Apple has begun a graphics card replacement program for the 27-inch mid-2011 iMac, reports 9to5Mac. The news comes from a leaked memo issued to some Apple Support employees. The models in question first went on sale in May 2011 and were sold until October 2012. The program only affects 27-inch iMacs with 3.1GHz quad-core Intel Core i5 or 3.4GHz quad-core Intel Core i7 processors. Those models include Sandy Bridge processors and Thunderbolt ports and, according to Apple, a AMD Radeon HD 6970M card that could fail.
From the leaked memo:
Apple has determined that some AMD Radeon HD 6970M video cards used in 27-inch iMac comp
