Original used 256M graphics card specifically designed for the iMac 21.5″ A1311 models. This top-notch component is 100% tested for optimum performance and serves as an ideal replacement for a faulty or outdated card. Featuring the HD4670 chipset, it provides exceptional graphics processing power for stunning visuals and seamless performance. Backed by a 3-month warranty, this graphics card ensures reliability and peace of mind.