I don't mean to be rude but I've Google it before asking this question and know exactly what Load-Line Calibration does in fact I'm using it for my OC on my Ryzen 1200 @ 2.8Ghz (Prime95 24.5 hours stable) but the question I'm asking is what does the VAXG Loadline Calibration setting in the BIOS do or control because it's definitely not vCore related since a vCore Loadline Calibration setting already exists in the same BIOS.
BTW, none of the above links mention anything about the VAXG Loadline Calibration, what it does or which specific voltage it provides Loadline Calibration for.