How to sett Offset? + Overclocking Issues?

[Kratos]

Hi guys, I've got my CPU & GPU & RAM Overclocked, the thing is that I often use my pc for Video Editing and Gaming. I've had the same Overclocking profiles since June, so it's been now more than 5 months; the thing is that Once I had a BSOD a month ago while video editing at 98% complete (It sucks I know), at first I didn't bother but, then yesterday I got another one after playing for over 1 hour GTA 5, I've no idea how this was because during the summer with ambient temps of 35 degrees, I've played like 4 continued hours a couple of days, so I've no idea why this is, so here are some questions:

 

-How do I know what has caused a BSOD, I mean, where does it show on the screen?

 

I've runned a ton of stress tests on my GPU and it's fully stable, so it's not the GPU I'm 100% certain on that. I suspect it could be my RAM because my RAM has been Overclocked since only 2 months ago and before that I didn't get a BSOD. So I might turn off my RAM OC.

 

Also another big question and the main one, How do I set a Voltage Offset to my CPU? I would like it to last 4 years at least and I've always got it running at 1.190V, I would like it while idling to run at 0.7V, I'm worried to degradate my CPU too quickly with this amount of voltage, here are my OC specs/profile:

 

-CPU: I7 4790K@ 4.7 GHz , 1.190V (everything else is untouched)

-RAM: Kingston HyperX Blue 32 GB DDR3 1600 MHz CL10 (4X8GB) @ 1866 MHz, CL10, 1.520V, everything else untouched.