Help. What overclock should I do?

Sep 1, 2014
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Hi all, I would like to give a moderate overclock my processor. more or less than 4.2 but is quite stable. I never overclock and relizado one but if I explicais the steps in the BIOS not think I have problem

Currently what I have Default

My pc:

i5 3570k 3.4ghz
Asrock Z77 Extreme 6
Corsair CX750M 750W 80 Plus Bronce Modular
2x4gb hyperx kingston pc 1600 cl9
2x4gb buffallo pc 1600 cl9
Shapphire R9 270x 2gddr5
Cooler Master v8 Gts
Box Zalman Z11 plus
Monitor Benq XL2420Z
Windows 7 home premium 64 bits

I hope you can help me. Thanks in advance

PS: In my BIOS vcore 0.992 mark. It is normal ?