Genuine Apple Video Card for the Mid 2011 21.5 inch iMac.  This GPU  was used in the base configurations of the system.

Please note that this card may be installed as replacement for the ATI Radeon HD 6770 found in the high end configurations.   

Compatibility

21.5" Apple iMac Aluminum (Thick Edge) Mid 2011

Identifiers

iMac 12,1 A1311 - 2428 Mid 2011

Model Numbers

MC309LL/A

MC812LL/A

 Specs

Graphics

• AMD Radeon HD 6750M graphics processor with 512MB of GDDR5 memory
• 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

• Support for extended desktop and video mirroring modes