Hello 
 
First im sorry for my bad English but ! i will try my best.
Im really noob about OC this is my first time but before OC I try some basic stuff like load my XMP
 
So :
 
Spec : CPU : I7 8700K 
          GPU : 1080 TI
          SSD : 970 PRO SAMSUNG M.2
          RAM : Corsair 2x16 32GB 4000 mhz 
(Corsair Vengeance LPX 32Go (2x16Go) DDR4 4000MHz C19 XMP 2.0 Kit) 
(CMK32GX4M2F4000C19  )
          PSU :Platimax Enermax 1200w Platinum
 
So i have some issue whit my MotherBoard  
When i try to load my XMP profile (4000 mhz ) i get ... crash : / 
So i try 3400 everything else set to ( auto )  work ( long boot )
           3500 MHZ work ( long boot )
           3600 MHZ work ( long boot )
           3700 MHZ crash ! ( long boot )
(My pc portable was much faster boot than my pc ....  :/ ) 
 
So i was limited to 3600 MHZ , and whit some luck iafter some games test , i get 3700 MHZ work ! 
3700 finally work, but after reboot my motherboard have totaly broke down no display screen pc , no bios display , nothing only the small display in the motherboard work ,give me error and  each boot has a different error code .... ( no usb work , fans stop work too etc ... etc...  ) 
So now im waiting my new MotherBoard. 
 
 
And the question is : How to get my 4000 mhz work ... ?  and what is the best Ram Timing  for my Spec ?
 
 
 

The crash when XMP is set - is that immediately or on reboot?
 
When you set the XMP what is the voltage set at and what does it set the BCLK too?
 
What slots are the memory sticks in? Should be 2 and 4 - look at page 27 of the PDF manual
 

See my edited post above

The slot look like  
 | |  | | 
and i put mine  , there :  |  |  |  | 
                                    x  x
So i guess , SLOT : 1 and 2 start (left side )

thejedi78200
The slot look like  
 | |  | | 
and i put mine  , there :  |  |  |  | 
                                    x  x
So i guess , SLOT : 1 and 2 start (left side )

Nope Slots 2 and 4
 
Look at page 22 of the manual for the full picture
 

Yeah i see right now page 22 in the manual and like i said i put my ram both ram in the TWO left side slot.
Im wrong ? this is wrong slots .. ? 
I do not know if that's why the xmp profile does not load

Jesus christ ... so this  is " MAYBE "  the reason why  my MotherBoard  w'ont load the profile 4000 mhz .... ?!

If my motherboard is broken down after 1 day after use so it's a manufacturing problem ?

There is also this bit on that page -

Note: The memory controller on most Coffee Lake-S CPUs runs at a default
frequency of 2666MHz. Achieving memory speeds above 2666MHz+ may
require manual setting of the memory timings, frequency and voltages and/or
overclocking of the CPU.

 
 



Yeah but if i just load my profile , i dont really need to setting anything right ? btw im really new whit oc world lol
 
Hop whit my new motherboard i will run ez pz my profile xmp and no more slow boot ! :)))

Sajin
To get 4000 to work you'll most likely need to tweak your vsa & vccio voltages to 1.25v - 1.35v.

Hi ! 
But im totaly noob at this .. i mean this gonna be the first time for me in bios doing this stuff.
 
So load my xmp profile to get 4000 mhz it's not enough to run 4000...  ?
 And i necessarily need  tweak vsa & vccio and voltage to 1.25v ~ 1.35v to get 4000 work fine.. ? 
 
Spec : CPU : I7 8700K 
          GPU : 1080 TI
          SSD : 970 PRO SAMSUNG M.2
          RAM : Corsair 2x16 32GB 4000 mhz 
(Corsair Vengeance LPX 32Go (2x16Go) DDR4 4000MHz C19 XMP 2.0 Kit) 
(CMK32GX4M2F4000C19  )
          PSU :Platimax Enermax 1200w Platinum

Sajin

thejedi78200
So load my xmp profile to get 4000 mhz it's not enough to run 4000...  ?
 And i necessarily need  tweak vsa & vccio and voltage to 1.25v ~ 1.35v to get 4000 work fine.. ? 

Correct.

Thanks you,
Can you give me tips or a basic setting , anything work for DDR4 2x16 32gb 4000 mhz ? Please

Sajin
Simply enable xmp & set your voltages up like I said then save and exit the bios. See if that works or not.

 
Ty
So load profile , change de voltage littel bit higher 1.25v ~ 1.35v and done ? no need for me to weak vsa & vccio ? on the official website of corsair it is written :
 
Tested Voltage : 1.35V
Tested Latency : 19-23-23-45

Sajin
No problem. Load xmp, tweak vsa & vccio to 1.25v - 1.35v, save and exit bios.

I really apreciate Sajin thanks you again.
CpuVdrop disable + if i want oc my i7 8700k  whit the same setting ?
 

All right ! perfect.
Anything else to disable in oc for cpu  ? i would oc to goal 5.0 stable 

@Sajin 
I'm going to test whit my motherboard coming soon, I'll be feedback :)