Dynamic Vcore Voltage Confusion and Overclocking

So, I bought an hyper 212 plus aftermarket cooler a few weeks ago, and then, I wanted to overclock my i7 2600k to 2.4 or 2.2Ghz, but I don't understand this thing about the vcore, since I have a gigabyte mb I only see Dynamic Vcore, QPI VTT voltage and some others

Thing is, I don't know what to do anymore, I set the BLCK to 100mhz, and then, the multiplier to 42, so I could get 4200mhz (everything else to Auto), and then, I ran that intelburntest program on maximum (if that's the highest setting) and left it running 40 times, when I came back it said that it crashed and that it could be because various reasons.

My temps are, disregard idle, it's around 31-34c, so, meh

@ 100% it's around 64-67, a lil high for that heatsink, as I've heard

Later, I tried with 4.4Ghz, this time I set the Dynamic Vcore voltage to +0.150 then ran prime95, unfortunately it reached 78c at some point so I didn't want to stress it even more, next test was with +0.170
everything else on Auto, of course, it ran cooler, 71-74 @ 100% (error in the first core in the first test, yep) , but I thought it was still way too hot, so I set it to +0.200, and, boom, hotter, so, I don't know what's wrong, what do I have to change, I've read lots of guides and everytime I overclock I end up with errors, last night I was streaming emulated Resident evil, the remake, everything maxed out which would probably stress the cpu a lot, but it was running at 34-38% due to HT, showing 4 more threads, giving a result of ''if real cores are at 100% = 50% if the other ones aren't being used'', to my surprise, it doesn't even use the real ones at 100%, anyways, after an hour or two, it crashed, didn't give me a bsod or froze my computer, no, the emulator simply crashed, which I think it's related to the recent overclock (4.2Ghz), also, I've been worrying over the fact that I might degrade the lifespan of my cpu because I don't know how to set the vcore voltage, correctly.


So, my question is, is there something I need to know or is everything based on luck?, I've been overclocking for 2 days and 4.2-4.3 ghz was the most stable config I could get, till 2 hours later when testing.


Thank you to anyone who answer me or help me, in advance, in the meantime I'll clock my cpu back to 3.4.

CPU: i72600k, CPU Stepping D2
Motherboard: Motherboard Name Gigabyte GA-Z68MA-D2H-B3
RAM: Kingston value ram 2 4GB sticks, AIDA64 info @ 609 MHz 8-8-8-22 (CL-RCD-RP-RAS) / 30-98-4-10-5-5 (RC-RFC-RRD-WR-WTR-RTP)
PSU: Cooler Master eXtreme Power Plus 600W
GPU: GTX 560 ti (just in case you want to know)

Overclocking now, again
This time I set RAM performance to standart, since it was on fast or something like that.

Blck set to 100 and mulitiplier to 42


Now running prime95

2 Hours and 1X minutes in


-update-
11h and going strong, going for 12 .