These days, group-regulated power supply design is considered obsolete and is ideally avoided—primarily due to the poor regulation under crossload. For example, Shilka pulls no punches here, and while OklahomaWolf is more subdued in this review it's hardly complimentary. Others around the place are positively rabid regarding group regulated PSUs.
Yet, I imagine there are hundreds of thousands (millions?) of users with group regulated PSUs that probably don't know there's a potential problem. Seasonic S12/M12, Antec Neo Eco/HCG, FSP Raider, etc., having been popular models.
So the questions:
Under what conditions will a modern general use or gaming PC cause a PSU to be crossloaded?
What is the practical risk of using a group regulated PSU under these conditions? As in, given the likelihood of it occurring combined with the likely effects, what problems are actually seen?
Are there examples of actual damage or instability caused specifically by a group regulated PSU's poor regulation?
(For the sake of this question, please assume the PSU is otherwise perfectly good quality—not a $2 doorstop—and it is specifically the group-regulated design in question).
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