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Major overheating with Scythe Mugen II

Hi there,

I purchased a Scythe Mugen II CPU cooler and heatsink about 7 months ago and for the most part had no problems with the system and was able to run my CPU (i7 -970 3.2ghz 6 core) at full load using Prime95 with temperatures of only around 41 Degrees C. Recently however my system started hard rebooting due to overheating. I hadn't changed anything inside the system, but my case was old so I decided to re-build the system inside a new case (with 5 Slipstream Kaze Jyuni fans) as well as re-mounting the heatsink and applying new arctic silver thermal paste. I thought this would solve the problem but my system rebooted again today after playing Red Faction Guerilla for all of 45 seconds. When the system had rebooted, I ran Speedfan and found that my CPU temperature was 59C and now having left my system basically idle for an hour, the CPU temp is still 52C! CPU Fan RPM is 1406 (and the others are all 1200+) so its not a broken fan.

Is it possible that having the heatsink screwed on too tight could be causing this problem? I don't know what's wrong or how to fix it. Any help you could give me would be greatly appreciated.

Thank you.
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  1. Best answer
    The heatsink should not be fastened too tight or too loose. From what you describe it could be an intermittent CPU/heatsink problem. 59 degrees is not too hot and if the system reboots it could be due to a momentary spike in temps that RealTemp is not seeing.

    Re-install the CPU/heatsink. This would be the first step. Apply the recommended tightening torque in a cross pattern gradually tightening down.

    If this doesn't solve the problem, look for newly installed software that could be creating this malfunction.
  2. Ok now this is really odd. Speedfan is currently reading my CPU temp as -1C which I know isn't possible. Maybe its not an overheating issue that's causing the reboots, maybe its something wrong with Red Faction... I'll have to play some other games any see what happens.
  3. TorQueMoD said:
    Ok now this is really odd. Speedfan is currently reading my CPU temp as -1C which I know isn't possible. Maybe its not an overheating issue that's causing the reboots, maybe its something wrong with Red Faction... I'll have to play some other games any see what happens.

    Yes please do; and let us know.
  4. Red Faction Guerrilla DEFINITELY crashes the game. Lasted about 10 minutes before a reboot. I told speedfan to log all of the temps and it looks like my GPU could be the problem with the highest temp logged being 73C. But my CPU temp is too low to be reading correctly in this test:

    Seconds CPU HD1 HD3 HD2 GPU
    49801 -0.5 35.0 36.0 37.0 73.0
    49804 -0.5 35.0 36.0 37.0 73.0
    49807 -0.5 35.0 36.0 37.0 73.0
    49810 -0.5 35.0 36.0 37.0 72.0
    49813 -0.5 35.0 36.0 37.0 73.0
    49816 -0.5 35.0 36.0 37.0 73.0
    49819 -0.5 35.0 36.0 37.0 72.0
    49822 -0.5 35.0 36.0 37.0 71.0
    49825 -0.5 35.0 36.0 37.0 73.0
    49828 -0.5 36.0 36.0 37.0 72.0


    Here's a test with Battlefield Bad Company 2. Looks like its reading my CPU temperature properly now and its definitely both the CPU and GPU overheating though you can't quite tell if maybe one is causing the other to overheat.

    Seconds CPU HD1 HD3 HD2 GPU
    59747 72.5 44.0 41.0 43.0 78.0
    59750 73.0 44.0 41.0 43.0 78.0
    59753 73.5 44.0 41.0 43.0 78.0
    59756 70.5 44.0 41.0 43.0 79.0
    59759 72.5 44.0 41.0 43.0 79.0
    59762 74.0 44.0 41.0 43.0 78.0
    59765 73.5 44.0 41.0 43.0 78.0
    59768 73.5 44.0 41.0 43.0 78.0
    59771 73.5 44.0 41.0 43.0 78.0
    59774 73.0 44.0 41.0 43.0 78.0


    And after loosening the heatsink it seems to have made it a bit better... but the GPU is still mega hot.

    Seconds CPU HD1 HD3 HD2 GPU
    64877 64.0 35.0 33.0 37.0 67.0
    64880 66.0 35.0 33.0 37.0 66.0
    64883 62.0 35.0 33.0 37.0 67.0
    64886 60.5 35.0 33.0 37.0 70.0
    64889 57.0 35.0 33.0 37.0 71.0
    64892 54.5 35.0 33.0 37.0 71.0
    64895 54.5 35.0 33.0 37.0 71.0
    64898 54.5 35.0 33.0 37.0 71.0
    64901 59.0 35.0 33.0 37.0 72.0
    64904 60.5 35.0 33.0 37.0 72.0

    Guess I'll have to buy a GPU cooler and see if that helps at all.
  5. Turns out my GPU (Zotac GTX 480 Amp! edition already has a wicked aftermarket cooler but its still overheating like a son of a B so I pulled it from the system and put my old GTX 260 back in and its been stable all week.

    Needless to say I've contacted Zotac support about it.
  6. Best answer selected by TorQueMoD.
  7. This topic has been closed by Mousemonkey
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