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Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube
iMac (Early 2009) | Low End Mac
Apple 21.5" iMac All in One Desktop Computer Core i5 4GB Ram 500GB HD OS High Sierra and WIFI Keyboard And Mouse - GRADE B
Amazon.com: Genuine Graphics Video Card for Apple iMac Late 2009 A1311 Core 2 Duo 3.06 21.5 Inch Desktop PC MB950LL/A MB950, AMD ATI Radeon HD 4670 GDDR3 256MB, MXM VGA Board GPU
Amazon.com: Genuine Graphics Video Card for Apple iMac Late 2009 A1311 Core 2 Duo 3.06 21.5 Inch Desktop PC MB950LL/A MB950, AMD ATI Radeon HD 4670 GDDR3 256MB, MXM VGA Board GPU
memory - What can be replaced/upgraded in a late-2009 iMac to make it run like a 2014-2016 iMac? - Ask Different
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Apple iMac 21.5-inch Late 2009 3.06GHz Intel Core 2 Duo (MB950LL/A) – UNICOM, Inc.
How to upgrade a Mac: Swap in new RAM, graphics card, hard drive and more | Macworld