PC Turns off while gaming - not overheating

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Grega Menih

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Aug 22, 2014
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So, about 2 weeks ago I build my own PC, with these parts:


  • CPU: AMD FX 6300
    PSU: Corsair CX 430
    GPU: MSI GTX 750 Ti
    RAM: 2x Ballistix 4GB
    Mobo: Asus M5A78L-M

At first, the PC would shut down any time I tried to use anything 3D (games, Kombuster...). It happened instantly, but it didn't shut off completely - the fans kept running, but the screen went offline until I turned the PC off, and on again. When I checked the Event Viewer, it sat there was a crucial error with Kernel-Power, Task 41, event 63. I googled it and it told me it could be a faulty PSU.

A friend lent me his old LC power 550W PSU (LC6550 V2.2) that he didn't use anymore, so I installed it. I can now run everything, but it's limited - if I set the graphics too high and run the game for a long time, the same thing happens. If I have the GPU at about 65°C for 15 minutes it shuts off, but if I have it at 58°C, I get no errors.

What could be causing this? Is it possible the current PSU is bad as well? Or is something else broken?
 
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Tradesman1

Tradesman1

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Jun 5, 2013
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Sounds like your PSU may be slightly shy voltage wise, it's rated 430 Peak, you want 400 or so and this one is rated to about 380 on the 12 volt rail....moving on to the other PSU which seems OK, sounds like the card itself may have a problems if effectively overheating at 65, these shouldn't throttle till about 80 or so
 
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Grega Menih

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Aug 22, 2014
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Yes, a lot of people told me I should replace the PSU, because my problem seemed very PSU-related. So I did, and the GPU worked after replacing it, but I don't understand why it would stop working at 65°C. I just ran OCCT, and it shut off at exactly 65°C.

I've emailed the seller about the faulty GPU when the problem first appeared, but they told me it's probably a PSU problem. I told them they were correct after getting the GPU running with the new PSU.
 
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Eximo

Eximo

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May 27, 2010
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Warmer the GPU gets the more power the VRMs, RAM, and GPU itself are going to need. Sounds like you are still borderline. Still only 450W on the 12V rail for the LC6550 and it didn't review very well in terms of quality of construction.

Also make sure to check CPU temperature. FX6300 shouldn't be exceeding ~60C.

750Ti is a low power part, but it is supplied through the motherboard rather then a cable directly from the power supply. Might be a faulty motherboard with power issues.
 
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Grega Menih

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Aug 22, 2014
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The PSU is used as well. And the CPU is running low 50s.

If it's a faulty motherboard, why did I have problems with my previous PSU? I've already sent the PSU back to the seller, and I'm waiting to select a new one.

 
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maddogfargo

maddogfargo

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Nov 28, 2006
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As heat increases efficiency decreases. So as the PSU heats up the ability to deliver rated power drops.

If it is near it's limit and your system is drawing near max from it when it is cool, it will power off when it gets hot.

Google this:

Extreme Power Supply Calculator

It is FREE to use for PERSONAL use. But you need to put in ALL your computer compunents, include any voltage and overclocking tweaks, and see what power rating it says is the minimum -vs- recommended.
 
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Grega Menih

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Aug 22, 2014
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I've tried that. It told me that my Corsair CX 430 is enough for my build, but apparently, it wasn't. This PSU is working, but fails (or something else fails) when the GPU gets to 65°C. I've sent the Corsair CX 430 back for replacement... I'm considering not getting anything back, until I know that this PSU is faulty/insufficient as well.
 
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lordjakian

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Feb 19, 2010
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PSU have a chance of degrading over time, depending on quality of the power supply and how heavily the pc is used. Because of the random kind of issues that can occur with borderline power issues, i will buy a power supply that is rated atleast 100 watts over what I need, so as to be safe. Also have to pay attention to how it divvys up the power,(some power supply have seperate rails and such) as that can affect the performance, especially with power hungry graphic cards.

That said.....the last time I thought it was an issue with a borderline powersupply,(brothers computer) I pulled the graphics card out and put it in a different computer,(My own) and it turned out the graphics card was the issue. Even after reapplying thermal paste to the heatsink to the gpu it still showed the same problem.....
 
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