For us it isn't under "PC health". Just temps and fan speeds there.
I've noticed this as well. I'm leaving mine at the default 1.75, which shows up at 1.88 on the other programs to monitor it. I don't know how you measure the "true" voltage. Anyone know where to hook a multimeter?
Since I'm running OC'd anyway (9.5 x 120 = 1100) I'm leaving it. Temps stay in the low 40's, even during games, so I'm not too worried about it, but have a nagging feeling I should be.
Try setting the voltage lower manually, until Sandra and the others read 1.75. If it continues to run without a hitch, it should be running cooler as well, so leave it that way I suppose.
I think I'll do that on my next restart.
Good question, anyone have a real answer?