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Computer shuts off at random after an upgrade


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#1 Atpass

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Posted 03 January 2013 - 11:11 PM

Hello everyone.

First time posting, and I apologize for going straight to the new topic button, but I needed some help and this forums seemed as good a place as any to ask.

Here is my Speccy sheet so you have an idea of my system information:

http://speccy.piriform.com/results/sWvmfibC7WivniA1T0o5VUv


Recently I got a new GPU, a NVIDIA GeForce GTX 660 Ti. My power supply was older and did not have enough amperage along the +12 volt rail to run the new card, so I got a new power supply as well; it is a Corsair VX550W power supply, model is CMPSU-550VX.

Got both pieces of hardware installed and they ran for about a day with no issues. Today, however, the computer shut down randomly without warning. There was no BSOD, it simply shut off (and then began to start up again). I was browsing a website at the time although I had recently been playing a game.

I opened the box and touched the components to feel for heat. Neither the GPU nor the power supply were warm to the touch. My main hard drive was a little warm, and I did have to reposition it in the case to fit the GPU in.

I installed and ran Speedfan for a while while I played another game, to see if things were overheating. The GPU got to about 52 degrees C, everything else was lower then that.

The computer shut off twice more over the course of the day, every time while I was doing something non-system intensive.

So, there's the backstory. My questions are as follows:

1. I did my best to check the PSU against the GPU to make sure it could run it. Is the power supply insufficient? All requirements seem to be met...but do I need more power then 550 W to run the rest of my computer (after the 450 from the card is taken)? If so, what should I go up to? 600? 750?

2. The GTX 660 has two auxiliary power cords coming from the side of the card, I had them both plugged into the power supply, do I need them both or just the one?

3. Could it be an overheating issue? I have about five fans in the case at the moment (GPU fan, motherboard fan, PSU fan, two extra fans) and a air intake in the side of the case, surely this is enough?

Thanks for any help you can offer.

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#2 Jan Benedict

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Posted 04 January 2013 - 09:41 AM

Unlikely to be an overheating issue as 52 degrees is hardly overheating on a 660Ti.. Yes you need both 6 pin power connectors plugged in the GPU, it's a 6 pin right? And if you're gonna upgrade your PSU, then yes better safe than sorry go for the 750W or 800W with a good and reliable manufacturer i.e. Seasonic, XFX, and some Corsair and Cooler Master PSUs..

#3 Atpass

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Posted 04 January 2013 - 02:20 PM

So it could be just not enough power?

Well, that seems to match up with my testing, I have been running with my old GPU and the new power supply and no issues so far, so it shouldn't be a defective PSU.

But my question is, if the 550 W is insufficient, why did my computer even turn on, much less run for a day and a half?




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