Which voltage value do I take?

[nuhash]

When setting the voltage do I make sure the BIOS value is reasonable or I do I use the value in CPU-Z because CPU-Z gives a slightly lower value (about 0.1-0.05v).

[killerx525]

Both are fine, don't quote me on this but the reason why CPU-Z is giving a slightly lower value is because the system is idling.

[Fordox]

try hwmonitor or open hardware monitor.

the values that you put in the bios, will never each it exactly. under load, you allways get some vdroop (and with high llc vboost).

so use software to read out your actual volts. cpu-z is a bit to slow for that.