So, I finally got my power supply replaced. I just received my EVGA SuperNOVA 1200 P2 Power Supply. Been wanting this one for awhile. But it was my last hardware upgrade in this updated build. Very impressive packaging. More impressive packaging than my EVGA X99 Classified MoBo. Anyway, that aside, what does not impress me is the power supply itself. Now, I am no electrician and correct me if I am wrong, but doesn't the +12V not supposed to fluctuate but every 30 seconds or longer? This power supply is fluctuating between 12.037-12.110 and 12.184 every 5 to 15 seconds. Now comparing it to my just replaced power supply "Tagan ABS 1300w" that fluctuated between 11.870 and 12.037 every 25-35 seconds. Keep in mind these tests are both with no load. Using the E-LEET Tuning Utility X latest version 0.9.2x64
 
Now is my new SuperNOVA P2 defective or is this normal?
 
Another thing I noticed about the SuperNOVA P2, is that the Eco switch on the back has 3 settings. Eco/On/Off. The issue is that there is no clear click with the switch that differentiates the 3 settings, they all seem to squish together. I know this is not a setting you change often. But since this setting is kinda hard to reach, being behind the computer. I have to look and see or feel where the switch is located. Not a big deal, but paying over $200 for a power supply, the Eco switch should be as simple as a light switch.
 
I love EVGA products, just purchased my second motherboard, 4th Video card and now a power supply. This purchase kinda has me puzzled.
 
Anybody have any advice or ideas about these issues? Am I just over reacting? Or are these actual problems with this unit? 
 
Thank You. 

Thanks for the quick reply. I did wonder about the software and hardware communication not being perfect. I know the the small change of 150mv was very small. Just thought what was alarming, is how often it jumped up and down. 
I will get a multimeter and probe it, thanks for your quick response.

EVGATech_MDecker
The 12v rail should read between 11.4v and 12.6v (+/- 5% of the rail's rating). It should be stable, with little to no fluctuations. A slight fluctuation of up to .05v is generally fine as long as it happens no more than once every 15-20 seconds. A larger fluctuation, up to .1v can be safe as long as it happens no more than once every 1-2 minutes. A fluctuation higher than .1v, or more often than every 10 seconds could be an indication of an issue with the 12v rail.

 
Check the psu with a multimeter for best results.

You can also check the voltages in the BIOS to get a near real-time idle reading. It's far more accurate than software, but not *quite* as good as a multimeter.