burning smell from power supply

January 7, 2010 at 13:20:06
Specs: Windows XP Pro 64-bit
I have a tower set up with 2 small fans, one big fan, intel duo core processor, and 8 gigs of ram. with this ocz technology processor. I use my computer for mainly designing and artwork.
I had this set up for about 8 months, Upgraded from old setup, with new motherboard and powersupply.

Today I smelled a burning smell as my computer was running. It ran fine and was working for awhile, then I finally figured out it was my computer, more specifically my power supply. I unplugged it once and clean out all the fans because I thought it may have been a fan getting clogged up from dust. Then I smelled it again and was stronger smell. I unplugged it and looked inside and noticed a little smoke and the smell coming from the power supply. Do I just need to scrap this power supply and buy a new one? It seems like a short lifespan for it.

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January 7, 2010 at 13:24:50
Definitely stop using it immediately before it damages other hardware.

Post the model of the PSU (power supply unit) along with the other components. OCZ don't make processors. They are a RAM reseller.

In order to help with the selection of a new PSU we need to know these specs. The exact model of your graphics card is important, as is the CPU.

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January 7, 2010 at 14:06:25
whoops i didnt mean processor.. my bad (i meant power supply)

-the model of the power supply is OCZ700SXS ..
-gigabyte motherboard (not sure on the model it says on it : gigabit lan, sata 2, usb 2.0 , vrd 11.1, 45nm CPU)
-intel duo core processor
-not sure of the brand of RAM but 8 gigs.
- video card : HIS HD 3870 IceQ 3 Turbo

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January 7, 2010 at 14:23:40
That is a decent brand and size PSU. The problem is the 4 12V rails are all rated at 18A each. It is possible to overload one or more of those rails while not using one at all.

The trend is to return to single 12V rail with enough amps for everything. I notice that newegg.com has your PSU on sale right now. the reason is what I just stated.

It is possible to use that type of PSU safely if you load the rails evenly. One rail is used for the CPU connector. Two others have PCIe connectors and the last one is for drives, etc.

If your graphics card draws more than 18A then you can't use that PSU at all.

Your graphics card pulls 186watts under power. That comes out to 15.5A @12V. If you are overclocking or that model is hopped up you may be exceeding the 18A available.

Best to replace with a single rail PSU is you can. You present PSU should still be under warranty so you will need to deal with that too.

PSUs will fail faster when running hotter too. If you look at the specs they mention temperatures. The efficiency falls off when hotter.

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January 7, 2010 at 15:18:41
thanks for the advice!

i was looking at Newegg for some different models of OCZ ...

would you suggest something like this model?

OCZ700FTY it has the single 12V rail and looks like the output has more amps... I am not as tech savvy on this, but my roomate is more so. So I'll have him read your advice and help me pick out a new one.


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January 7, 2010 at 15:55:54
Did you read the first negative review of that unit. Seems like there is a problem with the design that trip arc fault circuit breakers. Any PSU that has the frequency rating at 47/63 or so may do that.

Look at the Corsair unit linked below. Has 50/60 Hz specs. Single 12V rail with 52A. Corsair has been voted the best power supply in the past.


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