle.
Yeah, I know, my little 20 buck Kill A Watt meter isn't the greatest PSU testing equipment, but the 1200 watt PSU power supply should have been drawing at least as much wall outlet wattage as the 800 watt, actually more considering the 800 watter was running at nearly 25% load, and the 1200 watter, if running as if it were a 1200 watt PSU, was running at less than 13%.
Obviously the Frequency Conversion technology works. Of course any energy savings mean something, helping the environment and your wallet. But more important to me, this huge PSU is running efficiently at a ridiculously low load, making the rig's components last longer, the overclock more stable, and all the other benefits gained from your rig receiving clean power.
Next I tested voltage drop under load. I prefer to use the benchmark software OCCT. A cool thing about OCCT is that it makes charts of the findings of various sensors during the testing. Unfortunately, OCCT seems not to like 64-bit Vista as the +12v is never correct. So I ran the power supply test, which maxes out both the CPU and GPU, and watched a multimeter during the entire test.
At idle, the multimeter read a constant 11.97v, well within the industry standard.
Watching my trusty multimeter during the testing, the +12v spent about 99.9% of its time at 11.95v, with the occasional dip to 11.94. It never dipped lower than 11.94v, and it occasionally jumped back up to 11.97.