Power Supply Cables to a GTX 780 Classified Easy Question

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Bassereus

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I have lots of computer things spread out on the dining room table and I have come to the point where I have to install my GTX 780 Classified.

The card itself has two 8 pin sockets. Now the power supply I am using is a Corsair RM 650, it comes with 2x PCI-E wires (8 pin plugs going to 2x 6+2pin PCI-E plugs). I don't know how to wire it up to my graphics card. Can I use just the one cable? Do I need to connect both cables to the card? Is there a a risk of cooking my Graphics card by connecting too much power to it, or perhaps by connecting too little?

Fast answers would be greatly appreciated!

Cheers,

Dan
 
Solution
A
NO....you CANNOT just use one of the 6+2 PCIe connectors, you HAVE to use BOTH in order for the video card to work.

EDIT: However, if you are saying that your PSU has two 8-pin PCIE cables, with each splitting into two 6+2 connectors (for a total of four 6+2 connectors) then it might work, but I'd recommend using one cable per GPU connector (i.e.-use both cables).
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freeracercolin

freeracercolin

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You need to plug both cables into your card. You plug the 8-pins into the PSU and the 6+2 pins into the GPU. If you don't plug both in, then it card will not ever power up. You can fry the card by pushing too much power into it, but that is only done when overclocking.
 
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Bassereus

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Thanks for the quick answer, The cables that the PSU was shipped with splits, making two 6+2 pin plugs, can I use just one of the cables, as it divides and plug both plugs into the graphics card, will this give it enough power?

Or do I need to use both cables i.e. two cables in parallel? both plugged into the PSU and will this give it too much power, and potentially damage the card?

Please ask for me to clarify something if you need!

Cheers
 
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Bassereus

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Thanks as well for the fast response,

can I use just the one cable as it splits or do I need to use 2 cables in parallel? Is there a risk of damaging the card by just plugging it in wrong?

Cheers
 
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animal

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NO....you CANNOT just use one of the 6+2 PCIe connectors, you HAVE to use BOTH in order for the video card to work.

EDIT: However, if you are saying that your PSU has two 8-pin PCIE cables, with each splitting into two 6+2 connectors (for a total of four 6+2 connectors) then it might work, but I'd recommend using one cable per GPU connector (i.e.-use both cables).
 
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Solution
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Bassereus

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Yeah, I know I need to have both the sockets on the card occupied, it is that the cable divides potentially allowing you to use just one cable to go to 2x 8pin sockets will this supply my card with the power it needs?

Thanks


Just seen your edit thats great thanks very much will do that in parallel now. Will update as to the progress!

Cheers for your help!.
 
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animal

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Depends on if your PSU has a single or multi rail 12V setup. If it has a single 12V rail, then yes it would work. If it is a multi-rail PSU, then chances are one rail won't be able to supply the current requirements of the two GPU inputs, each PCIe cable coming from the PSU would be on a different rail if your PSU is multi-rail.
 
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bdiddytampa

bdiddytampa

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I would use both of the cables from your PSU. The power is regulated so there is no possibility of "cooking" your card unless you mess with voltages yourself. Your best bet is to avoid splitting the wires coming from your PSU.
 
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geofelt

geofelt

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It does not matter, the psu is able to handle anything you plug in to it.

For simplicity of wiring, use just one of the modular cables.
One end plugs into the 8 pin slot on the psu.
The other end will have two 6+2 connectors which you must plug in to your graphics card.

 
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