EVGA GTX 680 Classified Question

Discussion in 'Mac Pro' started by StockDC2, Apr 3, 2015.

  1. StockDC2 macrumors regular

    May 16, 2011
    Hello, I am interested in flashing my EVGA GTX 680 Classified for the Mac Pro but was wondering if the internal power supply is able to provide the much needed power to the card. I've also noticed that MVC mods their card to use a 6 pin vs the 8 pin cable. Is there a difference between the 2 other than the number of pins? Thanks in advance for the help!
  2. Synchro3, Apr 5, 2015
    Last edited: Apr 5, 2015

    Synchro3 macrumors 68000


    Jan 12, 2014
    I doubt the normal available EFI ROM has the mod to use 6 Pin to 8 pin cables.

    If it is an unflashed PC card you have to use these cables: http://www.ebay.co.uk/itm/Akasa-SATA-Power-to-6pin-PCIe-Adapter-Cable-/381079601344
    and http://www.ebay.co.uk/itm/GENUINE-E...ARD-POWER-CABLE-ORIGINAL-ONE-19-/321672328779

    All pins have to be connected.

    If the card is a flashed version from MacVidCards, AFAIK you can use the normal 6 pin cables.

    Update: I noticed now the classified version of the GTX 680 has two 8 pin connectors, not a 6 and an 8 pin. I highly doubt the internal power supply is able to provide the needed power to the card.

    Attached Files:

  3. ActionableMango macrumors G3


    Sep 21, 2010
    Do you specifically need a Classified? For the Mac Pro it's way easier to use almost any other GTX 680, nearly all of which only require 2x6-pin power that is already available in the Mac Pro.
  4. MacVidCards Suspended

    Nov 17, 2008
    Hollywood, CA
    The awesome but unknown fact about these cards is that they are unique in having 3 different EEPROM chips. Now when we mod them we include a PC BIOS on green, a downclocked Mac EFI on Yellow, and a fully clocked Mac EFI on Red position. Gives the maximum flexibility.

    There are tiny LEDs on the back that change.

    In my experience, the GK104 is almost incapable of drawing too much power. By that I mean that in order to go past what can be delivered on the cables and logic board, you would have told turn voltages a and clicks past the point where the cards would be stable.

    Fun cards, but with Maxwell's advancements not so much interest in them anymore.

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