I run stock 1.4v but either the motherboard monitor display is off or my motherboard is undervolting to 1.36v. Regardless, in BIOS, I am setting pretty at stock voltages for the 3700+ Sandy and I see no need to stray away from that.
:techgage:
I run at 1.4 volts. You do NOT need to put a lot of voltage on an AMD processor to overclock it. The nice thing about AMD is it overclocks well at low heat output.