Asus GTX 780

Discussion in 'Mac Pro' started by hal9000Mark2, Feb 23, 2014.

  1. hal9000Mark2 macrumors newbie

    Joined:
    Aug 30, 2009
    #1
    Hi guys,

    I'm thinking about getting the Asus GTX 780. I want to make sure that it'll work with Mac Pro 3,1. I'm not bothered by link speed or boot screen.

    I noticed that there are two spare SATA ports (they are called "odd sata") on my motherboard. I'm thinking of using the 2x 6-pin ports for the 8-pin on the GTX and the two SATA ports for the 6-pin on the GTX using this adaptor http://www.amazon.co.uk/gp/product/B007Y91B80/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1.

    Do you think this would be work? How much power does a SATA port give?

    PCIE = 75W
    2x6 pin = 150W
    2xSATA = ??

    Thanks for any help!
    Hal

    ----------

    So I just did a bit of research. SATA ports carry 15 pins, of which 9 are power. 3x3.3V, 3x5V and 3x12V with 1.5amps each pin.

    A bit of maths ( http://www.rapidtables.com/calc/electric/Amp_to_Watt_Calculator.htm ) we get:

    3pins x 12V = 54 W

    2xPorts = 108W

    Does that seem right?

    Thanks!
     
  2. malana macrumors member

    Joined:
    Dec 10, 2009
  3. Cindori macrumors 68040

    Cindori

    Joined:
    Jan 17, 2008
    Location:
    Sweden
    #3
    The ports on your mobo are SATA data ports. Not SATA power ports.
     
  4. slughead macrumors 68040

    slughead

    Joined:
    Apr 28, 2004
    #4
    I think he's talking about the "SATA" power ports

    [​IMG]

    As far as your math, OP, you're technically correct: The PCIe, the on-board 6 pin, and the SATA ports can conduct enough amperes to power the card.

    However, you have 6 x 12v leads entering the card, how do you make sure one doesn't draw too much power from the sata power, melting the connector? If it melts one connector, it'll melt the other one for sure shortly after, then you're left with the motherboard tracers and it's unclear how long they'll hold out.

    Maybe you could build a circuit to limit / cut off the extra amperes, or maybe you could solder all the 12v leads together and hope for the best.

    I don't know if the setup you're talking about would work or not, perhaps the physics majors can chime in?

    Also, does anyone know how many 12v rails are in the MP PSU?
     
  5. funwithdesign macrumors regular

    Joined:
    Dec 9, 2011
    #5
    Not if he's referring to the ODD Sata ports on the motherboard.
     
  6. 666sheep macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #6
    2006 and 2008 had 6, 2009+ had one - according to labels on PSUs.
     

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