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iMac 21.5" A1311 ATI Radeon HD 4670 Graphic Video Card Mid-2010 Apple HD4670 AMD
Apple iMac 27" A1312 ATI Radeon HD 4850 Graphics AMD Video Card 2009 2010 HD4850 512mb
Apple iMac 21.5" A1311 Mid 2011 AMD ATI Radeon HD 6750 Graphic Video Card HD6750 Computer Graphics & Heatsink