Yeah, you'd need a PS that can handle ~70A on the 12V rail at minimum (ignore the total wattage of the powersupply as it's an irrelevant rating, and excluding any power hungry video cards etc ) and add in the considerations that as they age, Power Supplies cannot handle the rated power (on average they lose ~10% a year)
Thanks @trurl I didn't think of that....
Additionally if it's possible, avoid using the Marvel controllers. Marvel is one of those companies that since they realize that they can't compete don't even bother with keeping their drivers functional, and random drop offs are one of the nagging issues that they have. Disabling VT-d in the BIOS (if you're not running a VM that requires passthrough) may help