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AMD Radeon HD 6970M 1GB Video Graphics Card Apple iMac A1312 27" Mid 2011 TESTED - eSocket.us
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Amazon.com: GDDR5 2GB Graphics Video Card Radeon HD 6970M for Apple iMac Mid-2011 27 Inch Core i5 i7 All-in-One Desktop PC Computer, AMD Radeon HD6970M HD6970 MXM Board GPU Upgrade Repair Parts :