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2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU)

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moosedoctor
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2017/05/19 13:25:45 (permalink)
#1 = ASUS M5A78L-M PLUS/USB3 AM3+
#2 (last night) = ASUS 970 PRO GAMING/AURA AM3+

Facts= 
#1 was not an overclocker dream board, although it had ASUS' great BIOS and loadline calibration settings along with three or four temperature sensors including CPU, NB, SB, and another one

#2 replaced #1 after its 4-pin CPU power connector melted and fused itself to the motherboard. Since I didn't know if it was the PSU's or MB's fault, I used the #1 PSU for parts and started an RMA with ASUS. #2 mobo has an 8-pin CPU power connector and is actually designed for overclocking.  Powered by EVGA 600W PSU.


Meltdown=
#1 was rigged with my FX6300 and 8GB DDR3, 500W Coolmax PSU, plenty of cooling, never let anything get >60 Degrees Celcius. I was able to overclock the 6300 from stock 3.5GHZz to 4.2GHz with my water cooler and plenty of air flow through the case. On board graphics. This was the machine I used downstairs to stream games from my "good" machine upstairs via Steam Home Streaming. One day the four pin plug melted into the motherboard. 

#2 (still) has an FX8350 overclocked from 4.2 to 4.4, sometimes 4.55, no more. Prime95'd for at least 12 hours. Vengeance LP DDR3 2x8GB @ 1.8GHz, 1.5V, 10-11-10-30 (manufacturer's settings). M.2 C drive, SATA III SSD D drive, SATA II E drive (2x 1TB HDD RAID 0). Water cooled CPU idles around 12 degrees Celcius. Never seen it go above 55. NB runs hot (up to 60 even with dual fan cooling directed at NB and SB power phase passive cooled heatsinks).
GPU=EVGA 1070SC; Precision XOC for Pascal, latest and greatest drivers and Precision XOC. Max stable overclock= 112% Power, Temp Target set to 92 deg C and prioritized, Voltage bar set to max, GPU clock offset +70, Memory clock offset +700, custom fan profile to keep 40C>GPU<60C.
PSU= EVGA 600W
Last night the eight-pin CPU connector melted the plastic around 3 out of 8 pins. I cleaned it out and now it's working again, but I've downclocked it to stock, turned Turbo back on, etc. Still unsure why these pins keep melting when I keep the sensor temperatures at a very reasonable range. Anyone have any ideas? Really, throw any ideas you have. At the moment I have a fan directly pointed at the 8-pin connector just in case.

ps. #2's loadline calibration settings were set to either extreme or ultra, or the setting that was one below the highest preset. I set the CPU temp limit to 130 or 140, knowing that it would never reach that with my cooling setup. Same idea as the GPU temperature target - higher you set, higher voltage and/or more power gets pushed to the CPU - REGULATED BY LOADLINE CALIBRATION - but I don't think anyone thought about putting some sunscreen on the CPU power connector.

Your comments, questions, or concerns would be much appreciated.
Eren
 
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post edited by Sajin - 2017/05/19 14:22:42

FX8350 (stable<4,700 Ghz) | FX6300 (stable<4,664GHz) | MSI 990FXA Gaming Board | ASUS 970 Pro Gaming/Aura Board | EVGA 1070SC | 2 x 8GB Corsair Vengeance LP 1,866Mhz (stable 2,094MHz) | Corsair H55 Water Cooler | EVGA 600 PSU | Intel M.2, Micron SSD
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    bcavnaugh
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/19 14:59:56 (permalink)
    Any Photos?
     
    This was caused by using an under powered PSU, a 600Watt PSU when it should have been at least an 850 Watt PSU.
    This is NOT an EVGA PSU
    post edited by bcavnaugh - 2017/05/19 15:06:28

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    #2
    moosedoctor
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/20 15:27:54 (permalink)
    I was about to post photos but I don't think there's a need for that any more.  In both cases the PSU plug looked exactly the same.  I wanted to find out whether:
     
    1. ON THE BOARD= Male center piece inside the female part gets too hot and heats up the PSU plug & melts the plastic, the piece I call the condom
    or
    2. The PSU plug heats up on its own and melts the condom. Has nothing to do with the motherboard, GPU, CPU, wherever it's connected to.
    post edited by moosedoctor - 2017/05/20 15:30:06

    FX8350 (stable<4,700 Ghz) | FX6300 (stable<4,664GHz) | MSI 990FXA Gaming Board | ASUS 970 Pro Gaming/Aura Board | EVGA 1070SC | 2 x 8GB Corsair Vengeance LP 1,866Mhz (stable 2,094MHz) | Corsair H55 Water Cooler | EVGA 600 PSU | Intel M.2, Micron SSD
    #3
    bcavnaugh
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/20 15:57:15 (permalink)
    With what you are saying you should post photos of the condom melted to get a better idea.

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    moosedoctor
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/20 19:01:20 (permalink)
    Certainly.
     

     
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    #5
    bcavnaugh
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/20 19:19:42 (permalink)
    I would say best look at a 750 or even 850 PSU, 600 may be to small.
    I would look well on the back side of the Motherboard as well, extra stand offs as well.
    Test your Wall Socket and make sure the Ground is Ground and Polarity is correct.
    post edited by bcavnaugh - 2017/05/20 19:23:33

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    quadlatte
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/24 12:42:30 (permalink)
    definitely pulling to much on that line, as im sure you know electricity creates heat, the more you add the more heat you will get. sounds like the board is pulling more current than those connectors are designed for, which is worrisome that the psu would provide enough to pass the thermal rating of the connector. a higher rated psu may prevent this but if the connector can not handle the increased thermal load of the power then the same thing can happen again. all electrical connectors should have a load and temperature rating and the correct one used. i would contact evga about this so they are aware, even if they dont warranty it at least they will know this could be a issue.

                                   
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    #7
    j2345912
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/25 09:50:27 (permalink)
    Man that's some scary stuff. I wonder if your LLC setting is just asking too much of your power supply. I think quadlatte has a good theory there.

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    #8
    wmmills
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/25 10:55:43 (permalink)
    To the OP, you wouldn't by any chance be putting "cheater" wires in the back of the plugs to power other things are you?! Heat makes resistance and resistance makes more heat.... and around and around you go till you melt your plugs off.  :)

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    Vlada011
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/26 05:00:51 (permalink)
    GTX1070 deserve at least gold standard 650W PSU.
    With Intel Xtreme or AMD Bulldozer/Vishera I would go on 750W at least.
    Overclocked Bulldozer need more power than most graphic cards. 
    He need in idle more than i7 and 1800X. 


    #10
    quadlatte
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/26 08:54:04 (permalink)
    j2345912
    Man that's some scary stuff. I wonder if your LLC setting is just asking too much of your power supply. I think quadlatte has a good theory there.


    thats beyond scary, it's down right dangerous. that could just as easily caught fire, the plastic composite should be rated to not do this. this tells me that either the plug is crap, the PSU is bad or the board is bad (in which case the overload protection should have kicked in on the psu )

                                   
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    bcavnaugh
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/26 09:31:28 (permalink)
    @ moosedoctor Any updates?

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    #12
    Cool GTX
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/26 10:29:40 (permalink)
    moosedoctor

    ps. #2's loadline calibration settings were set to either extreme or ultra, or the setting that was one below the highest preset. I set the CPU temp limit to 130 or 140, knowing that it would never reach that with my cooling setup. Same idea as the GPU temperature target - higher you set, higher voltage and/or more power gets pushed to the CPU - REGULATED BY LOADLINE CALIBRATION - but I don't think anyone thought about putting some sunscreen on the CPU power connector.



    Not sure how safe that CPU Temp, 130-140 setting is.  You may want to ask Asus if that could be a root cause of the issue.
     
    Something else to consider:
     
    A loose electrical fitting will get much hotter than a tight fitting. 
     
    So, if there is not good contact between pins and socket, resistance is increased = hot spot
     

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    Carbonshape
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/27 12:50:07 (permalink)
    I'm glad you survived.

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    Sajin
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    Re: 2nd ASUS Motherboard CPU power connector meltdown (EVGA PSU, GPU) 2017/05/27 13:44:32 (permalink)
    Gotta love those cheap power supplies.


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