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  Reply # 947404 8-Dec-2013 11:53
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Whatever power supply you get, make sure it is one that is built as a large 12V only one with internal stepdowns for the 5V and 3.3V outputs. Alot of PSUs out there are designed with the transformer having different tappings for each voltage output. The problem with that type is you need to keep the same % loading on the 12V 5V and 3.3V outputs. If you don't the voltages start to vary. And if they vary enough the monitoring circuit will detect that and shutdown / restart the computer.


If you want to test this for yourself. Get a supply that uses the transformer tapping design. Connect the PS_ON wire to ground to make it switch on without it being plugged into a motherboard. Then use a car headlight lamp to apply a load to each of the voltage rails while you monitor the voltage on the other rails. Just don't try connecting the lamp to the 5V standby or the Neg 12V outputs.



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  Reply # 947418 8-Dec-2013 12:30
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Aredwood: Whatever power supply you get, make sure it is one that is built as a large 12V only one with internal stepdowns for the 5V and 3.3V outputs. Alot of PSUs out there are designed with the transformer having different tappings for each voltage output. The problem with that type is you need to keep the same % loading on the 12V 5V and 3.3V outputs. If you don't the voltages start to vary. And if they vary enough the monitoring circuit will detect that and shutdown / restart the computer.


If you want to test this for yourself. Get a supply that uses the transformer tapping design. Connect the PS_ON wire to ground to make it switch on without it being plugged into a motherboard. Then use a car headlight lamp to apply a load to each of the voltage rails while you monitor the voltage on the other rails. Just don't try connecting the lamp to the 5V standby or the Neg 12V outputs.


that makes a lot of sense, i took it to a computer place yesterday and from what he said, my 12v output was well in arrears of what my12v fans etc was pulling, its a 550w supply but the 12v output is lacking? its an atx12v api4pc24



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