captaincranky
Posts: 19,649 +8,795
I had the PSU inspected by a specialist at my previous employers (Builds and maintains PSU's for aerospace manufacturing equipment) and they said it suffered a considerable increase in voltage (e.g. a maaaaasive power surge). From what they have said its doubtful even the best PSU could survive it, or isolate against it in regards to other components in the computer.
So the Corsair HX750 was most likely absolutely fine - Put it this way... I would have another one tomorrow now I feel I know the full extent of what happened.
As a culprit, I would look toward the Electric company's power substation. That's the only place to attribute such a catastrophic voltage increase. Insufficient voltage would be more likely to be the side effect of too small feeders.("Brown outs", localized to your particular home). Maybe "The Queen's Power and Light" got hit with lightning themselves.