Build Advice PCI-Express connectivity question

Good evening fellow Bit Techers.
I am in the process of streamlining my current build.
This is involving removing the LED fan controller and sticking with the NestEQ one I bought from Tru_Gamer, removing some unecessary fans and HDD cages and going 'all SSD' to speed up and cut down on cable clutter. (New 3570 and RAM on the way as well)

One question I have is that the graphics card I have is an Asus GTX 670. It requires 2 6 pin PCI express plugs.
The BE Quiet! PSU has 2 colour coded PCI express outs, both of which have dual 6.8 pin plugs on each lead.
Can I just connect the one lead with the 2 6 pin plugs from one port on the PSU or do I have to connect the two?

Many thanks for any help and assistance offered.
Here are some pics of the old way:-

 

Each 12v rail of that PSU can supply 30amps, so I would suggest one lead will suffice. If it were me though, I'd use 2, as it's not a single rail design, and spreading the load over both rails can only be a good thing... I think. That's probably me being overly cautious though.

 

The sticker on the side of you psu tells you how many amps each one of those sockets can supply. The Asus website should tell you how man amps the card needs. If the sticker shows a greater number of amps than is required by the card you can use the cable.

 

Thanks guys, looks like I can lose a lead from your advice, happy days!

 

I'd normally like to balance the rails out as best as possible but when you consider that the max the card will draw is 170W, and up to 75W of that will be provided via whichever rail the motherboard is on (via the PCIe slot) lets say 50W for arguments sake because it does vary from card to card, then the other 120W will be provided by the 6 pin connectors.

120W/12V=10A, any graphics card connector should be on 16 AWG (American Wire Gauge wire) which can carry 22A, (most of the other cables will be on 18AWG which can only carry 16A) So having both connectors from the same cable won't be a problem and will probably give you better airflow.

 

Thanks federal for the comprehensive reply. I am about to rebuild today as my 3570k has just arrived

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