Power supply upgrade

Discussion in 'Mac Pro' started by All Taken, Dec 3, 2012.

  1. All Taken, Dec 3, 2012
    Last edited: Dec 3, 2012

    All Taken macrumors 6502a

    Joined:
    Dec 28, 2009
    Location:
    UK
    #1
    Does anybody know if it would be possible to extract the power supply in a Mac Pro, crack it open and replace the innards with a more powerful PSU?

    I ask as it would be nice to not have to go the external route, properly wired I imagine it is quite possible but would like so more information.

    Is anything about the Power supply modular? I know it has a specific connector to the back pane but other than this? The voltages supplied to each part of the system? Would a more powerful PSU wired into the bare Mac PSU provide too much voltage to the system? Can the components compensate and just draw what is required?

    I know people have said all along don't use power splitters for 8 pin Graphics cards for example, does this apply to SATA to 8 pin adapters too?

    Would the rails handle the extra power draw if it were possible?

    Thanks

    EDIT: Seems the traces would be the bottleneck anyway as they wouldn't allow the extra draw over a sustained period. Looks like an external PSU for me :(
     
  2. bax2003 macrumors 6502a

    bax2003

    Joined:
    Dec 25, 2011
    Location:
    Belgrade, Serbia
    #2
    Problem with MP PSU is motherboard connectors. You can see pinouts and details here:
    http://tinyurl.com/d9chedf

    PSU is not modular:
    [​IMG]

    You can use 6-pin to 8-pin PCIe adapters at your own risk. I can say that I used GTX570 for 6 months with 8 pin and 6pin power without problems and now I use Radeon 5870 and 5770 at the same time with one 6-pin Y splitter and everything is fine.

    You cant provide too much power from any PSU, problem is of course when you ask too much from it :).
    Too hide cables, reduce clutter and improve airflow, Apple provided two 6 pin conectors on the logic board.
    Best possible solution for extra GPU power is additional internal PSU specially dedicated to GPU.
     
  3. All Taken thread starter macrumors 6502a

    Joined:
    Dec 28, 2009
    Location:
    UK
    #3
    Thanks for that, using the pin out would it be possible to solder on a pair of PCI-e power connectors? perhaps 8 pin?

    So the 2x 6 pin on the board still get power but also have access to a couple of extra power sources, if the PSU can handle the extra draw then I avoid the risk of burning out the traces and I just have a couple of extra wires VS whole other power supply in the 5.25 bay.
     
  4. bax2003 macrumors 6502a

    bax2003

    Joined:
    Dec 25, 2011
    Location:
    Belgrade, Serbia
    #4
    Theoreticly, yes, and as far as i know you will be first to do such thing to MP PSU :)
    It is much cheaper and easier to get extra internal PSU.
    If you ask me, a would not put any more stress on Logic Board traces then one 6-pin PCIe Y splitter.

    With 4 HDDs, SSD, 5870 + 5770, 5 USB and 2 FW devices....bla bla, Mac Pro uses about 750W. Only worry are traces, and, I must say it again is my own risk. With first opportunity I will get internal PSU for GPU, because I want to keep this fantastic machine for a long time.
     
  5. El Awesome macrumors 6502

    El Awesome

    Joined:
    Jul 21, 2012
    Location:
    Zurich
    #5
    The Mac Pro has a 1000w PSU, why would you need more?
    You can use an external PSU if you need more power connectors.
     
  6. All Taken thread starter macrumors 6502a

    Joined:
    Dec 28, 2009
    Location:
    UK
    #6
    I'm sure you could figure out why, I don't want to take up space inside my case with another PSU. I don't want it to be external.

    If I could run an additional 2 cables for 2 x PCI-e power from the Mac Pro PSU this would be the best solution all round.
     

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