Question Help memory overclocking

[Furry Daniel]

How to overclocking DDR4 get 3600 or up? But I've been tried overclocking DDR4 it is impossible and crashes fast reset my bios settings? I tried make timings slower and more system agent/VCCIO voltage still didn't get stable?
I'm confused so it is different cause I've been overclocked DDR3 and things old.

Will be you help how it is possible?

Specs:
Motherboard:Gigabyte Z390 UD BIOS version F8
Memory 2x8=16GB Part Number CM4X8GD3000C16K4 (DRAM manufacturer SK Hynix) I'm using XMP 3000 but overclocked 3200 still working but can't get 3300 or 3600? I've been tried test how it is work.
i7-8700 without K being locked, does can overclocking memory or allowed?

3200MHz agent system/VCCIO voltage 1.25v, i don't see any check voltage or health, I don't understand what it is mean?

 

[MrN1ce9uy]

Honestly, I'd stay at DDR4 3000, but if I really wanted to overclock I'd go with a dram voltage increase up to 1.4V.

 

[Furry Daniel]

dram voltage 1.4V is safe, I'd can use dram voltage 1.4V but SK Hynix limited voltage safe or use XMP voltage.
I'm not know any new overclock. So i'm new there.