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I have a 180 Watt,12v PSU in my factory build compaq (sg3440il)PC.Can I replaced it with 450Watt,12vPSU ?

Answers :

Yes you can but why would you want to do this¿ Unless you are adding a bunch of internal peripherals or the Power Supply has died completely the factory build is just fine. If you decide to replace it take it out and check if it is the same size as the one you want to put into the case.
Absolutely, it would be an improvement.
180 Watt is way smaller than I would ever supply.
Just check the physical size of it.
It could be that that is the only one small enough to fit in the case.
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