Hello,
 
I found out strange problem regarding my memory frequency, intel 750 and z170 mb.
 
Here is my setup:
CPU: intel i6700k
MB: evga Z170 Classified K
VGA: evga GTX 1080 FTW
PSU: evga 850 T2
RAM: 2x8GB DDR4 G.Skill TridentZ F4-3200C14-8GTZKW (14-14-14-34 @ 1.350V)
HDD: Samsung 950 Pro @ 1 110mm M2key Slot, shared with SATA 4/5 (so i have SATA completly disabled)
Intel 750 @ PE4 – PCIE 16 Slot @ x4, 4 lanes from PCH
bios ver: 2.01 (also there was same issue with 1.04)
 
Problem is that, when i start computer with default XMP settings of RAM, that means RAM frequency 3200MHz, Intel 750 wont load up.
To make Intel 750 working, solution is: Reset computer, go to Bios, leave XMP as it is but change frequency to 2933Mhz. Save settings. After reset it will be not working but when I turn off and on computer again, it will be working with RAM @ 2933Mhz.

What is strange -> so i have my RAM @ 2933Mhz and Intel 750 working, when i reset computer to bios and change RAM to 3200Mhz(standart XMP setting) and hit save and reset -> Ram will be working @ 3200MHz and Intel 750 is also there!
 
So apperently Intel 750 wont load only if there is 3200Mhz on RAM with cold start (from power off to power on). But it will works with RAM @ 3200Mhz if there was reset only (no power off).
 
And the question is why?
Why Intel 750 wont show up with ram @ 3200Mhz when computer is cold started so ram have to be @ 2933Mhz?
Why is Intel 750 working with ram @ 3200 after cold start with 2933 then reset to bios and change to 3200Mhz?
 
This is very strange to me but if I want Intel 750 and RAM @3200 working I have to turn on computer with lower frequency(2933) and then reset computer and change it to proper(3200) freqency in bios. Otherwise Intel wont show up.
 
Can somebody point me where i should look to fix this? Some voltage maybe somewhere?
 

Thank you for reply.
 
I tried several test and its still same. BCLK is always 100Mhz. And even i set RAM manualy, its not working.
I always have to cold boot first 2933Mhz then I can reset to bios and change it to 3200. I even try to set manualy settings that worked 3200+Intel -> VSA, VCCIO and all setting on ram. No succes. I just can not cold boot on that settings even they are working after soft reboot after changing 2933->3200.
It have to be some hidden config there, or something is not overwritten if not cold boot and not showing. I dont understand this. However all values are reported correctly at HWINFO in Windows, also ram settings are changing.
Its really strange but i feel like I am playing with some motor machine that I need to start it lower and then i can push it higher. It really seems like some frequency of voltage somewhere but I could be wrong, because I copied all the setting from ram and voltage from working 3200+ram and still cant cold boot it with that... (it runs but without that intel, ram freq are changing always correctly just intel is not showing up)
 

You probably need to raising the VCCIO a little higher.  I would do this in small steps.  The range is
0.95 ~ 1.8 volts.  I have mine at 1.040 V for 2666.   This voltage is what drives the input to the memory.  I have 1.2v memory sticks.  For the 1.35 (higher speed) memory you need to raise the VCCIO.

My bad, missed the Samsung m2 in you first post
 
Is PCIe set to "Auto" or manually in BIOS to PCie 3.0 -- for Intel PCIe SSD drive ?

Cool GTX
My bad, missed the Samsung m2 in you first post
 
Is PCIe set to "Auto" or manually in BIOS to PCie 3.0 -- for Intel PCIe SSD drive ?

It was set to Auto for GPU and for Intel also.
I manually change it to Gen3. Also turned off fast boot. Bios performed cold boot apperently because I changed those settings and after reboot there was no intel :(.
 
So yeah its still same, when there is power cut I can boot that intel only with 2933 ram modules. So i had change ram back to 2933. Save it. Perform another cold boot (because only changing frequency in ram doest make cold boot from bios). Then my intel appears, entered bios again, changed ram to 3200. Save and soft reboot. And I am here with 3200mhz ram and intel working.
Its pretty much my daily routine now with that restarts. But it should not be like that. I just dont understand why it cant load from power off mode(and 3200mhz on ram) but its pretty much working ok after additional soft reset and memory frequency change from 2933 to 3200.
If it was not working at all i would understand that. But apperently its working, but I always had to do this crappy workaround. With 2 additional restarts per session(1 at start of session and 1 before end of session, so I have to put my ram back to 2933 before power off so I will have disk loaded up when I would like to use computer next time.

Set VSA, VCCIO & PCH 1.0 to 1.25v then retest the system.

Biosko

Sajin
Set VSA, VCCIO & PCH 1.0 to 1.25v then retest the system.

Tried that, but as you can see only GPU shows up :(
 

How does the system run when the intel 750 is running on 3200 MHz ram?