Tarjeta de video 661-5969 AMD Radeon HD 6970M 2 GB para iMac 27" mediados de 2011 A1312
A1312 HD6970 1GB can be upgraded to use HD6970M 2GB. For iMac12,2 Mid 2011: MC813LL/A (2.7 GHz Core i5). For iMac12,2 Mid 2011: MC814LL/A (3.1 G Hz Core i5). For iMac12,2 Mid 2011: MC814LL/A (3.4 GHz Core i7).