Amazon.com: Valley Of The Sun Genuine Graphics Video Card Replacement for Apple iMac Mid-2010 Core i5 A1312 27-Inch MC511LL/A MC511 Desktop PC, ATI Mobility Radeon HD 5750 GDDR5 1GB MXM Board :
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SAPPHIRE 100284L Radeon HD 5750 1GB 128-bit GDDR5 Video Card - Newegg.com