Question 3200 cl 16 ram runs at 2666 cl 19 ?

Sep 21, 2020
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Hello, i5 10400f , h470 non xmp board, gammix d30 3200 cl 16-20-20 I know 2666 is maximum allowed, but why latency is 19? A data brochure says 1.2 v cl 16 is compatible but atm runs JEDEC standards cl 19. I can put manually timings but not sure if I should do it. Bios shows that vram voltage is 1.350 but dram drop list shows 2666 1:20?

If I need to put manually timings, please give some tips, I can do 16-18-18 but guess this is not enough.
 
Sep 21, 2020
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CPU Z and Bios showed the same cl19-19, changed it to 16-18-18-39 manually and after few hours of mem64 test no problem. The RAM manufacturer states 1.2 v is 16-18-18 compatible. Now Cpu Z and Bios both show 16-18-18-39