I own an iMac9,1 2009 20" (early 2009 20" iMac9,1) which just been recently upgraded to 8GB RAM and SSD drive as well as a software upgrade to El Capitan.
I would like to know if there is a list of graphic cards compatible with my iMac and which also has Metal support so I could use to upgrade the current one which is a Nvidia GeForce 9400.
I've found out at the time, 2009, different configuration for iMac late 2009 included the following graphics card options:
Graphics, 2.66 GHz: Nvidia GeForce 9400M, used 256 MB of system RAM RAM, supports up to 1920 x 1200 external digital display, 2048 x 1536 analog display, and monitor spanning
Graphics, 2.93 GHz: Nvidia GeForce GT 120 with 256 MB dedicated VRAM
Graphics, 3.06 GHz: Nvidia GeForce GT 130 with 512 MB dedicated VRAM
Graphics: ATI Radeon HD 4850 build-to-order option
So I understand any VGA on the previous list should work on my early 2009 iMac 20". But I wonder if newer graphic cards from newer iMac (ie 2010, 2011, etc.) would also work.
The idea is to be able to update MacOS to a more recent version while the computer keeps on being usable.
Thanks a lot.