What cause 3 PSU units to burn out in 1 month

July 15, 2011 at 00:22:11
Specs: Windows XP, p4 3.2 ghz/512 mb
my three power supplies demage in one month.

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July 15, 2011 at 04:26:15
Probably because you are using cheap underpowered power supplies that are not capable of doing the job you are asking off them.

Details of these power supplies would probably confirm it.


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July 15, 2011 at 08:49:38
Yep, you're probably buying cheap junk. Post the make/model & wattage of the 3 units you damaged so far.

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July 15, 2011 at 12:50:49
It is also possible that your line voltage is bad in some way. It could be that you have many devices that are affecting the sine wave with harmonics. Those harmonics can lead to higher true rms readings.

It could be that you have miscalculated the load needed for some leg of the psu.

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.

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July 15, 2011 at 20:46:16
1. SWIFT model no HP-450W
2. ATX model no PS- 450W
3. IMAX 550W

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July 15, 2011 at 21:05:48
They appear to be three el-cheapo PSs .

Don't buy an el-cheapo (in quality) PS.
See response 3 in this:

Note - I may have mentioned Cooler Master in that - I have recently found some models have only a 1 year warranty, some are known to have premature fan failures, some are known to develop failing electrolytic capacitors.

If you're using one or more video cards installed in (a) slot(s)........

Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.

If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should get.

El- cheapo power supplies are more likely to
- fail
- damage something else when they fail, often the mboard
- have less current available at +12v
- lie about their current ratings and max total combined power (output) ratings

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July 16, 2011 at 02:56:58
one power supply is burn when computer is on and two of them were burn when computer is not on only cable are in wall socket.in last two i playing a game gta san andrease about tow hour and then after that i shut down the computer.after one or two hour i on the computer but it does not on. the computer electricity cable are in wall socket .please tell that what can i do now.

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July 16, 2011 at 06:55:54
Yep, all 3 are cheap junk. You should be purchasing reputable brand name units like Antec, Corsair, Seasonic, Thermaltake, etc. And you need to know what to look for in the specs - single +12v rail of at least 28A, active PFC, 80% plus efficiency, decent warranty, etc. When it comes to power supplies, you get what you pay for. Open your wallet & buy something decent. For the combined price of the 3 cheap units you've gone thru, you could have gotten one good one & saved yourself a lot of headaches.

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July 16, 2011 at 07:23:48
You may be buying power supplies that don't have enough wattage capacity (max total combined power in watts) and/or not enough amperage at +12v . In that case, they will be damaged in a short time, and they may fail while the computer is running, or after you have used them when the computer is not running when the power supply is still receiving live AC power.
ATX power supplies are always powering the ATX family mboard in some places even when the computer is not running as long as the PS is receiving live AC power.

Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard.

If you have one or more video cards installed in (a) mboard slot(s), tell us their make and model, or at least which video chipset it/they has/have.

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