Red = 3.3v adjustment
Blue = overvolt adjustment
Fushia = +5v/+12v adjustment
Green = overvolt adjustment

That's how I see it. The overvolt adjustments are for the +3.3v, +5v, and +12v rails. It's the voltage where the PS will kick off.

+3.3v max ~ 3.8v
+5.0v max ~ 5.4v
+12.0v max ~ 14.0v

Those are my findings at least.