GA-Z170-D3H boot issue when overclocked

[Eagle_i_am]

Hello
I have troubles with OCing i5 6400 on GA-Z170-D3H, bios F5b, changed to F5c recently, both same behavior. 4,5ghz, 167 bclk, 1.385 vcore, 1,250 vccio, 1,250 vccsa

And i have troubles of booting my computer after turning off in windows. When i do so, on next start i see looping reboot, every 2 sec before POST done.
I still can normally reboot. I can almost normally boot if remove power cable for a while and drain current from the capacitors.
Actually, i need that high vccio/vccsa to boot "cold". Without it it can't boot at all.

That boot problem is very annoying.

It occurs when i try to set bclk more than 151+
On 150 i can set everything auto, and it goes perfectly stable, always boots normally.
When i start windows with 4,5 ghz (167 bclk, 1.38 vcore) i can run tests, play games.

Look screenshots of my settings:
http://prnt.sc/cj37ac
http://prnt.sc/cj380l
http://prnt.sc/cj38yp
http://prnt.sc/cj38k2
and cpu z http://prnt.sc/cj3c6s



What i'm doing wrong? How to fix that?

Add:
tried to set different FCLK 400 / 800/ 1000, same effect
Uncore ratio 20, 23, 24, 27 - same
PLL overvoltage. Have instability when +45 and pretty ok on 500-600. (+900 is max)
Tried remove manually c-states, tutbo bosst and internal graphics

PSU Cougar PowerX 550w, RAM Kingston KVR 2133 mhz, green, Windows 10 Enterprise

[shadowsports]

Greetings,

Is this your CPU?

http://ark.intel.com/products/88185/Intel-Core-i5-6400-Processor-6M-Cache-up-to-3_30-GHz

Base clk i5 6500 is 2.7
Turbo 3.3

4.5 isn't working.  That's a pretty aggressive OC    I'd consider a "K" series processor for OC.

You may want to ask for help in the OC forum.