Hi, EVGA SuperNova 750W G3 arrived yesterday and since I am still waiting for some other components to arrive, I though I should test it with a Power Supply Tester that I had. There are 2 things that trouble me though:
 
1) The PG (Power Good Signal), is 150 ms, close to the lower limit of 100 ms. The tester blinks the PG sign and beeps. Although it is within the spec limits (100-500 ms), I would like to ask if this is considered a normal PG value for a G3 PSU.
 
2) When I switch the PSU off by pressing the power-off button in the back, I noticed something weird. As expected the power is cutoff and the screen of the tester turns off as well, as it should be.
Then after about 0.5~1 second, I hear something like a relay-switch sound and momentary the tester screen lits again, then turn off again. Same happens to the PSU Fan as well, spins for a moment then goes off. After about 0.5~1 second, again same relay-switch sound, tester screen on, PSU Fan spins, then tester screen off, PSU Fan off, for good this time. Is this kind of behavior considerered as normal? Isn't there any risk for the motherboard? Note that, this behavior happens with the EVGA supplied jumper-tester also (in this scenario, the Fan turns on and off for a couple of times before complete shut-off).
 
The product package was sealed when arrived, so maybe a defective unit? My main concerns are the PG value being close to limit and if this shut-off behavior may cause damage to the motherboard, since some currents seems to pass through a couple of times when pressing the off button.
 
Any help or advice is very welcome...   
 
 
 

It makes sense that it would have to discharge after power is shutdown. You wouldn’t want to shutdown the computer to work on it and still have the PSU have a charge it could pass onto the motherboard.