P2 power supply connector?

[kdkrone]

I was going to put my first system together today; I have a new In-Win case and the power supply has not only an ATX connector labeled P1, but it also has a P2 connector with 6 wires.

I would be grateful if someone could tell me what this is for.

Thanks,
Ken

 

[Dre]

Maybe it's an AT power connector?

 

[toshiba3020]

Its for server boards.