iMac Intel 21.5" Emc 2428 Radeon Hd 6750 Graphics Card

replace an amd radeon hd 6750 graphics card in a model a1311 mid 2011 21.5" imac (mc309ll/a configuration). 512 mb gddr5 this is a used oem part. compatibility imac intel 21.5" a1311 emc 2428 mid 2011 specifications part #: 661-5945 warranty one year warranty apple lab. adc empire plaza, 2nd floor. 183, satmosjid road, 12/a, dhanmondi dhaka-1205