Multiple GPU power question

Discussion in 'Mac Pro' started by Videographer, Sep 8, 2011.

  1. Videographer macrumors member

    Aug 15, 2006
    Grand Rapids, MI
  2. Neodym macrumors 68000


    Jul 5, 2002
    Mechanically they would probably work, but the two mainboard sockets may not be sufficient to power both cards under full load, so you might end up with burned traces and overheated sockets on the mainboard. Burned plastic smells really nasty ...
  3. nanofrog macrumors G4

    May 6, 2008
    Both of those cards will draw more power than each of those GPU power connectors on the main board are designed to handle (6 pin PSIG is only rated for 75W). And trying to draw more than would likely damage both the board (melt the Hot Air Leveled solder causing a short), and PSU. Neither is desirable.

    So to prevent this from happening, you need to run an additional PSU, and route the GPU power cables into the MP via an open PCI bracket (jump the green and black wires on the mainboard connector to turn it on).

    There used to be something called a JuiceBox (GPU PSU that fit in a 5.25" bay), but they've gotten hard to find (suspect they're out of production). But if you're in the US, you might be able to find one (was made under a few names), or get one used from places like eBay or Craig's List if you're interested.

    EDIT: Found an example on Amazon.
  4. Squishy Tia macrumors regular

    Squishy Tia

    Nov 17, 2010
    Good luck getting that power corde routed into the optical bay. It'd physically fit, but it likely wouldn't be long enough for the end-run you have to do in order to reach the rear connection on the PCI-E PSU box.

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