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New PSU and my comp randomly shuts off -- please help a new builder

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August 22, 2013 4:35:06 PM

Hi all,

I'm going for a silent build and a just installed my Seasonic 400w Fanless PSU.

First few hours worked great.

Then I leave for the bathroom and come back and the computer is mysterious turned off. I click the on button again and it boots for 5 seconds and then fails.

I've been assured by many that 400w is plenty for my i5-4670k and GTX 660 (no OCing, no SLI).

Should I RMA it? It's soooo crappy when you have to this with a PSU. I wonder if I can keep all the cables routed and just swap the PSUs. (yay for modular).

Also, if my comp randomly turns off, do I need to run some software diagnosis?
August 22, 2013 4:38:19 PM

My comp is now back and up in running. I smeleld the PSU and no hint of smoke or anything.

Should I RMA it? Should I not be running my comp right now? It would be tough not too...only device with internet in my house.
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August 22, 2013 4:46:22 PM

You need to step up to at least 600w PSU .You don't have enough power.
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August 22, 2013 5:01:25 PM

380 is too close to the max. You need a little headroom - especially with a fan-less.
-Bruce
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August 22, 2013 5:05:52 PM

SR-71 Blackbird said:
You need to step up to at least 600w PSU .You don't have enough power.


Blackbird, you were the very person in the other thread of mine that said it would work, no problem at all. I can up the wattage, I guess.
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August 22, 2013 5:16:56 PM

I missread your other post , should be higher , I thought that Fanless was a 500w.I apologize.
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August 22, 2013 5:35:29 PM

Can some other ppl weigh in on this?

Is it a defective unit or not enough wattage?
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Best solution

August 23, 2013 5:21:50 AM

380 is very close to the max. Max does not mean sustained output - ratings decrease as temps increase. I like to double any power supply requirements I need - whether it is an electronic circuit I design or computer I build.
Edit - overkill yes - problems - NO.
Just think if you had to put out max effort - I think you would get very hot and then your output would go down. Can you monitor your psu temps?
-Bruce
BTW I am an electronic technologist - last 30 years.
You have to look at the derating curves for your psu to get a good grasp of how much wattage will be needed.
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