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I'm looking for which GPU would be appropriate to replace my mid-2011 iMac's original GPU which is a Radeon HD 6750M, I'm looking for a $ 100 budget card, but one that may be newer to support a forced macOS upgrade. I would appreciate if someone could recommend me some GPUs within the budget but above all compatible.

SteelWalter
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    As I posted on your now-deleted Q in Hardware recs, this is a hugely complex subject - see https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/ See also https://macexpertguide.com/2011-imac-graphics-card-upgrade-how-to/ – Tetsujin Apr 29 '22 at 07:28
  • Thank, the second link is useful, it contains a list of GPU and that is what I'am looking for – SteelWalter Apr 29 '22 at 07:58
  • The first link also shows several lists of GPUs with pros & cons. It is considerably more comprehensive than the quick work-through of the second. – Tetsujin Apr 29 '22 at 08:00
  • SteelWalter: Here is a question posted by a user who has Big Sur installed on a 21.5-inch, Mid 2011 iMac. You might want to follow this question and/or post any questions about installing as comments. – David Anderson Apr 30 '22 at 22:49

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