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Good PSU, but random shutdowns?

Last response: in Components
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May 23, 2011 10:33:33 PM

Hi, I just bought a Corsair 850HX to replace the Corsair 750hx I had previously had in my computer. However, since the installation, my computer randomly shuts down, almost as if power has been abruptly cut off to it. However, right after the fans stop spinning, the PC boots back up again. Could my power supply be the cause, considering how it started only after I installed the new PSU?
May 23, 2011 11:35:05 PM

I just got the corsair 650tx and I have the same problems. I am sending it back to them.
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a b ) Power supply
May 23, 2011 11:45:56 PM

since you didnt have a problem before and that this happened after your upgrade it could have been a faulty piece of hardware.

First make sure plugs are properly connected, retry your old psu to see if it still does give you random shutdowns.
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May 23, 2011 11:48:40 PM

well, see, the thing is that it happens sporadically. It always happens when i play black ops, just not every time i have launched it.
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a b ) Power supply
May 23, 2011 11:52:33 PM

pule said:
well, see, the thing is that it happens sporadically. It always happens when i play black ops, just not every time i have launched it.

did it ever happen when you used your older psu?
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May 23, 2011 11:54:15 PM

I had only had the old psu for around 2 weeks, but no, it never happened with that.
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May 24, 2011 2:22:55 AM

I got a $25 psu tester from frys and it showed low voltage. May need to get one.
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May 24, 2011 2:24:26 AM

See, the thing is, the psu works just fine most of the time! it just intermittently craps out
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a b ) Power supply
May 24, 2011 9:30:05 AM

i think you could try a memtest.
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a c 144 ) Power supply
May 24, 2011 12:52:17 PM

The obvious thing to do is to put the old PSU back in and see if you can repeat the problem.

If the system runs reliably with the old PSU, there is clearly something wrong with the new one.

If you have the same problem with the old PSU, you have something else wrong.

Here is what I think is happening:
A PSU has a circuit that monitors the three main output voltages: 3.3, 5, and 12 volts. When you turn on the computer, the PSU takes a fraction of a second to stabilize. After it does, the PSU sends a control signal called something like "PowerOK" (pin 8, grey wire) to the motherboard. The CPU needs this signal to boot.

System boots, and you are up and running. You load a game or a program that puts a very heavy load on one of the outputs (generally the 12 volts). It drops out of tolerance. You loose the PowerOK signal. That forces a hardware reset. And the system reboots, giving a seemingly random shutdown.

System specs? Why did you upgrade the PSU?
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May 24, 2011 6:16:27 PM

my specs are as follows:

Core i7 2600k @ 4.6GHz and 1.4v
MSI GTX 560 ti Hawk edition @ 1030MHz
8Gb Corsair XMS3 1600MHz RAM @ 1.65v
Asus Sabertooth P67 REV 3 motherboard
Mushkin Callisto Deluxe 120Gb SSD
2x Hitachi 1TB hard drives
7x 120mm fans
CoolerMaster HAF 932

I had a no-brand(XION or something) 700w psu that I stress-tested and destroyed. It was no match for the power draw from my computer. I then upgraded to a Corsair 750HX, which I bought for $140. however, about two weeks after I bought it, I saw a deal for the 850HX for $120, so I RMA'd the 750HX and bought the 850HX, which brings us up to current speed. I am considering just getting an RMA for the 850HX, is that probably the best bet, seeing as this never happened with the previous power supply
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