Overclocking i5 2500k 4.5ghz

Hello i wanted to overclock my I5 2500k to 4.5 Ghz but whatever what Vcore I Use i dont manage to get it stable under 1.350 prime crashes instantly and @ 1.4 it does run like 1 hour and crashes..
But 1.4 seems to be very high to me already...
I managed to get 4.2 stable @ a vcore of 1.3
Could anyone help me?
Also i noticed that i can't find some settings in UEFI other people change I'm on U1n.

Mobo: GA Z68x ud3h b3
CPU: i5 2500k
GPU rx 480
RAM: 8gb ddr3 1600
CPU Cooler: Cryorig H7
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  1. Best answer
    Luck of the silicon lottery :/ But... 4.2Ghz is not terrible
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