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Thread: Mobo at 40C and rising

  1. #1
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    Mobo at 40C and rising

    Hi a mates just built a PC with:
    AMD A2 4600+ (Stock fsb and heatsink)
    Asus M2N4 Sli

    Booting to bios with case side off:
    CPU: 46C-48C
    Mobo: 35C climbing when PC underload to around 50C

    At the moment he can't even install Windows on it as the PC is cutting out as soon the mobo reaches 50C.

    Any possible suggestions as to why this is happening? The rest of the case seems fine and yes the heatsink for the CPU is on properly.

  2. #2
    No-one's Fanboi Thorsson's Avatar
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    • Thorsson's system
      • Motherboard:
      • ASUS P8Z77-V PRO
      • CPU:
      • i5 3570k
      • Memory:
      • 2x8Gb Corsair Vengeance PC1866
      • Storage:
      • 256M4 SSD; 2Tb 7200RPM Barracuda; 2Tb Linkstation
      • Graphics card(s):
      • EVGA GTX970 SC
      • PSU:
      • Corsair HX650
      • Case:
      • Antec 300
      • Operating System:
      • Win10 64
      • Monitor(s):
      • Dell 2515H
      • Internet:
      • Fibre Optic 30Mb
    I presume it is the northbridge chipset that is overheating. Is it passive cooled or have a fan? If the latter is the fan working? Is it obstructed (e.g. by an over-long video card)?

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    Quote Originally Posted by Thorsson View Post
    I presume it is the northbridge chipset that is overheating. Is it passive cooled or have a fan? If the latter is the fan working? Is it obstructed (e.g. by an over-long video card)?
    Its passively cooled. The plan this weekend is to boot the comp outside the case just to discount the case as a possible cause of the overheating.

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    No-one's Fanboi Thorsson's Avatar
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    • Thorsson's system
      • Motherboard:
      • ASUS P8Z77-V PRO
      • CPU:
      • i5 3570k
      • Memory:
      • 2x8Gb Corsair Vengeance PC1866
      • Storage:
      • 256M4 SSD; 2Tb 7200RPM Barracuda; 2Tb Linkstation
      • Graphics card(s):
      • EVGA GTX970 SC
      • PSU:
      • Corsair HX650
      • Case:
      • Antec 300
      • Operating System:
      • Win10 64
      • Monitor(s):
      • Dell 2515H
      • Internet:
      • Fibre Optic 30Mb
    It won't be the case in general, so much as airflow over the passive cooler. Don't know the mobo, but I do know that overheating NBs is often a cause for instability and a definite limiter on OCing. You might try enhancing the cooling.

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    Just buy an active cooling hsf for the NB and ditch the passive one.

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    • aidanjt's system
      • Motherboard:
      • Asus Strix Z370-G
      • CPU:
      • Intel i7-8700K
      • Memory:
      • 2x8GB Corsiar LPX 3000C15
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      • Graphics card(s):
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    You shouldn't have to actively cool motherboard ICs if the case has a decent thermal flow. Thankfully Zalman proved that and we got rid of the annoying ass NB fans that sounded like scalextrix cars going 100mph.
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    I know that he shouldnt, but the airflow is obviously very poor in the case. Its either add an NB fan or rethink the case/wiring layout and buy some more case fans!

    The only other thing, although very unlikely is that the BIOS temp readings are incorrect and its shutting down. You can probably turn the NB thermal monitor off to stop it shutting down, but I wouldnt recommend it unless you're absolutely sure its wrong.

    Is the NB hot to touch around the time it shuts down?

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    • Magnets's system
      • Motherboard:
      • Gigabyte P35 DS3p
      • CPU:
      • E6420
      • Memory:
      • Corsair XMS2 5400 C4 (2gb)
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    50 degrees northbridge isn't really that hot, is it?

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    Quote Originally Posted by Magnets View Post
    50 degrees northbridge isn't really that hot, is it?
    Considering that's underload, and passively cooled, I agree.
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    • amjedm's system
      • Motherboard:
      • Asus A8N-Sli Premium
      • CPU:
      • Athlon X2 4200 S939 + Scythe Ninja rev A
      • Memory:
      • 2GB Corsair DDR PC3200
      • Storage:
      • Samsung T 160GB Sata in Scythe Quiet Box
      • Graphics card(s):
      • Nvidia 6600 256MB + Cooling Mod
      • PSU:
      • Enermax Noisetaker 485 (fanless) - lower chamber P180 fan doing the PSU cooling
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    I'm sure the northbridge on my S939 Asus mobo averages around 40 (computer has been switched off for several weeks) if not higher and I didn't think that was a problem.

  11. #11
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    • Magnets's system
      • Motherboard:
      • Gigabyte P35 DS3p
      • CPU:
      • E6420
      • Memory:
      • Corsair XMS2 5400 C4 (2gb)
      • Storage:
      • Seagate 7200.10 320gb *2
      • Graphics card(s):
      • Sapphire x1950xt
      • PSU:
      • Corsair hx520
      • Case:
      • Lian li PC-7 + II
      • Monitor(s):
      • Viewsonic VP930
      • Internet:
      • Zen
    Quote Originally Posted by amjedm View Post
    I'm sure the northbridge on my S939 Asus mobo averages around 40 (computer has been switched off for several weeks) if not higher and I didn't think that was a problem.
    Mine idles at 41 degrees, not sure what it is under load. When i turn it off, and touch the heatsink it's pretty damn hot.

  12. #12
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    Sorry I don't think I have made my self clear.

    These temperatures are all from cold to bios only, when I talk about "load" I'm talking about installing Windows on it which I haven't been able to do. Its an issue because it takes about 1min to get to the bios from power on which is wrong, all I'm wondering is it a broken mobo causing the heating slowness and heat or just a case heating issue?

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