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iMac 21.5-Inch "Core i5" 2.5 (Mid-2011) Specs (Mid-2011, MC309LL/A, iMac12,1, A1311, 2428): EveryMac.com
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Refurbished: Apple iMAC A1311 21.5" Logic Motherboard Mid 2011 Late 2011 639-2347 820-3126-A - Newegg.com
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For iMac 27" A1312 HD5750 1GB Video Card 2010 Year 109 B97157 00 216 0769034 HD 5750 Graphic Card Replacement|card card|card graphiccard video - AliExpress
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Amazon.com: 2GB Graphics Card GPU Upgrade Replacement for iMac 27 Inch Mid-2011 A1312 Desktop Computer Core i5 3.1 MC814LL/A MC814, AMD Radeon HD 6970M GDDR5 2 GB MXM Video Board Repair Parts :
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