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RTX 3090 FTW3 memory junction temp overheating

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konmanr
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2022/05/05 13:23:37 (permalink)
Hey all. I just bought a brand new 3090 FTW3, and I keep running into an issue where the memory junction temp is hitting 110 and then the whole card gets throttled and everything slows down. I have read many posts about this and I am really not getting a satisfactory answer. I have Precision X1 installed and all temps look good, but GPU-Z shows memory junc temp and it heats up very fast and as soon as it hits 110 I see the Mhz on all the clocks get lowered way down until it cools down. From looking at EVGA software I would have no idea what is going on, it doesn't list the memory junc temp.
 
So the question is this: where is the temp sensor for the MJT? what specific part or side of the card is hitting this 110?? Also there are clearly parts on the back of the card, if these are the ones that are hitting 110 then why can I not see this readout anywhere?
 
Looks like I can't post an image or screenshot here. But my temp readouts are:
 
Mem1: 72
Mem2: 73
Mem3: 69
GPU1: 58
PWR1:50
PWR2:54
PWR3:57
PWR4:75
PWR5:60
 
MJT:110
**
 
I would appreciate any help.
Thank you
post edited by konmanr - 2022/05/05 13:29:45
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    jaredbyoung
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    Re: RTX 3090 FTW3 memory junction temp overheating 2022/05/05 13:29:52 (permalink)
    Are you hitting 110C on the memory junction at idle? Intense gaming? Some productivity task? Or... mining?
     
    If anything other than mining I would contact EVGA support. You might have a physical issue with a thermal pad or something.
     
    If in mining, well, you're gonna need to lower your mem OC and power limit which will mean your hash rate will be lower. Or you could explore DIY solutions.
    #2
    konmanr
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    Re: RTX 3090 FTW3 memory junction temp overheating 2022/05/05 13:33:12 (permalink)
    It is during mining, but it is not overclocked. This will happen at stock settings or even if I underclock it lower and with low power.
    I know it is heating up because I am stressing it with the mining and I need to explore how to cool it better, but I need to know what part or what side of the card is getting hot? So I can know how and where to cool it.
    #3
    zippytek
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    Re: RTX 3090 FTW3 memory junction temp overheating 2022/05/05 13:40:25 (permalink)
    konmanr
    It is during mining, but it is not overclocked



    prob need to repad it, or at the very least add direct airflow to the backplate with another fan or 2
     
    and 3090 ftw3 ultra? does come overclocked. you not overclocking it above the factory oc just means you're running at stock oc
    #4
    konmanr
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    Re: RTX 3090 FTW3 memory junction temp overheating 2022/05/05 13:43:45 (permalink)
    I did actually just repad and use kryonaut extreme thermal paste....
    and still getting the same issue. That's why I then came here to post.
     
    Does anyone know where the MJT readout is coming from? How do I know what part or side of the card is heating to 110?
    I have a feeling it may be the back of the card, but I'm asking... How do I know? There appear to be no temp sensors on the back?
    Where is this MJT readout coming from?
    #5
    RogueMaster
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    Re: RTX 3090 FTW3 memory junction temp overheating 2022/05/05 13:46:02 (permalink)
    Do you have proper airflow on the card? If you have a cluttered case with poor circulation, you're going to need to remedy that.

    Assuming you have 'clean' air in the case, you could try actively cooling the back of the card. If you have room, adding fans that blow directly on the card may help. Some folks have also used heat sinks applied directly to the backplate.

    Hitting 110 is common in mining. If that's the cause, you're going to have to look at lowering the OC settings and/or finding a way to cool the card through mechanical means.


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    konmanr
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    Re: RTX 3090 FTW3 memory junction temp overheating 2022/05/05 14:01:46 (permalink)
    I appreciate you all trying to be helpful and giving good suggestions, but does anyone actually know the answer to my question? Where is the MJT sensor? Where is this temperature readout coming from? Is there no way to know where this temperature is coming from?
    #7
    Sajin
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    Re: RTX 3090 FTW3 memory junction temp overheating 2022/05/05 14:06:34 (permalink)
    The junction temperature is the temperature of the microscopic connections between the transistors on the vram chips themselves. The reading in hwinfo/gpu-z is that of the one that is getting the hottest. Mem1-3 are only the surface temps of the vram.


    See my current build here: https://forums.evga.com/My-bench-rig-unlimited-power-m3596024.aspx
    RTX 2080 Ti 4-way SLI?!?!: https://forums.evga.com/RTX-2080-Ti-4way-SLi-set-by-yours-truly-m2954756.aspx
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    HeavyUser
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    Re: RTX 3090 FTW3 memory junction temp overheating 2022/05/05 15:09:16 (permalink)
    pretty sure they sell an after market copper backplate piece for the 3090s, I was going to get one for my 3090 but upgraded to the 3090ti which doesnt have the high memory junction temps. 
    #9
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