I understand about the efficiency also the power factor is usually poor on lightly loaded equipment. I run into this alot on large UPS systems. They will generally induce harmonics and the PF and efficiency suck when lightly loaded.
I guess I wil just stick to one PSu for each board. I have a R2E w/965, Classified w/ 975, and REX with QX9650 or E8600 or E8500. Looks like I need another PSU for the 3rd set up.
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