Taj PG signal koliko vidim na netu je Power Good signal i to ploca upali onda kada vidi da nema dovoljno napajanja.
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The Power Good signal prevents a computer from attempting to operate on improper voltages and damaging itself by alerting it to improper power supply.
The ATX specification defines the Power-Good signal as a +5 volt (V) signal generated in the power supply when it has passed its internal self-tests and the outputs have stabilized. This normally takes between 0.1 and 0.5 seconds after the power supply is switched on. The signal is then sent to the motherboard, where it is received by the processor timer chip that controls the reset line to the processor.
Cheaper and/or lower quality power supplies do not follow the ATX specification of a separate monitoring circuit; they instead wire the power good output to one of the 5 V lines. This means the processor will never reset given bad power unless the 5 V line drops low enough to turn off the trigger, which could be too low for proper operation.
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Ukratko ploca nece da se pokrene jer joj ne odgovara napajanje.
Neke liste kompatibilnih napajanja
http://www.msi.com/file/test_report/TR7_3266.pdf
i
http://www.msi.com/file/test_report/TR7_3429.pdf