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Weird memory voltages?

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ZoranC
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2021/05/25 11:57:02 (permalink)
When I go to memory section of my X299 Dark’s BIOS, pick XMP profile for my memory that has 1.35V as voltage, and reboot back into BIOS I get BIOS reporting that voltage is 1.365V/1.365V, a 0.015V increase over XMP’s setting.
 
If I try to manually set voltage to 1.4V line changes to yellow which I interpret as warning. If I set it to 1.399V it goes back to white.
 
If I with voltage set to 1.399V boot back into BIOS now it shows voltage as 1.412V/1.412V, a 0.013V increase over my manual setting.
 
If I then boot to Windows with 1.399V manual setting, fire up HWInfo and take a look at memory voltages over a period of time (with readout once every 1000ms) I get following:
 
Under X299 Dark Fintek F71889A/879A section:
1.388V min, 1.399V max, 1.399V avg for DIMM 0/1
1.399V min, 1.411V max, 1.400V avg for DIMM 2/3
 
Under X299 Dark (EVGA) section:
0.874V min, 1.415V max, 1.412V avg for DIMM 0/1
0.874V min, 1.414V max, 1.412V avg for DIMM 2/3
 
So first why I see such intermittent huge drops under X299 Dark (EVGA) section of sensors that I don’t see under Fintek one? If I really had such drops wouldn’t system be crashing and not able to pass many hours of memory tests like it did?
 
Second, with X299 Dark (EVGA) section average values constantly overshooting desired values by approximately 0.013V does that, in combination with previous question and BIOS info imply that:
 
a) BIOS is using “EVGA” sensors, not Fintek ones, to display current values
b) HWInfo’s readout is in line with BIOS readout so it is not question of HWInfo reading sensor incorrectly
c) “EVGA” sensor readout can’t be relied on while Fintek one can?
 
Third, I expect some variation in voltages between DIMM 0/1 and 2/3 over period of time. Obviously my DIMM 0/1 can undershoot desired target as much as 0.011V while 2/3 can overshoot it as much as 0.012V, creating a maximum possible differential of 0.023V. Is this amount of variation within normal range?
 
Last, what is exact official reason why EVGA’s BIOS displays memory voltage entries in yellow moment you enter 1.4V?
post edited by ZoranC - 2021/05/25 16:35:14
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    PINKTULIP
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    Re: Weird memory voltages? 2021/05/26 19:42:44 (permalink)
    It has been like that from day one 

    MOBO :EVGA X299 DARK 151-SX-E299-KR  CPU : Intel Core i9-10900X Skylake-X 10-Core 3.7 GHz  LCR :Corsair Hydro Series H80i V2 GPU :SAPPHIRE Radeon RX Vega 64 DirectX 12 100410NT+SR MEMORY: CORSAIR Dominator Platinum SE Torque 32GB (4 x 8GB) CMD32GX4M4C3200C14T SSD 01: SAMSUNG 970 PRO M.2 512GB NVMe PCI-Express 3.0 x4 MZ-V7P512BW SSD 02: SAMSUNG 860 PRO 256GBX2 Raid 0 PSU : Corsair AX1200I 1200 Watts CASE :Thermaltake (Armor+) VH6000SWA SC :Creative Sound Blaster AE-9 5.1 Channels Monitor  Acer XR382CQK  IPS 3840x1600 @ 75HZ BD Samsung B
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    ZoranC
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    Re: Weird memory voltages? 2021/05/26 20:03:03 (permalink)
    PINKTULIP
    It has been like that from day one 



    You too have seen similar behavior? If yes which one of things I have seen you too have?
    #3
    PINKTULIP
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    Re: Weird memory voltages? 2021/05/27 18:38:47 (permalink)
    ZoranC
    PINKTULIP
    It has been like that from day one 



    You too have seen similar behavior? If yes which one of things I have seen you too have?


    Yes, all of them

    MOBO :EVGA X299 DARK 151-SX-E299-KR  CPU : Intel Core i9-10900X Skylake-X 10-Core 3.7 GHz  LCR :Corsair Hydro Series H80i V2 GPU :SAPPHIRE Radeon RX Vega 64 DirectX 12 100410NT+SR MEMORY: CORSAIR Dominator Platinum SE Torque 32GB (4 x 8GB) CMD32GX4M4C3200C14T SSD 01: SAMSUNG 970 PRO M.2 512GB NVMe PCI-Express 3.0 x4 MZ-V7P512BW SSD 02: SAMSUNG 860 PRO 256GBX2 Raid 0 PSU : Corsair AX1200I 1200 Watts CASE :Thermaltake (Armor+) VH6000SWA SC :Creative Sound Blaster AE-9 5.1 Channels Monitor  Acer XR382CQK  IPS 3840x1600 @ 75HZ BD Samsung B
    #4
    ZoranC
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    Re: Weird memory voltages? 2021/05/27 20:17:49 (permalink)
    PINKTULIP
    ZoranC
    PINKTULIP
    It has been like that from day one 



    You too have seen similar behavior? If yes which one of things I have seen you too have?


    Yes, all of them




    ... and it doesn't seem to be only DIMM voltage sensor, I have seen 12V readouts in [EVGA] section also show intermittent dips to so low values that they would be impossible if real without system having crashes. 
    #5
    Edgesunito
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    Re: Weird memory voltages? 2021/06/09 12:28:06 (permalink)
    have you tried different ram?
     
    #6
    ZoranC
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    Re: Weird memory voltages? 2021/06/09 12:29:00 (permalink)
    Edgesunito
    have you tried different ram?

     
    Different memory makes no difference.
    #7
    Exnetic
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    Re: Weird memory voltages? 2021/06/09 13:03:17 (permalink)
    Same voltage readings here. But never had a problem with OC.
    #8
    ZoranC
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    Re: Weird memory voltages? 2021/06/09 13:25:10 (permalink)
    Exnetic
    Same voltage readings here. But never had a problem with OC.



    ... which seems to further confirm "EVGA's sensors" are off and can't be relied on.
    #9
    arestavo
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    Re: Weird memory voltages? 2021/06/10 06:33:19 (permalink)
    You could never rely on software read sensors to be 100% accurate. They're close, but not precision readings - you'll need some nice probes and voltmeters/ammeters if you want precision.
    post edited by arestavo - 2021/06/10 06:34:52

    EVGA affiliate code: 9ZWDWFNW6A
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    FOLD ON
    #10
    ZoranC
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    Re: Weird memory voltages? 2021/06/10 09:37:15 (permalink)
    arestavo
    You could never rely on software read sensors to be 100% accurate. They're close, but not precision readings - you'll need some nice probes and voltmeters/ammeters if you want precision.



    I'm not relying on software sensors to be 100% accurate, however I am expecting them to be close enough. DIMM sensor showing intermittent drops to 0.874V when it should be 1.4V or 12V rail sensor showing huge drops is not even close, it is so far to be completely unreliable.
    #11
    wmmills
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    Re: Weird memory voltages? 2021/06/10 20:49:58 (permalink)
    ZoranC
    arestavo
    You could never rely on software read sensors to be 100% accurate. They're close, but not precision readings - you'll need some nice probes and voltmeters/ammeters if you want precision.



    I'm not relying on software sensors to be 100% accurate, however I am expecting them to be close enough. DIMM sensor showing intermittent drops to 0.874V when it should be 1.4V or 12V rail sensor showing huge drops is not even close, it is so far to be completely unreliable.


    Being that the mem controller is on chip and connected with the SA, it probably drops down because of intels speed step/c1e to match the cpu speed. Stix 2 and 3 may over shoot slightly cause they have longer traces from the socket, and since its a overclockers/benching board they may have thought it was best to give it a tweak possibly. My ram does the same thing too but it hasnt affected the performance so im not too worried about it.  Edit: As far as the memory setting turning yellow at 1.4v is because thats the warning that your getting into max safe territory for the imc and ram. DDR4 isnt supposed to go past 1.45v, on Intel systems anyway. I think you may get to 1.5v with amd i believe.
    post edited by wmmills - 2021/06/10 20:52:41

    MOBO: EVGA x299 Dark, CPU: I9 10900X, RAM: Patriot Viper RGB 3600 32gb, SSD: Samsung 860 EVO 1TB, M2: Samsung 970 EVO+ 1TB, PSU: CoolerMaster M2 1500, CPU HSF: EVGA 240 CLC HSF~ P/P 88CFM Yate Loons, G-CARD:EVGA RTX3090 FTW3 Ultra Gaming, CASE: LIAN-LI PC-V2010B w/ Window mod, OS: Windows 10 Pro 64bit, MON: Alienware AW3821DW, HdSet: steelseries Siberia 

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    #12
    ZoranC
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    Re: Weird memory voltages? 2021/06/10 21:30:30 (permalink)
    wmmills
    Being that the mem controller is on chip and connected with the SA, it probably drops down because of intels speed step/c1e to match the cpu speed.

     
    Except that all of my cores are at same fixed speed and my C states are disabled. Besides, if voltage was really dropping wouldn’t that drop show in Fintek section too, not just EVGA one?
    #13
    Dothes
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    Re: Weird memory voltages? 2021/06/10 21:34:51 (permalink)
    unfortunately that is normal 
     


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    metamana
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    Re: Weird memory voltages? 2021/06/17 02:51:19 (permalink)
    Change ram
    #15
    ZoranC
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    Re: Weird memory voltages? 2021/06/17 10:09:38 (permalink)
    Dothes
    unfortunately that is normal 



    It is my understanding this behavior has been confirmed by other X299 Dark owners too so while it shouldn't be normal it seems not to be an exception.
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    ZoranC
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    Re: Weird memory voltages? 2021/06/17 10:10:20 (permalink)
    metamana
    Change ram



    This has nothing to do with RAM and changing it doesn't do anything (already checked). Besides, it it had to do with RAM and not sensor itself voltage on 12V rail wouldn't show intermittent huge drops too plus whole system would be crashing left and right.
    post edited by ZoranC - 2021/06/17 10:12:17
    #17
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