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A comment on How to programmatically find out if computer is on. Parent comment
https://en.wikipedia.org/wiki/PCI_Express#Pinout
The main difference is that WAKE# signal only restores power to the system but it does not change the system's power state, after using it the card needs to send an interrupt to the motherboard to properly wake it up. Power button does both things.
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https://en.wikipedia.org/wiki/PCI_Express#Pinout
The main difference is that WAKE# signal only restores power to the system but it does not change the system's power state, after using it the card needs to send an interrupt to the motherboard to properly wake it up. Power button does both things.