I7 2600k 4 4ghz voltage

[sefiremre]

Hello,
P8Z77-V LE plus
i7 2600K
2XGSKILL 4GB Ripjaws DDR3 1600MHz CL9 1.5V
Cooler Master V8
PSU : 750 W GX 80 Plus

i did 4.4 overclock 1.3v , i used test aida64 ext. Edt. 3 hours system work stability but some ppl say 1.25 -1.30v try which voltage is tsability and safe for i7 2600k on this system

 

[sefiremre]

no one help for me ?

 

[sefiremre]

thank you im not change it than