What is this jumper for on my new motherboard?

Posted by jasondavis on Super User See other posts from Super User or by jasondavis
Published on 2010-04-14T23:56:11Z Indexed on 2010/04/15 0:03 UTC
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motherboard

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jumpers

I am building a new PC, I just got my motherboard in the mail today. It is a ASRock X58 Extreme 3.

I am reading over the manual for it and one of the jumpers says this.

There is a 3 pin jumper labeled 1 2 3, with pins 1 and 2 shorted by default it is "+5v"

If I manually change it to short jumper pins 2 and 3 instead of 1 and 2 then it will be "+5vSB (standby) for PS/2 or USB wake up events.

So I am confused as to exactly what this is for. Can someone explain what it means, why I would want one other the other?

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