1. 512MB graphics card board for iMac A1311 A1312 2010 2011 HD6770 HD6750 109-C29557-00. 2. Replace your broken or unusable item with a new one. 3. Each item has been checked and in good condition before shipping. 4. Completely fit and work. 5. Professional installation is highly recommended. We will not be responsible for any damages to your device that you may cause during the changing of replacement parts.
