If you have power left and run out of hp just call yourself lucky. Appreciate that your setup does not stress the PSU, it´s a much better place to be in compared to the opposite.

Also: If you go for new thingies, not all PSUs are created equal. For example, between my rackbrute and mantis, there is a HUGE difference regarding the power-on noise: the same module that POPS loudly in the rackbrute still pops in the mantis, but at a much more civilized level. And yes, this is a dediated output module and the level is set to zero. Still popping.