![]() Only Macintel models can boot from GPT hard drives. Intel-based Macs use a partitioning scheme known as GPT. This should be good enough for most users. Note that 20″ aluminum iMacs use an 18-bit LCD, which can only display 262,144 colors, not the “millions” all other iMacs can display. This iMac shipped with OS X 10.5.6 Leopard, and it can run OS X 10.11 El Capitan. This 2.0 GHz iMac sells for US$250 less than the 2.66 GHz Early 2009 20″ model with 2 GB of RAM and a 320 GB hard drive. 256 MB of system RAM is dedicated to video. ![]() The 20″ iMac ships with Apple’s aluminum keyboard and Mighty Mouse. The Mid 2009 iMac has 4 USB 2.0 ports (one more than before), FireWire 800 (but not 400), gigabit ethernet, 802.11n WiFi, Bluetooth 2.1+EDR, and an 8x SuperDrive – as well as a slim keyboard with two USB 2.0 ports. It has the same Nvidia GeForce 9400M graphics. ![]() At 2.0 GHz, the new education iMac is 25% slower than the low-end consumer model and comes with half the RAM (1 GB) and half as big a hard drive (160 GB). Apple has finally replaced the last 17″ iMac, a holdover white model that has only been available to the education market at the same US$899 price as this new model. ![]()
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