The base 2.5 GHz 21.5″ model has AMD Radeon HD 6750M graphics with 512 MB of dedicated memory. The 2.7 GHz 21.5″ and 27″ models use Radeon 6770M graphics with 512 MB of video memory, and the top-end 3.1 GHz 27″ iMac has Radeon 6970M graphics with 1 GB of video memory (expandable to 2 GB). The Mid 2011 iMacs have 4 USB 2.0 ports, FireWire 800 (which is backward compatible with 400), gigabit ethernet, 802.11n WiFi, Bluetooth 2.1+EDR, an SDXC Card slot, and an 8x SuperDrive. External graphics card for imac 2011 Bluetooth# Intel-based Macs use a partitioning scheme known as GPT. Only Macintel models can boot from GPT hard drives.
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