Up to gtx 780 mxm 3B Kepler cards will work in 09/10/11 21.5 and 27 iMacs… I would use 765m 2gb mem must have dell , Alienware bios or you can flash it your self… Not as difficult as it sounds… Cards are available on ebay for 99 and up . These work without any hacks on Mojave and allow graphic acceleration without any further tweaking. I’ve only tried the 2011 but others have done it 2009 and 2010 iMacs and I can’t see any reason why it wouldn’t… there is apple driver support natively built into Mojave for Kepler architecture this will probably end with Navi. You will still also need the Mohave upgrader kit from dos dude unless you have a hard drive with Mohave already installed. somebody probably has a video out by now … I would check for that.
=== Update (02/19/2019) ===
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[image|1689982]
chip flashers that were supposed to be included wit the above comment
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=== Update (02/19/2019) ===
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If you need to flash a chip before you install it or because you bricked your bios, there is 2 very good and inexpensive options I use... the small black one sells for around 8 bucks the other is a little more and comes with adapters to give you lots of other options for different chips... some excellent videos available for both of these tools and also for choosing the best free software to run... Check out at least several videos first before you decide what to use. Flashing while the chip is still inside your computer is recommended and much simpler... always do sufficient research before you start... Four out of five voices agree.
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Just added this because I'm noticing most people are unaware of these simple tools.
Up to gtx 780 mxm 3B Kepler cards will work in 09/10/11 21.5 and 27 iMacs… I would use 765m 2gb mem must have dell , Alienware bios or you can flash it your self… Not as difficult as it sounds… Cards are available on ebay for 99 and up . These work without any hacks on Mojave and allow graphic acceleration without any further tweaking. I’ve only tried the 2011 but others have done it 2009 and 2010 iMacs and I can’t see any reason why it wouldn’t… there is apple driver support natively built into Mojave for Kepler architecture this will probably end with Navi. You will still also need the Mohave upgrader kit from dos dude unless you have a hard drive with Mohave already installed. somebody probably has a video out by now … I would check for that.
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=== Update (02/19/2019) ===
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[image|1689982]
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chip flashers that were supposed to be included wit the above comment
Up to gtx 780 mxm 3B Kepler cards will work in 09/10/11 21.5 and 27 iMacs… I would use 765m 2gb mem must have dell , Alienware bios or you can flash it your self… Not as difficult as it sounds… Cards are available on ebay for 99 and up . These work without any hacks on Mojave and allow graphic acceleration without any further tweaking. I’ve only tried the 2011 but others have done it 2009 and 2010 iMacs and I can’t see any reason why it wouldn’t… there is apple driver support natively built into Mojave for Kepler architecture this will probably end with Navi. You will still also need the Mohave upgrader kit from dos dude unless you have a hard drive with Mohave already installed. somebody probably has a video out by now … I would check for that.