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powering graphics card.

I have a r9 270x that requires 2 six pin connections. right now I have been using a single cable coming from psu that splits into two pci connectors. Is this ok or should I plug a second pci cable into psu and have 2 pci cables going to graphics card?
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  1. Best answer
    If your PSU has 2 or more 12v rails then you want to split the load over them or if it has a dedicated PCI rail then use that plus 1 of the 12v rails. You need a 500w PSU which can output 24 amps, usually 1 rail will not be able to that that so the load must be split across multiple rails. There will be a sticker on the side of the PSU telling you how many 12v rails you have and what current output each will give. I hope that makes sense.
  2. zink1701 said:
    If your PSU has 2 or more 12v rails then you want to split the load over them or if it has a dedicated PCI rail then use that plus 1 of the 12v rails. You need a 500w PSU which can output 24 amps, usually 1 rail will not be able to that that so the load must be split across multiple rails. There will be a sticker on the side of the PSU telling you how many 12v rails you have and what current output each will give. I hope that makes sense.


    I have a seasonic G series 750watt psu. this is whats listed on output -+3.3V@20A, +5V@20A, +12V@62A, -12V@0.3A, +5Vsb@2.5A
  3. Cool then you are fine powering the card with the PCI cable you are using now. you can use the split PCI connectors without issue.
  4. Even if it was multi rail, many if not most, will just separate mobo to 1 rail, cpu to another, pcie to another, etc., so may still not make a difference. You have to check with the design to make sure. Also power is distributed to whatever rail needs it and you don't get "trapped power." But you have a single rail so it makes no difference here.
  5. so in my case i can leave the one cable feeding 2 pci connections on graphics card or plug in 2 pci cables to the psu. either way no difference? is this due to the 12volt@62amp?
  6. All the power is coming from a single source so it makes no difference what cables are connected to it.
  7. cool, thanks
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