New
#1
HW Info
Ok mate I shall leave it with you I am only going on what Scott Mueller states and what common sense dictates. I have no idea why your machine is still performing as it is in theory it shouldn't but maybe I should just duck out now as I was only trying to offer some ideas of causation for your issues.
As for maintaining those rail voltages that is the purpose of the internal circuitry built into the PSU and if the voltages are as they are in your PSU then in my mind there are components/circuitry that are/is malfunctioning. That is to say in simple language it changes a high voltage low current input into the high current low voltage output required by the computer internal components. If you read the Power Good signal part of that link it explains what happens when the rail voltages are wrong - it should in theory stop the machine (CPU) from booting.
As I said earlier voltages within a machine especially these days are critical in how a component like the CPU operates ie raise the voltage by a decimal point or two and the frequency at which it operates follows suit that is how as you will know overclocking works (in a nutshell).
All I am going to say is that if it were me I would be swapping that unit out because it is non adjustable and would inevitably cost more to fix than buy a new one - if it was worth fixing or could be fixed at all.
One last thing about that device is that because very high voltages are induced to get the high current out of the PSU at a low voltage makes any handling of that device extremely dangerous. In other words it can act like a defibrillator we use at work where the device is used to stop the heart in the hope that it may return to a normal rhythm.
Best stick with the others I think as I work by eliminating possible causes starting at the first component that a machine cannot possibly operate without and work my way up - where some can pick a particular causation. You see I do this for a hobby and am not a technician or do I have the inside knowledge of particularly software / coding issues.
Good luck with the machine I hope it turns out to be something that is easily fixed. :)