Apple iMac 21.5" A1311 Mid-2011 ATI Radeon HD 6770 512MB Video Card

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Replacement Video Card for the Mid 2011 21.5" iMac.  This part was used in the MC812LL/A model which was the top range iMac for mid 2011.

Please note that this card may be installed as replacement / Upgrade for the AMD Radeon HD 6750M Video Cardwhich was standard on the MC309LL/A entry level model.   

21.5" Apple iMac Aluminum (Thick Edge) Mid 2011


iMac 12,1 A1311 - 2428 Mid 2011

Model Numbers



  • AMD Radeon HD 6770M graphics processor with 512MB of GDDR5 memory
  • Mini DisplayPort output with support for DVI, VGA, and dual-link DVI (adapters sold separately)
  • Support for extended desktop and video mirroring modes
  • Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display

All our products are covered by our own 60 day warranty.  If a problem arises we want to work through the situation with you.  Happy customers are the way we continue to grow and we are here to help.

Our Process 

  • Identify the problem by assisting with a diagnoses and trouble shooting.
  • Determine the best way to resolve the issue.  Our preferred method is to replace the defective item whenever possible.
  • We do ask to share the cost of shipping, we will pay for outbound shipping and ask our customers to cover inbound shipping costs
  • If we cannot send a replacement we will issue a refund for the original purchase price less any shipping costs.

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