Amazon.com: Original Graphics Video Card for Apple iMac Core i7 2.8 27-Inch Late 2009 A1412 MC507LL/A MC507 Desktop Computer, AMD ATI Mobility Radeon HD 4850 GDDR3 512MB 109-B91157-00, GPU Upgrade Replacement : Electronics
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Amazon.com: Original Graphics Card GPU Replacement for Apple iMac 2009 Core 2 Duo 3.06 A1312 MB952LL/A 27 Inch Desktop PC Computer, ATI Mobility HD 4670 GDDR3 256MB 109-B80357-00, MXM Video Board Repair Parts : Electronics
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Mid-range GPU comparison: Gigabyte GTS 250 1GB and 9600GT 512MB Graphics Cards - PC Perspective
Late 2009 iMac 27" Video Card Repair — 4850 — 2nd Bake - YouTube
NVIDIA GeForce United Kingdom - It's 2009 and the GeForce GTX 285 is now the fastest single-GPU graphics card on the market. Bonus? It's suprisingly quiet and has lower power consumption than
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