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Corsair 750TX Power Supply Related Issue

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April 23, 2009 1:16:24 PM

So I recently upgraded from a 450w PSU to a 750w PSU. The supply I ugraded to is this one - http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006.

The issue I'm having is after about 4 or 5 hours of idling my PC shuts off. I checked the voltages and temps after installation and everything looked good. Is it possible I'm getting a slow heat build up in the PSU over 4 or 5 hours? Or maybe a voltage problem over that period of time?

One of the times it shut off while I was at work. When I came home I had to reset the PSU (cycle the power switch) to get the PC to turn on again.

I have no idea what is causing this.
April 23, 2009 1:23:34 PM

System info is -

Asus P5N-D
Intel Core2 Quad Q9450
8.0GB Corsair DDR2 800
Nvidia 9800GTX

I also installed an additional 4GB of RAM shortly before installing the PSU. Not sure if that could possibly be causing an issue. I tend to lean towards the PSU.
a b ) Power supply
April 23, 2009 5:43:47 PM

Run Memtest86+ overnight to rule out the RAM.
Related resources
April 23, 2009 5:45:46 PM

theAnimal said:
Run Memtest86+ overnight to rule out the RAM.


I'll do that tonight and post the results.
April 23, 2009 9:48:40 PM

Hmm, the Corsair's are very reliable supplies, but noone can be perfect. Run the memtest as recommended and if that passes, RMA the PSU.
April 23, 2009 10:13:34 PM

Ok, I've got some further info. It's definitely something with PSU. When I came home from work today the PC was still on, but it was frozen. I cycled it got a h/w monitor error on boot. Went into the setup and I was only getting about 9.7V from my 12V. All other voltages are fine.

I turned it off, checked the 12V connector and fired it back up. I went into setup and the 12V said was at 11.5V and from there is began to slowly drop. It's been about 20 minutes now and I'm down to 10.49V.
April 23, 2009 10:25:59 PM

I pulled the two recently installed ram sticks and I'm still seeing the same slow voltage drop.
a c 696 ) Power supply
April 23, 2009 10:30:15 PM

It looks like one got through quality control. RMA
April 23, 2009 10:34:29 PM

Damn, all that time prettying up the cables. I'm going to see what the Corsair guys have to say and then it's probably going to be RMA'd. Thanks.
April 23, 2009 10:40:54 PM

Yea, ive recently adoped a new policy of running all new systems/parts outside of my case for 48 hours+. Nothing is more fustrating than spending 3 hours making your PC perfect to find out your new mobo was DOA.
a b ) Power supply
April 24, 2009 2:04:11 AM

delatoper8or said:
Ok, I've got some further info. It's definitely something with PSU. When I came home from work today the PC was still on, but it was frozen. I cycled it got a h/w monitor error on boot. Went into the setup and I was only getting about 9.7V from my 12V. All other voltages are fine.

I turned it off, checked the 12V connector and fired it back up. I went into setup and the 12V said was at 11.5V and from there is began to slowly drop. It's been about 20 minutes now and I'm down to 10.49V.


Software readings are unreliable. Use a DMM to measure.
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