Why The 4 Pin Molex is nee3deed?

[Zooker]

I am making a new build Up as Follows:
Antec TruePower 2.0 550 watt
Intel D975XBXLKR Revision 305
E6600 Cpu
NEC 18x DVD Rewrite
Sony 52x CD Rewriter and 16x DVD Reader
Ubiquitous FLOPPY
and Sapphire CrossFire ready 1900GT 16x video Card.
I am making a new build Up as Follows:
Antec TruePower 2.0 550 watt
Intel D975XBXLKR Revision 305
E6600 Cpu
NEC 18x DVD Rewrite
Sony 52x CD Rewriter and 16x DVD Reader
Ubiquitous FLOPPY
and Sapphire CrossFire ready 1900GT 16x video Card.
My question is: On the Intel mother board There is a 4 Pin Power Molex, is it necessary to hook this up? Went to intel's site never got answe!

Zooker

 

[MustISO]

It's AUX power for the PCI-E slot.

 

[Cheex]

There is one on my Foxconn P9657AA-8KS2H as well.

How does this AUX power help the system overall and PCIe specifically (gaming and overclocking)???

 

[Zooker]

Thanks
But my 1 PCI card has a 4 pin connector on it, surely you don't use bothm of them?

Zooker