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What i recommend:

use different test programs:

hci memtest pro and karhu RAM Test

normaly i would only use hci, because it founds every time errors and karhu runs12+ hours stable.

Now i...

Testing now the G.Skill 32GB 4266 17-18-18-38 Kit - first impression: more difficult to get stable and needs more voltages.

Running now MemTest Pro (which works best for me finding errors).

My 9900K worked only with 3900 17-17-37

My 9900KS works with full speed - here is my setup:

2019/11/05 20:00:53]
Ai Overclock Tuner [XMP II]
XMP [XMP DDR4-4140 17-17-17-37-1.40V]
BCLK...

Search for (in Bios)

Boot VCCIO & Boot SA Voltage

I set both to 1,29375v - after booting it use 1,2250v for both voltages.

Thats the voltages my 9900KS needs to run.

Did you set the SA + vccio boot voltage ?

In bios you can set higher voltages for booting the system - and then it will take the normal voltages.

lol running G.Skill 32GB 4.133Mhz 17-17-37 Kit the first time on the Asus Maximus XI Extreme (thanks to the 9900KS)!

Now running (and reaching) 24 hours HCI MemTest Pro and no errors (reaching...

I found the solution:

- tWRWR_dg was "8" and have to be "4" (thats fixes the bad WRITE performance).
- disable MemOk! on Mobo
- loading XMP II Profile and set the voltages higher

> the...

Update:

the memory will work only with max 3.600Mhz - over 3.600Mhz the system will reboot often and MemOk! will reduce the memory speed 100mhz less.

The strange:

After MemOk does its job it...

Ok it looks its only when i try to set the 4.133mhz for the memory.

This time the Board did not boot twice..

Hi

replaced my 9900K with the 9900KS did a Bios reset and a Bios Flashback with the same bios,
because this combo shows a strange behavior.

Every time i want to run the memory with 4000+ Mhz...

Thanks - works great! :)

Maximus XI Extreme,

is there a way to save the bios to *.txt file for printing?

THX for helping!


Edit: i know there is F12 for saving Screenshots on a usb stick (but i want *.txt)

In november the cpus will be released ;)

You have to try this (this helps me):

The problem: my system reboots very often and did not start windows

The idea: during booting the vccio/sa need much more voltage then in windows.


...

thanks i will check this!


Edit: Thanks this helped a lot!

Now i can boot 32gb @3900mh-17-17-37 via higher voltages and then in windows it uses lower voltages:

CPU VCCIO Voltage: 1,0625v...

@Carlyle2020

Thank you very much! This helps a lot :)

BTW: i found a solution for running the Kit @4.133Mhz CL17.

normal i'am not able to boot the system over 4000mhz.

- I removed 3 mem...

Is there a way to give for booting higher voltages ?

My system runs perfect stable at 3.900Mhz CL17 but i have problems during booting - system hangs often
in a boot loop.

In win 10 i need...

Yeah that sounds be better! (could be imagine that on reboots the mobo tries to use T1 an fail again..)

BTW: trying now 3.800Mhz CL17-17-17-37-2N > pc boots without any problems - no windows...

Did you use Mode 2 ?
and the memory fixed at 2N ?

BTW: 3.866Mh is pretty high too - dont think my cant handle this (or better: my cpu).

@cniedzi

Did you see my post here? This could be interesting to you:
...

Hello, maybe the Macrium Reflect Home and WinRAR Error is another error!?

I have the extreme board and since years i put my optical drive on the SATA6 (6) Port (the last one).

This time i...

Short update:

hci memtest pro v.6.3 find Errors on 4000mhz Memory lowering to 3866mhz still find error - even with high voltages (VCCIO & VCCSA 1,30v)
So i have to test more…


@Loadlineac
...

Thanks for helping me!

M.2_1 is the place where i installed the Samsung 1TB 970pro - and you was right - its a little bit tricky to remove the cover ^^

Thanks for the info - hoping to see the bios soon.

This should be the Link BUT its !!! not offical released!!!
...

Still using Mode 1.

CRC Errors with macrium i have to check.