ATX Front Panel Connector -What is Pin-9 5-volts?

Posted on 2012-08-18
Last Modified: 2012-08-20
This deals with the Front Panel Connector
Intel DZ68DB motherboard..
CM Storm case

Connector on motherboard has 9 pins. I understand the connections from the case to pins 1-8. Those handle HD LED, reset switch, Power LED, an on/off switch.

But what is pin-9? It says Power 5 volts. What connects to pin-9? Is it a lead from the power supply? From the case? I don't see anything coming from the case. Seems like it should be simple, but I'm stumped. Thanks.
Question by:Elliot123
    LVL 33

    Assisted Solution

    According to this, it is Not Connected. (cursor over #7)

    I haven't seen a 5v line used in a long time. And if I remember correctly, it was used to run a front panel "display".

    If you have a voltmeter handy, you can check if it does have 5v coming out of it.
    I'm kind of curious.   : )
    LVL 47

    Assisted Solution

    Interesting question

    Front Panel I/O document and on page 18 describes the pin as reserved but it looks like that 5 volts is available there.

    Page 44 of the manual for the motherboard show that there is +5 volts there.  See the box labelled G.  Also see Page 47.

    You don't supply the voltage.  It comes from the motherboard and is available for some device.
    LVL 70

    Accepted Solution

    "... I haven't seen a 5v line used in a long time ..."  ==>  Actually 5v is one of the main rails on your power supply and is used by a lot of devices in modern PCs.   -5v is a different story ... that's essentially obsolete (not even provided on many new PSUs) ... but that's not what that pin provides.

    Nevertheless, as noted above, the +5v on pin=9 is simply "there" for the taking -- but most chassis setups don't have any need for it, so there won't be any connection to it.    It's simply provided so there's a convenient source of +5v if needed for your specific chassis -- it could drive an LED; be used for a CFL display panel; etc.

    ... but I see nothing in the CM Storm manual that would require this pin.
    LVL 33

    Expert Comment

    >> Actually 5v is one of the main rails on your power supply...

    Sloppy reply on my part.
    I meant something run off voltage from the front panel header.   {sheepish grin}

    Author Comment

    Well, I assembled the computer with nothing on pin-9 and it works fine.  I wasn't sure about the pin, and the 5 volts concerned me. So I thank you folks for the advice.
    LVL 33

    Expert Comment

    Thanks for the feedback and the Points.    : )

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