New at Overclocking - Need some help!

[Joe454123]

So I just overclocked my intel i5 4670k for the first time and I was wondering if some of my readings are normal. (I'm using the asus z87 pro motherboard and a h100i cooler). I just overclocked my cpu to 4.2GHz (That's all I need right now) and I have it running on 1.250 volts right now. When idle I the core clock goes down to 800Mhz and the temps are anywhere from 33 degrees celsius to 37 degrees. When I run prime95, clock goes up to about 4200MHz, occasionally going down 10 - 25 MHz. Temps are about 62 - 70 degrees celsius. After about 10 minutes the program freezes and I lose all response in my computer. What can I do to prevent this? I don't have a large power supply (Corsair 650TX) and I'm not sure If I should go up to 1.300 volts or what. Also, at these temperatures and voltages will the significantly cut the life of my processor (I'd like it for at least 3 to 4 more years)

 

[Joe454123]

Last sentence is supposed to read "Also, at these temperatures and voltages, will there be a significant cut in the life of my processor?"

 

[bigcyco1]

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These might help you understand.
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http://www.overclockers.com/3step-guide-to-overclock-intel-haswell
https://www.youtube.com/watch?v=1DqIG_89Mcs
https://www.youtube.com/watch?v=0CHs5_TdpXE

 

[Joe454123]

I think I figured out why my core clock was bouncing around. I just switched my computer to high performance mode and it seems to have become stable idle or not.