Amazon.com: Original Graphics Card GPU Replacement, for Apple iMac Late 2009 A1312 MC507LL/A 27-Inch Core i7 2.8 27-Inch Computer, AMD Radeon HD4850 HD 4850 GDDR3 512MB, MXM GPU Video Board Repair Parts :
ssd - What are my hardware upgrade options for a late 2009 iMac? - Ask Different
Original Graphics Card for Apple iMac 2009 Core 2 Duo 3.06 MB420LL/A MB420 A1225 24 Inch All-in-One Desktop PC, NVIDIA GeForce GT 130M GDDR3 512MB, GPU Video Board Replacement 180-10816-0000-C01: Graphics Cards:
Original Graphics Video Card GPU Replacement, for Apple iMac Late 2009 27 Inch Core i5 2.66 MB953LL/A A1312 All-in-One Desktop PC, AMD ATI Mobility Radeon HD 4850 GDDR3 512MB, MXM VGA Board
iMac 27" Video Card Upgrade | MacRumors Forums
iMac Intel 27" EMC 2374, AMD Radeon HD 4850 Video Card Removal & Repair - iFixit Repair Guide
Where is the GPU located and what gpu is it? (Late 2009 21.5” ) : r/mac
iMac Repair & Upgrade, Same Day Services
iMac Repair & Upgrade, Same Day Services
Upgrading an iMac GPU for METAL Support! Late 2009 – Mid 2011 Models - YouTube