So I'm at 3.8 MHz @ stock voltage.
Basically this is what my CPU bios look like (no pic, but you get the idea)

CPU Ratio and Voltage

Processor Frequency Multiplier [x19.0 3.8MHz] // Planning to get to [x20.0 4MHz]
CPU/NB Frequency [Auto]
CPU Over Voltage [Auto]
VDDNB Over Voltage [Auto]
LoadLine Calibration [Auto]


Witch one will up my CPU voltage to 1.4 V?

I think you are at 3.8GHz stock.

You need to change CPU over voltage with numpad + button.