DDR4 XMP - High SA Voltage?

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CZSpeedyCZ

Commendable
Sep 25, 2016
5
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1,510
Hi,
I´ve just build new PC and I have problem with RAM XMP - stability and voltage. My CPU is Intel 6900k and I have two 8Gb sticks of Vengenace LPX 3466 Mhz RAM.
Without XMP my SA volatge is cca 0,9xx V. When I turn on XMP, my SA voltage jump to 1,468 V, I am able to boot, but my OS (Win 10) sees just one stick. Other programs like CPU-Z, HWMonitor shows both sticks.
After tweaking I was able to boot with both stics visible with 3400 Mhz and 1,468 V SA volatge, but OS was not stable. Some semi-stable state was with 3200 MHz and cca 1,35-1,4V SA volatge. The main problem is high SA volatge. I read everywhere, that maxmimum safe SA volatge is about 1,25V.
Note: I´ve tried this process with CPU OC to 4,2 GHZ and without OC.
But my main concern is high SA voltage. Is it safe? Or what am I doing something wrong?
Thanks a lot
 
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CZSpeedyCZ

Commendable
Sep 25, 2016
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Sure, I have 1.35 V RAM voltage, it is not the problem. The problem is system agent volatge needed to keep these RAM and system stable.
 
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C

CZSpeedyCZ

Commendable
Sep 25, 2016
5
0
1,510
MSI X99A Gaming Pro Carbon. And yes, both is set to auto. I tried to set SA manually but then the pc failed to boot. But I have not touched I/O voltage and I think it was quite low. Do you think that I can compansate SA voltage with higher I/O to achieve stability?
 
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CZSpeedyCZ

Commendable
Sep 25, 2016
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1,510
I am not sure what is "optimized" default BIOS, but I can revert all changes, that is not the problem (load default values). I am now running default settings without XMP. I tried XMP (working but with high SA voltage and OS sees only one stick - or to be more specific 8GB RAM), then I tried manual settings (I was able to get stable 3200 MHz with cca 1,3V SA). I am running stock settings without XMP.
Now I tried to raise IO voltage a little and then OS showed only 4GB ram (from my 2x8GB ram sticks).
Maybe CPU cannot handle such high OC? (Or only with this high voltage)
 
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Multipack

Multipack

Honorable
Sep 5, 2016
4,283
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9,960
No I know it's not the problem but if it goes away then your manual OCi'ing is off. Doesn't your board have an enable XMP profile setting? All I do to OC my RAM is turn XMP on and everything stays stable. Ish. I/o and SA both at 1.25v. Your board and CPU are more than capable of handling that memory profile which makes me think you are adjusting the settings wrongly but without knowing the ins and outs of your BIOS its hard to say. Do youir voltages do that just by enabling XMP or are you clocking RAM freq. manually. It shouldnt be happening is all I know. Is your RAM definitely supported? Seems really strange.
 
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C

CZSpeedyCZ

Commendable
Sep 25, 2016
5
0
1,510
Nop, I just enabled XMP profile, nothing else. This raised SA voltage from 0.9XX V to 1.4XXV and still OS can use only 8GB ram. Yes, it is really strange, but it is hard to lcate the problem - bad RAM/motherboard/cpu. Anyway thanks a lot for you help ;-)
 
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