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Geforce GTX 780 power supply with a single PCI-E 8 pin cable?

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January 30, 2014 10:29:24 AM

Hello guys

I'm in my final steps to finish my first computer build but now i have the power supply to the graphic card left to connect.

But there is a problem with the numbers of PCI-E ports on the PSU. It only has one PSI-E 8 pin connection:( 

Now my question is: Can i use a single PSI-E (8 pin on one end and two 6+2 pin on the other) to supply my graphic card. The card requires one 8 pin and one 6 pin.

My PSU: Corsair PowerSupply CX750M 750W
My graphic card: ASUS GeForce GTX 780 3GB DirectCU II OC (GTX780-DC2OC-3GD5) (I have not overclocked it)

For more info on graphic card:
http://www.asus.com/Graphics_Cards/GTX780DC2OC3GD5/#ove...

For more info on PSU:
www.corsair.com/en/cx-series-cx750m-modular-atx-power-s...

The rest of the computer (if you need the info):
RAM: 2 x G.Skill Ares 16GB DDR3 PC-12800 1600MHz
Motherboard: ASUS Z87-A - ATX / Z87
CPU: Intel Core i7-4770K
a b ) Power supply
a b U Graphics card
January 30, 2014 10:37:27 AM

Not quite You seem to have more then enough cables to power it. As long as all power plugs on the video card are occupied it will run.

If you are asking if a 6+2 pin is okay to use with only the 6 pins, yes, that will work fine, that is the intention behind the split design.
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January 30, 2014 10:43:26 AM

I have one 8 pin port from the PSU. Will it be enough to power both 8 pin and 6 pin ports on the graphic card?
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January 30, 2014 11:00:51 AM

Eximo said:
Not quite You seem to have more then enough cables to power it. As long as all power plugs on the video card are occupied it will run.

If you are asking if a 6+2 pin is okay to use with only the 6 pins, yes, that will work fine, that is the intention behind the split design.


So the PSU wont do then?
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a b ) Power supply
a b U Graphics card
January 30, 2014 11:04:23 AM

Well from the specs for that PSU it has 4x6+2 PCI-E connectors so you should have more than enough for that single card. Not sure what the problem is really? You would use one of the connects as a 8pin(6+2) and the other as a 6pin leaving out the split two connectors to power the card.

It is modular are you saying you do not have all of the connectors?
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January 30, 2014 11:24:12 AM

bryonhowley said:
Well from the specs for that PSU it has 4x6+2 PCI-E connectors so you should have more than enough for that single card. Not sure what the problem is really? You would use one of the connects as a 8pin(6+2) and the other as a 6pin leaving out the split two connectors to power the card.

It is modular are you saying you do not have all of the connectors?


ok I do have enough PSI-E cables and connectors on the PSU. I just dont know what port i going to use for the second PSI-E. There is a picture on the backside of the PSU on this link below. Can you tell me which i shall use? (i know the 8 pin connect on the top right is one i shall use but i don't know for the other one) http://www.technic3d.com/review/netzteile/1575-corsair-...
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January 30, 2014 11:35:12 AM

aevm said:
Your PSu is fine. It has 4 of these connectors:

http://www.playtool.com/pages/psuconnectors/pcie6plus2....

Use one in the 8-pin socket on the GPU. Use another in the 6-pin socket, moving the extra 2 pins aside.


I just dont know what port i going to use for the second PSI-E. There is a picture on the backside of the PSU on this link below. Can you tell me which i shall use? (i know the 8 pin connect on the top right is one i shall use but i don't know for the other one) http://www.technic3d.com/review/netzteile/1575-corsair-...
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a b ) Power supply
a c 143 U Graphics card
January 30, 2014 11:53:32 AM

Check the FIXED cables that come out of the PSU. Two of them should end in 6+2 pins, like the picture I linked earlier. You only have one graphics card, so plug those two in the card. You do not need to use any of the two 8-pin sockets at the back of the PSU.
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January 30, 2014 12:29:54 PM

aevm said:
Check the FIXED cables that come out of the PSU. Two of them should end in 6+2 pins, like the picture I linked earlier. You only have one graphics card, so plug those two in the card. You do not need to use any of the two 8-pin sockets at the back of the PSU.


Both of those PSI-E cables that i have are (solid) 8 pin on one end and two 6+2 pin on the other end. Otherwise i will have a 6 pin connected to the PSU and a 8 pin on the graphic card port. Wouldn't mess the power supply?:S By the way, can i use the CPU port as a PSI-E port which is located at the bottom right? It's a 8 pin but idk if its ok.
http://www.technic3d.com/review/netzteile/1575-corsair-...
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a b ) Power supply
a b U Graphics card
January 30, 2014 1:31:47 PM

The supplemental connector for the motherboard should be plugged in to the motherboard. That is required to power the CPU, and it does not fit a PCI-e port.

Still not sure what exactly you mean. You should have two cables going from the power supply directly to the video card. One that ends in an 8pin PCI-e connector and one 6+2pin connector with the extra two pins unconnected as stated above.
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Best solution

a c 1167 ) Power supply
a c 540 U Graphics card
January 30, 2014 1:36:38 PM

emperormalt said:
aevm said:
Check the FIXED cables that come out of the PSU. Two of them should end in 6+2 pins, like the picture I linked earlier. You only have one graphics card, so plug those two in the card. You do not need to use any of the two 8-pin sockets at the back of the PSU.


Both of those PSI-E cables that i have are (solid) 8 pin on one end and two 6+2 pin on the other end. Otherwise i will have a 6 pin connected to the PSU and a 8 pin on the graphic card port. Wouldn't mess the power supply?:S By the way, can i use the CPU port as a PSI-E port which is located at the bottom right? It's a 8 pin but idk if its ok.
http://www.technic3d.com/review/netzteile/1575-corsair-...


The only fixed/hardwired cables on the CX750M are the (20+4)-pin ATX motherboard connector and the (4+4)-pin CPU power connector made from two 4-pin connectors each on a ribbon cable.

The two modular PCI-E cables each have two (6+2)-pin PCI-E connectors and a solid 8-pin connector that plugs into one of the two 8-pin connectors the PSU's modular panel.

You only need to use one PCI-E cable from the PSU to the graphics card.

The PSU is a single +12V rail design so you don't need to worry about load distribution.
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January 30, 2014 1:53:54 PM

ko888 said:
emperormalt said:
aevm said:
Check the FIXED cables that come out of the PSU. Two of them should end in 6+2 pins, like the picture I linked earlier. You only have one graphics card, so plug those two in the card. You do not need to use any of the two 8-pin sockets at the back of the PSU.


Both of those PSI-E cables that i have are (solid) 8 pin on one end and two 6+2 pin on the other end. Otherwise i will have a 6 pin connected to the PSU and a 8 pin on the graphic card port. Wouldn't mess the power supply?:S By the way, can i use the CPU port as a PSI-E port which is located at the bottom right? It's a 8 pin but idk if its ok.
http://www.technic3d.com/review/netzteile/1575-corsair-...


The only fixed/hardwired cables on the CX750M are the (20+4)-pin ATX motherboard connector and the (4+4)-pin CPU power connector made from two 4-pin connectors each on a ribbon cable.

The two modular PCI-E cables each have two (6+2)-pin PCI-E connectors and a solid 8-pin connector that plugs into one of the two 8-pin connectors the PSU's modular panel.

You only need to use one PCI-E cable from the PSU to the graphics card.

The PSU is a single +12V rail design so you don't need to worry about load distribution.



THANKS DUDE IT WORKS!! X)

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