Caldigit FASTA-6GU3 Pro TDP power draw

Discussion in 'Mac Pro' started by steviewhy, Jul 4, 2014.

  1. steviewhy macrumors regular

    Joined:
    Oct 12, 2011
    #1
    Does anyone happen to know the power draw of this card. I can't find it documented anywhere including their site. The reason I ask is I don't want to overdraw the pci-e 300 watt total combined limit when I upgrade my video card.

    Anyone know?
     
  2. TzunamiOSX macrumors regular

    Joined:
    Oct 4, 2009
    Location:
    Germany
    #2
    I see a maximum of 1 Ampere in my 7 days timeline.

    P = U x I
    P = 12V x 1A
    P = 12 Watt

    But what are you talking about? 300 Watt total combined? The Mac Pro PSU has 5 rails, but no one can really say, which rail is for what. If you want a GPU who need over 225 Watt it is better to use a Aux PSU.
     
  3. steviewhy thread starter macrumors regular

    Joined:
    Oct 12, 2011
    #3
    Thanks for that. That 12 Watts is pretty low so it shouldn't be a problem. The 300 Watt total I was referring to is the total watts that all of the pci-e slots combined can equal. I was toying with the idea of dropping a pc gtx770 (230 Watt) in there but it's not worth the gamble. Or maybe it is. :D
     
  4. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    For your info.

    My 7950 also draw about 230W under full load. It only get about 50W from the PCIe slot, the other 180W from the 6 pin cables.

    Even though it draw 75W or even 100W from a single PCIe slot, it still far from the 300W limit.
     
  5. TzunamiOSX, Jul 5, 2014
    Last edited: Jul 5, 2014

    TzunamiOSX macrumors regular

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    Oct 4, 2009
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    #5
    300 Watt is 75 Watt for each of the 4 Slots. 75 x 4 = 300

    BUT: You can't get 300 Watt form only one PCIe slot. If you install a GPU you get 75 Watt from the PCI and the rest from the GPU power connectors.
    The cMP has 2 x 75 Watt GPU power connectors. If your GPU need more then 225 Watt (1 x 75 Watt PCIe + 2 x 75 Watt GPU connector) you need a AUX PSU or you get the power from other sources like the HD connector.

    You think, 5 Watt more is not a problem i will use an Adapter! But there is a problem. The 770 has a 8 Pin connector who can pull up to 150 Watt (2 x 75) and the the power is split approximately evenly to all connectors. 230 Watt / 4 = 57,5 Watt

    So you can get:
    PCIe ~ 57,5 Watt
    GPU con 1 ~ 57,5 Watt
    GPU con 2 (with a 8 to 6 adapter) ~ 115 Watt (not good)

    But perhaps when you downclock the 770 to 225 Watt (-5 Watt) this can eliminate the 115 Watt problem. But it is better to ask guys like MacVidCards about this.
     
  6. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #6

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