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new psu the power cable is heating up

post #1 of 8
Thread Starter 
Hi i just purchased a psu today its 580w, i installed it turned on the pc and started using it so i go and start playing games so after and hour or two i decided to give something to my bro on a pendrive and i accidentally touched the psu power cable and i noticed it was hot, so i turnd off the pc switch it to directly to a power outlet, i tun on the pc again and the cable gets warm then when i start playing a game it gets hotter and hotter
its strange this psu is brand new

its a CaseGears Black Steel 580w
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post #2 of 8
The PSU plug is a standard plug.... what is its rating? It should be printed on the cord itself.
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post #3 of 8
Maybe your PSU is exhausting hot air on the cable, thus warming it.
Mighty-iTX
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Mighty-iTX
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post #4 of 8
Thread Starter 
its the whole cable thas getting hot
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post #5 of 8
Here's some basic physics:
- the power consumption depends directly on the Voltage and Current: P=U*I
- losses (heat) depend on the square of the current: Q=R*I², where R is the resistance of the wire there's nothing you can do to change it.

When you start gaming the power draw rises, thus the current rises (I) (as the plug voltage is constant). Since the heat lost depends on the square of the current it will rise even more.

Now depending on your cable, you could have a cable that is rated for a smaller power draw (and higher resistance R) and you reached it's limit. If there's no external source that heats your cable (hot air from the rig), it's likely that's it's at the limit. It could very well melt if the power draw is high enough. I've seen in my college room a cable that even tho it didn't melt, was so hot that it melted the outer plastic isolation and put the room in a cloud of smoke of burned plastic.


*EDIT How did it work with the old PSU? Did you change anything on the rig except the PSU?
Edited by dragosmp - 7/8/08 at 12:06am
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post #6 of 8
Thread Starter 
the cable is band new too i have like 3 cable only tested 2 both do the same i have to test my third one

one of them came with the psu
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post #7 of 8
The PSU may be faulty, it may have a short-circuit that makes it consume more power than it should. Do you have another PSU to test if it heats?
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Centurion
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post #8 of 8
Thread Starter 
nop its the only one i have
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My World
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