Auto Setting of Vcore way too high

Quad

Golden Member
Nov 18, 2000
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i have an asus a7v133, and i've selected the option to the let bios automatically select the vcore

i know that asus boards usually set the vcore slightly higher than the default, but currently according to mbm5 my vcore is currently at 1.87-1.89 v

before, it was between 1.77-1.79 (1.75 being the default, and the extra voltage caused by the auto setting)
but now it's way higher

what could have caused this? thx in advance