G.Skill 3866 won't boot in 3866 (Asus Z270F)

[robaczek]

Hi all, new member here, but avid Asus user for over two decades 😉

So, I just upgraded a few components, specifically I have now ASUS LGA 1151 STRIX Z270F GAMING Intel Z270 with G.SKILL F4-3866C18D-16GTZKW Trident Z Series 16 GB (8 GB x 2) DDR4 3866 MHz CL18 Dual Channel Memory Kit and i7 7700K running at stock.

I can boot into 3733MHz stable when I set:
CPU VCCIO Voltage - 1.20V
CPU System Agent Voltage - 1.23V

But I cannot boot at all into 3866 even when both are set to 1.25V (didn't try any higher). I have XMP turned on, so timings and voltage is set as per manufacturer recommendations. I already exchanged one exact same set to another thinking that maybe it was the memory, but no, second set also won't boot. Machine turns on, but screen after few seconds goes black (no signal), never showing anything. Then all I can do is press the power button (even the Reset won't work) after which the computer boots with safe settings with 2100MHz asking to go to Bios and make amendments.. Pls help 🙂

[Shadowline_2332]

I have the same memory, not yet build my machine yet, but reading from the listed specs of the ram 1.35v is the voltage to reach the rated speeds... but really depends on the CPU. Possibly in order to reach those speeds the CPU needs to go higher, though that is just a theory since I've not yet built my machine.

[Chino]

Clear your CMOS.