G5 Late 2005 LED lighting power problem

Discussion in 'PowerPC Macs' started by LarsG5, Nov 8, 2016.

  1. LarsG5 macrumors member

    LarsG5

    Joined:
    Aug 10, 2016
    #1
    Hi,
    I'd love to mod my PM G5 by adding LED strips inside, but I've ran into a problem I don't know how to solve.
    As I have upgraded the GPU, the 6 pin pci-e power socket on the motherboard is already occupied, along with the two of four pci-e expansion lanes. I have both HDD bays occupied as well, and I don't want to unplug the DVD drive.
    How can I source power for LED strips then? Can I use a molex splitter to gain a second connector from the DVD one? Or could I install a pci-e expansion card with a couple of additional sata connectors, and then use some sata to molex adapters and source the power I need that way?

    I'd be very grateful for any advice :(
     
  2. gavinstubbs09 macrumors 65816

    gavinstubbs09

    Joined:
    Feb 17, 2013
    Location:
    NorCal boonies ~~~by Reno sorta
    #2
    Yes you can split from the optical drive power cable.
     
  3. LarsG5 thread starter macrumors member

    LarsG5

    Joined:
    Aug 10, 2016
    #3
    Thanks for the reply!
    But still, it'll allow me to install only one LED strip, right?
    Is there anyway I could source the power from a pci-e lane, as I've got two of them unoccupied?
     
  4. gavinstubbs09, Nov 8, 2016
    Last edited: Nov 8, 2016

    gavinstubbs09 macrumors 65816

    gavinstubbs09

    Joined:
    Feb 17, 2013
    Location:
    NorCal boonies ~~~by Reno sorta
    #4
    I would say that you could run 2 safely since LEDs pull very little power.

    Unfortunately I'm not aware of any way to pull power from the PCI-e lane so your best (and easiest) bet would be splitting from the ODD.
     
  5. LarsG5 thread starter macrumors member

    LarsG5

    Joined:
    Aug 10, 2016
    #5
    Thanks!
    Two strips are still not enough for me, but better two than zero...
     
  6. Daniël Oosterhuis macrumors 6502a

    Daniël Oosterhuis

    Joined:
    Jan 10, 2016
    Location:
    Black Mesa Research Facility
    #6
    How much LED strips do you want to run? I very much doubt you could run enough to pull too much power from the ODD line, since LEDs are so energy efficient.
     
  7. LarsG5 thread starter macrumors member

    LarsG5

    Joined:
    Aug 10, 2016
    #7
    I was thinking about at least 4...
    Btw, what about usb as a power source?
     
  8. thats all folks macrumors 6502a

    thats all folks

    Joined:
    Dec 20, 2013
    Location:
    Austin (supposedly in Texas)
    #8
    USB supplies 5V. the Molex on the DVD will give both 12 and 5. so, depends on your lights.
     
  9. Daniël Oosterhuis macrumors 6502a

    Daniël Oosterhuis

    Joined:
    Jan 10, 2016
    Location:
    Black Mesa Research Facility
    #9
    I'm fairly sure you can pull off 4 on one ODD line. I'd leave the USB alone as they have a limited power rating, which could lead to problems when using a USB device that uses a lot of power.
     
  10. LarsG5 thread starter macrumors member

    LarsG5

    Joined:
    Aug 10, 2016
    #10
    When it comes to USB, I was thinking about a separate internal pci-e controller only to power LEDs, so there would be no problem with other devices.

    So... You think it's possible to power ODD and 4 LED strips from a single molex. That would be awesome!
     
  11. RhianB macrumors 6502

    RhianB

    Joined:
    Sep 3, 2016
    Location:
    Albuquerque, NM USA

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