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This thread on MacRumors has everything you need to know. https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/ https://forums.macrumor

• ce4 2y ago
  Ha, I remember that thread! I did the same with a dumpster find in 2020. I saw the guy hauling and depositing it, so I asked and got it (2011 iMac 27" with maxed out specs at ordering time - radeon 9800, i7, 16gb ram, ssd+2tb hdd. Almost mint condition). It had of course 2 issues: - backlight was dead on one half of the screen - infamous radeon BGA soldering issue, intermittent glitches & os freezing when it had warmed up I resoldered the backlight connector (apparently broke off the pcb under mechanical stress) and swapped in a used $20 Nvidia Quadro that I had flashed with nick's hacked rom from the above thread. I did not want to do some hackintosh mods to the OS so i went with (iirc) mavericks and sold it on classifieds for $430 after noone in my circle wanted it. I was also able to sell off the mxm radeon 9800/2GB for $30, placed the ad just for curiosity about it's resale value in such a broken state. :) The money was just by-catch, the real joy always comes from resurrecting broken things (for me).