Originally Posted by Schoenfeld
The answer is right in the posting that you've quoted: ATX PSUs don't treat the 5V rail as a critical line. Regulation on that rail is average, but not good enough to maintain stable operation of a computer that is 5V-based.
How kinky is an Amiga then, since I have no problem with high quality ATX PSUs manufactured by FSP. If I check decent FSP PSUs I see that the ripple on low loads (around 25 percent load) on the 5v rail is 9mV is that low ammount really a problem, seems decent enough.