Graphics card upgrade in 27" iMac Mid 2011?

Discussion in 'iMac' started by krgarton, Jan 12, 2015.

  1. krgarton macrumors newbie

    Jan 12, 2015
    I'm looking to upgrade the graphics card in my 27" iMac Mid 2011, which currently has a AMD Radeon HD 6970M 1024 MB. I have been unable to find out what NVIDIA graphics cards are compatible... I would love to upgrade to something like what they ship in the new iMacs- the NVIDIA GeForce GTX 775M graphics processor with 2GB of GDDR5 memory. Can anyone offer advice as to what is compatible and the best place to purchase? Thanks in advance.
  2. Astelith macrumors regular

    Oct 10, 2014
    I heard of some incompatibility with Yosemite if you upgrade the card on old iMacs, I think is more convenient for you to see your iMac and go for a newer model, even 2nd hand, also because with a non apple card you are going to loose the boot screen.
  3. frets macrumors newbie


    Jun 26, 2016
    has anyone had any luck upgrading to Mac OS Sierra whilst using a GTX 780m chip??
  4. kpgh554 macrumors regular


    Dec 29, 2011
    iver england
    I upgraded my neighbours 27" imac with a 4gb one he got off ebay and he very pleased with it as he and his son say it now plays online gaming like battle tank etc amazingly fast.
  5. Double-G macrumors newbie

    May 29, 2015
    Which specific model was that, please?
    Do all functions like the white bootscreen and brightness control work?
  6. xxbeefydjxx macrumors newbie

    Nov 18, 2017
    Very late reply but if you cannot find a card which came out of a iMac or a VBIOS dump for the card then you will lose Brightness and Boot screen functionality, you also have to mess with drivers every time you update and occasionally do a PRAM reset if it fails to boot into OSX

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