Limitation of MOBO with dual channel DDR4 speed?

[sirocu]

I have ASRock Z370 Gaming K6 and G.Skill TridentZ 3600C15 (2x8GB) can reach to 4400MHz on this mobo timing 19-19-19-39 1.45V dual channel without any issue but can't boot into windows at 4500MHz with two sticks(dual channel). When I try with one stick it can boot into windows with timing 19-19-19-39 1.475V. (Each one stick is work best on a single channel at 4500MHz with this mobo, timing 19-19-19-39 1.475V.)

So I want to know if this situation is a limit ddr4 dual channel speed of the mobo, right?
And if there is a solution to skip this limitation how can to do that?

Sorry about my Eng.

 

[Lutfij]

It'd be the motherboard/memory controller. Running all slots on the board at high frequency's stresses the memory controller onboard the CPU. Are you on the latest BIOS update? I hope you also know that the max you should stick with DDR4 is 1.35v if you want to run it 24/7.

The Gaming K series isn't on par in terms of quality components on the board, mind you.

 

[sirocu]

Yes, I've updated the lastest BIOS version.

Just wanna try OC cpu/ram for education don't want to play on high voltage all the time.
Z370 Gaming K6 has digital PWM, 12 power phase, 60A power choke,dual-stack MOSFET (DSM) and XXL aluminum alloy heatsink I think its good enough for test at this speed and this voltage.

Thanks for your reply.