I7 6700K Oc Issue

Hello. So, i've upgraded my pc to the next configuration: cpu i7 6700k + cooler Scythe Ninja 4, Asrock z170 pro4s motherboard, gpu card gtx 1070 and 16gb ddr4. I started to OC my cpu to see if i can make it stable at 4.5ghz, because that's the point where i want to keep it. I stabilized it at 4.5ghz(45x100mhz), all core option in bios, at 1.32V and LLC Level 3 (on Level 1&2 it wasn't stable, got blue screen for each). On idle when i turn on my pc, on cpu-z the voltage shows up 1.312V(even though on bios it's Core Voltage Manual set: 1.32V), and because of the LLC Level 3, in stress test with prime95 and aida64, after 10 minutes each, it was stable, but the voltage was 1.280V(with LLC Level 1 1.248V and with LLC Level 2 1.264V), temperatures were pretty fine, 75 celsius degrees in stress. Everything was good, but after 1 hour since i ran the tests, when i was in desktop just doing some ordinary things, nothing to use the cpu even at 10%, i got a blue screen and restart. I said, ok, let's get down to 4.4ghz( i didn't wanted to raise the voltage to see if it will be stable), i set the voltage to 1.30V same LLC Level 3 (again with Level 2 and 1 it didn't worked, blue screen), and again it passed the stress tests, and, after 30 minutes, same thing in normal desktop, blue screen. I set it after to 4.3ghz at 1.28V Level 3 LLC, and for 3 days it was stable, no errors.

I want you to ask if it's possible to stabilize it at 4.5, what other things should i try? I have a friend with a better mobo, an Asus Maximus VIII Impact, and with MY CPU, it was stable at 4.5 @ 1.25V. So, it's because of my mobo? Is it capable only for 4.3ghz? If you have more questions, i am here to respond you all, thanks.

Honestly, z170 pro4 is not the best to overclock;

what about the temps during stress test?

Im use Asrock pro4 no S OC is not easy but automatic OC is working fine 4.6 i5 6600K rock stable .

All on automatic OC +AI tunning program

Overclocking, overclocking, and much more! Like overclocking.

Well,I've raised the voltage from 1.32V to 1.35V, same LLC Level 3, and after prime&aida stress cpu test, all was good. My max temperature was 80 celsius degrees at 1 core, and 77 celsius degrees on the rest. I also played for 1 hour a game, and max temp was 72 celsius degrees. I guess it's ok, right?

Well,I've raised the voltage from 1.32V to 1.35V, same LLC Level 3, and after prime&aida stress cpu test, all was good. My max temperature was 80 celsius degrees at 1 core, and 77 celsius degrees on the rest. I also played for 1 hour a game, and max temp was 72 celsius degrees. I guess it's ok, right?

z170m oc formula may be the motherboard you need

z170m oc formula may be the motherboard you need

Good luck finding one, they're EOL (and it seems Asrock didn't make that many to begin with).

I have only two pieces, you can continue to find answers in the forum