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Computer restarting when playing video games... who is dead ? GPU ? PSU ? other ?

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September 15, 2013 2:45:45 PM

Hello

My 3 years old computer started to reboot when playing game a week ago. But since yesterday some game are now crashing immediately ( like left4dead2) and some other randomly (like League of legends) . So i run tons of tests i found thanks to this forum.

Spec
CPU: Q6600
GPU: Geforce 9800 GTX+ (latest drivers)
MB: Asus P5Q3
PSU: LC6550
RAm: 2*2gb kingston (not totally sure about the brand)
OS: Win 7

First Temperature check: ok
Then i tried to overload CPU for a long time with stuff like Prime 95, and all went ok.
Then i installed OCCT and made a power supply test who worked fine ! (i was surprised because i was expecting SPU failure)
But then i tried GPU:3D test and maybe half a second after the "donut" appears my computer reboot like in game.

From there i don't know if a chipset on my GPU is dead (i can see the same "donut" from the power suply test) ? or if it just a power shortage (the 3D stuff taking a lot of power?..)

I have also checked the current voltage of my PSU who sounds low:


Thanks for your advice.
a b ) Power supply
September 15, 2013 2:52:28 PM

put some specs please....
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September 15, 2013 3:11:55 PM

u_gonna_squeal_b4_we_cookya said:
Based solely on what information you gave, the GPU is the main suspect. Prime 95 is pretty much all CPU. And it crashed during whatever the GPU test was that you performed. What is causing it? Like the other poster said, we need more info, starting with the system specs, parts, brands, etc. CPU, GPU, PSU, RAM, motherboard, etc. Be as specific as possible.


I hope i gave enough spec.
Concerning OCCT i can run the four test i see (CPU:o CCT; CPU:linpack, GPU:3D and Power Supply) but only GPU:3D made me crash and almost instantly.

I can lower the settings of this test or use DX9 instead of DX11 it will always shut down my computer almost instantly.
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Related resources
a b ) Power supply
September 15, 2013 3:30:36 PM

it look like is the gpu...
did you clean your pc with air?
did you check if the fan on gpu is free of movement...check for dirty
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September 15, 2013 3:40:45 PM

badboyrog said:
it look like is the gpu...
did you clean your pc with air?
did you check if the fan on gpu is free of movement...check for dirty


I've cleaned as best as i could. So it mostly dust free. But since the crashes occurs even at low temperature (like 40° at startup)
i think the issue is somewhere else. (all fans are working properly)

However this summer i had over heating issues because of dust (the computer shut down and was hot, so i cleaned it right away and everything was fine after) so maybe my GPU has been hurt. But it was like 2 or 3 months ago.

I wish i could find a way to be sure it's the GPU. (especially since it's one of the most costly part of the computer :(  )

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September 16, 2013 12:52:37 AM

For info i managed to run a full 3Dmark test without a crash but the GPU 3D test of OCCT is still crashing ... so I'm a bit lost.

I tried to unplugged 1HD and 1 ram stick to lower the PSU load. And it's still crashing instantly.
So i guess i will have to resign to buy a new GPU. I'll prolly do so tomorrow, so any advice or suggestion of testing are still welcome until then.

Edit: The power supply test of OCCT is now crashing which wasn't 12h ago. So if things going worse that fast i'll just wait and see who is completely failing me at some point.

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September 16, 2013 6:50:47 AM

I run another tests of OCCT and sometimes the test start running (and they do well). When it crashes it's only at the very beginning.
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September 16, 2013 6:59:33 AM

u_gonna_squeal_b4_we_cookya said:
I posted a reply yesterday, but it seems to have been removed. I did notice that your PSU is rated at 550w but a search for "LC6550" turned up a review from a German website that reveals this PSU has two 12v rails. From the review and roughly translated to English by Google translate:

"The [LC6550] power supply meets the "ATX12V Power Supply Design Guide" version 2.2 and offers two independent +12 V voltage circuits whose capacity with 16 and 18 amps but remains very modest. With only 318 watts available on the +12 V rail very little power available, the 150 watt weaker be quiet! Straight Power BQT E7-400W puts it, for example, already at 360 watts."

The 550w overall rating is the sum of the 2x +12v rails, the 5v, 3.3v and -12v rails. It is possible that one of the 12v rails has either gone bad or weakened and it is the one powering your GPU while the other 12v rail is working and explains why the rest of your PC functions normally. Once your GPU requires even the slightest amount of power, it shuts down.

The 9800GT requires both of the PCIe power cables. The 9800GT requires "350 Watt or greater power supply with a minimum of 24 amps on the +12 volt rail." according to EVGA. Your +12v rails supply 18 amps and 16 amps and a combined output of 318w. This might have been enough to power it when it was brand new but you need to factor in capacitor aging and the fact that you were over working it for years. This could have caused the PSU to go bad.



Tks a lot for this deep look over my PSU. I'll try to switch the two connectors of the GPU, if i see a different behavior it would prolly means power issues.

Edit: It didn't change anything.
However i took time to see review of my PSU and if was awful, so i think i'll buy a good one and will prolly keep it when i build a new computer.
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September 16, 2013 7:30:58 AM

u_gonna_squeal_b4_we_cookya said:
... also of note, if the motherboard and CPU are powered by one +12v rail and the GPU is powered by the other +12v rail, then when you are not using 3D accelerated apps such as games the motherboard's PCIe slot is actually powering the GPU. When 3D acceleration is happening, the supplemental power from the 2x 6-pin PCIe power cables kick in. This theory would explain your problem. .


Couldn't it be the activation of a defective chipset of my GPU ? It could lead to the same conclusion isn t it ?
Anyway i'll try a new good PSU. i'll keep you and the forum posted.
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September 17, 2013 8:33:51 AM

It was indeed the PSU ! I have no more crash with OCCT :) 
I bought a corsair CX600 it sounds perfect atm.

Cheerz and many thanks for your support.
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!