I may be running on nothing, but it seems to be ok at 3.8GHz.
I would recommend setting it to 3.8 and raising to core voltage a tad, only to the next highest, since it seems to be ok. Then see if its stable, i just think that it can run on the voltage at 3.8, but needs a bit more.
i may be called vcore or core voltage, im not too sure..