Overclocking with lower voltage?

[oTrise]

Hello.
I am new to overclocking but watched some videos and managed to get my i5-3570k CPU from 3.4GHZz to 4.2 GHz. Temepratur seems fine and all but I have one question.

Before I set my overclock value I checked some lower voltages my system ran good at. The standard fixed voltage was 1.100 V, but it seemed like I could push that down.
From that voltage I went up and checked at which my system ran good at with 4.2 GHz.
The difference was ca. 0.3V and I am using an Offset of -0.3V now. During stresstests with Prime95 my voltage is around 1.072V - 1.070V according to CPU-Z, which is still lower than the standard voltage at base speed.

Is this the correct way to do it? Using less voltage but getting more performance sounds weird to me. Furthermore I have seen some posts about the same cpu but with much higher voltages.

 

[Justkeeplookin]

Yea usually you can run at a decent overclock with low voltages, however if you go to far, it will be very unstable, because the chip isn't getting enough voltage for the power it is asked for. I suggest go back up a bit to prevent it from happening.

UPDATE:

Each CPU is different whether the same brand, same model. So some people can reach voltages that may seem almost impossible on others, it's all about how stable YOUR chip is, maybe you should find the sweet spot for YOUR chip.