gtx670 along with 5770

Discussion in 'Mac Pro' started by BigJohno, Sep 2, 2012.

  1. BigJohno macrumors 65816

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    #1
    Hey everyone. Quick question. I'm thinking about buying a gtx 670 in the next month or so. I would like to keep my stock 5770 in my machine to run my second monitor. I know that the gtx takes two 6pin powers and the 5770 1.

    A 5770 can pull 110W(9A) (more or less) at full load and the 670 pulls about 150 I think. I know thats under the total 300 that the board can handle.

    What are your thoughts on this? Should I buy gt120 and call it a day or do I have a chance at running the setup above?
     
  2. Asgorath macrumors 65816

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    Mar 30, 2012
    #2
    Why not just run both monitors from the GTX 670? You can keep the 5770 in case you ever need a boot screen, but there's no good reason you need multiple cards to drive 2 monitors.
     
  3. BigJohno thread starter macrumors 65816

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    #3
    I would need an expensive converter to run the other monitor. I have 24" and 27 ACD... unless anyone has another solution..
     
  4. CaptainChunk macrumors 68020

    CaptainChunk

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    #4
    In your situation, I'd probably buy a GT 120. It doesn't require auxiliary power and it would give that second MDP you need. (if I'm reading correctly, both your displays are ACDs, right?)
     
  5. Asgorath macrumors 65816

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    #5
  6. Wardenski macrumors 6502

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    #6
    For what its worth from a PSU point of view I use an overclocked PC 5870 (6 pin + 8 pin) with the Apple 5770 (6 pin).

    The 5870 does virtually nothing on the OSX side although if I connected a DVI to it I would get a second screen.

    The 5770 does virtually nothing in the Windows side. I tax the 5870 regularly playing Crysis for almost 2.5 years with no problems.
     
  7. BigJohno thread starter macrumors 65816

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    #7
    YEs both ACDs w/ MDP

    ----------

    This is what I was planning on using. There is no other way to run the other monitor off the card without an expensive adaptor.

    ----------

    Thank you for this. You are just splitting the power off the board?
     
  8. Wardenski macrumors 6502

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    Jan 22, 2012
    #8


    The two 6 pin connectors come from the motherboard but the 8 pin one comes from the spare lead in the 5.25 bay using a Y splitters. As a result there are wires hanging out the side of my Mac Pro.

    I would not recommend splitting the two 6 pin connectors on the motherboard, there's a risk you could draw too much current through them.
     
  9. Asgorath macrumors 65816

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    Mar 30, 2012
    #9
    I'm confused. Are you suggesting a $7 adapter is too expensive? This really seems like the simplest solution, i.e. running just the GTX 670 with 2 6-pin power cables driving both your monitors. No external power supply needed, no power cable splitter (which would probably be roughly $7 as well).
     
  10. CaptainChunk, Sep 3, 2012
    Last edited: Sep 3, 2012

    CaptainChunk macrumors 68020

    CaptainChunk

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    #10
    I think the OP is actually referring to the fact that the reference GTX 670 cards only have ONE DisplayPort (and he needs two). The $7 adapter would be fine to convert the card's full-sized DP connector to MDP. But to get his second ACD running on the same card, he would have to buy an active adapter like this one to convert the DVI port to MDP.
     
  11. Asgorath macrumors 65816

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    #11
    Ahh yes, I mistook the HDMI port as a 2nd DP port, my bad.
     
  12. BigJohno thread starter macrumors 65816

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    #12
    Exactly. Thanks.
     

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