Memory is not going beyond 2666mhz

[Saad Arain]

I am facing a problem with my Ram recently I bought 3200mhz ddr4 g.skill Trident Z Royal cl 16.18.18.38. So it is working fine on default 2133mhz when I tried to enable XMP it auto detects and start running at 3200mhz with cl 16.18.18.38. When I restart my pc in order to save settings it took at least 5 minutes and even after that it showed error to press f1 to go back to setup it automatically changed to 2133 again so I tried it with different setting volts but maximum it goes up to 2666mhz with same latency and 1.35v. After that tried 2933,hz setting loaded successfully but stop while logging into windows and showed blue screen multiple times so its not working after 2666mhz. Latest bios are Installed asus 2401.  tried setting manually and auto but not working. So I tried it with my friends setup Amd 3700x and X570 Tuf as soon as I opened Xmp ram was working fine even I tried to push it a little and it was stable on 3600mhz.
Board Asus strix Z370F gaming 

Processor I7 8700k

Ram DDR4 3200mhz g.skill Trident Z Royal cl 16.18.18.38 

[SupaKomputa]

8700 officially support max 2666mhz.

[Saad Arain]

4 minutes ago, SupaKomputa said:

8700 officially support max 2666mhz.

I know but even my 6700 which supports 2133mhz can handle 3000mhz memory without any issues and it should not matter how much processor can support my board is capable of 4000mhz ram 

[Tristerin]

19 minutes ago, Saad Arain said:

I know but even my 6700 which supports 2133mhz can handle 3000mhz memory without any issues and it should not matter how much processor can support my board is capable of 4000mhz ram 

Incorrect.  Your CPU memory controller only guarantees 2666mhz.  Your board memory controller guarantees increments up to 4000mhz - they dont work independently.  XMP isnt working so manual OC will be required beyond specification.  

 

Sometimes you get a gold sample and it XMPs without a thought.  Other times you have to dial it in.