That standby rail is getting jiggy with it in those scope shots. Got a case of the boogy woogy. I respect the standby rail's artistic ambitions, but politely remind it that it needs to calm the heck down.
I found voltage regulation to be mediocre for this price bracket. We see units like the HX850, M12D 850W, ST85F-P, SG850, etc. all pulling 1% or close to it on the +12V, and the AX850 only manages 2%? It's not bad, but for this price I'd expect top notch performance in all areas, including voltage regulation.
It's my PSU in a box!
My PSU in a box, baby!