The splitting of the +12V rail

Discussion in 'Power Supplies' started by jonnyGURU, Mar 19, 2008.

  1. MongGrel

    MongGrel Lifer

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    Heh, a 650 probably would.

    If not hooked to an AMD depends.
     
  2. 3DVagabond

    3DVagabond Lifer

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    Easily.
     
  3. aatroxed

    aatroxed Junior Member

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    All right, so if I understand correctly for example the gtx 570 has a recommended +12 Volt rating of 38 Amps (not sure if that's for the system or just the GPU itself).

    My Seasonic S12 500W (probably a single rail) has listed +12V1 ~ 17A , +12V2 ~16A , -12V ~ 0.8A.

    I know its not always a straight up addition but it would appear I just come in under the recommended amperage?
     
    #78 aatroxed, May 19, 2014
    Last edited: May 19, 2014
  4. PPB

    PPB Golden Member

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    Hi, Lurking for a possible cause of arctifacting in several of the GPUs I used I came to the idea it might be my PSU afterall causing this.


    The PSU in question is a OCZ 750W Fatality (semi-modular version):

    Checking HWSecrets' review, they come to the conclusion they rail splitting is something like this:

    +12V1 (18A) (solid yellow wires): Main motherboard cable.
    +12V2 (18A) (yellow/red wires): Half of the ATX12V/EPS12V connector.
    +12V3 (18A) (yellow/green wires): Half of the ATX12V/EPS12V connector, half of the modular connectors (two for video cards and two for SATA/peripheral).
    +12V4 (18A) (yellow/black wires): EPS12V connector, half of the modular connectors (two for video cards and two for SATA/peripheral).

    The PSU's internals:

    [​IMG]
    [​IMG]
    [​IMG]

    ATM I have a 8320 paired with a Gigabyte 760 OC. Since I OC my CPU, I want to make sure they run on different Rails, the ideal distribution in my mind being the 8320 being plugged via the 2X4 Pin connector (so the 280W crunching OC'd CPU gets a lot of wattage to play with, having 2 Rails almost exclusively for this purpose). According to HWSecrets, it would sit in the +12V2 and +12V3 rails. This leaves the +12V4 as my target rail for my GPU.

    Considering the images above, which 2 power connectors would belong to the +12V4 Rail?
     
    #79 PPB, Oct 5, 2014
    Last edited: Oct 5, 2014
  5. greybaby

    greybaby Member

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    Thank you for posting this information. Generally, and I mean anyone using under 1000w (most users), all more than one rail does is make it likely that you'll do something wrong with multiple gpu's.