Help understanding power distribution

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Spongecak3

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Aug 4, 2013
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So I own an Antec 750W HCG PSU which states that it has 4 12V@40A "rails". Physically it has 2 cables with a 6 pin half way up the cable and an 6+2 at the end. If I plug both the 6 and 6+2 from one cable into say a gpu am I providing potentially 80A or 40A total? Alternatively if I plug the 6 from one cable and 6+2 from the other I assume I am providing 80A total right?
 
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Eximo
Not sure where that 42A value comes from.

ASUS GTX 780 has one 6pin and one 8pin power connector. Adding in the slot only goes up to 300W, or 25A. They are probably informing you that you need at least 42A available for the system and the video card. Just a safety on their part.

If the individual wires go all the back to the power supply you shouldn't have any concerns. If, for whatever reason, they actually have splitters, one wire becoming two, then you should not use both at the same time.
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Eximo

Eximo

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None of the above. 4 12V@40A rails would provide 1920W, so something isn't right, which is more then you can pull from the wall in most cases.

Each 6pin connector is rated at 75W, each 8 (or 6+2 pin) is rated at 150W. PCIe 16x slots can also deliver 75W.

Power rails within a power supply is more about architecture of the circuitry. They are saying that you can pull a max of 480W or 40A through any one of the rails without tripping something. Your total output is still going to be around 750W. You would have to look inside the supply to see which of your wires goes to which rail, but you should be fine just plugging things in with that high a limit. If properly designed you shouldn't be able to overload a rail using the provided plugs.

 
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Spongecak3

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Aug 4, 2013
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So for an asus 780 which needs 42A, would it matter if I plugged in 1 cable or do i need to share the load between two? I already know I have the watts for it just curious how the amps work.
 
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Eximo

Eximo

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May 27, 2010
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Not sure where that 42A value comes from.

ASUS GTX 780 has one 6pin and one 8pin power connector. Adding in the slot only goes up to 300W, or 25A. They are probably informing you that you need at least 42A available for the system and the video card. Just a safety on their part.

If the individual wires go all the back to the power supply you shouldn't have any concerns. If, for whatever reason, they actually have splitters, one wire becoming two, then you should not use both at the same time.
 
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