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what is this?

Go to solution Solved by NumLock21,

It's for Wake on Lan

Very old ancient motherboards needs to use it for the wake on lan feature where the board also has the same 3 pin header. Newer boards of today don't need it.

 

2 minutes ago, MrWalex said:

the 3 pin connector on top

IDK. Maybe it's for a fan? 

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It looks similar to a fan header but that would be a weird place for one. it might also be where a battery pack plugs in. One of my raid cards had a little battery pack to help the raid card finish its job should the computer ever lose power suddenly

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usually there's something printed around stuff like that, might help to identify it

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