The Radeon HD 24 Pro graphics processors, while better than the Radeon X1600 GPU in the 2.0 GHz Late 2006 iMacs, are in some respects a step down from the Nvidia GeForce 7300GT and 7600GT in the 24″ Late 2006 iMac. These iMacs support OS X 10.11 El Capitan. The new iMac ships with OS X 10.5.2 Leopard and iLife ’08. The 2.66 GHz and faster models ship with 2 GB of RAM, a 320 GB hard drive, and use Radeon HD 2600 Pro graphics (Nvidia GeForce 8800 is a built-to-order option on the 24″ iMac). The 20″ 2.0 GHz iMac has 1 GB of RAM, a 250 GB hard drive, an 8x SuperDrive, Radeon HD 2400 XT graphics, AirPort Extreme, Bluetooth, and Apple’s aluminum keyboard and Mighty Mouse. This was the last iMac to use an Ultra ATA interface for its optical drive. The aluminum iMacs have three USB 2.0 ports, FireWire 400 and 800 ports, gigabit ethernet, 802.11n WiFi, Bluetooth 2.1+EDR, and an 8x SuperDrive – as well as a slim keyboard with USB 2.0 ports. The Early 2008 iMac also moved from the 800 MHz system bus in the Mid 2007 iMac to 1066 MHz, and clock speeds now range from 2.4 GHz to all the way up to a 3.06 GHz build-to-order option. Apple updated the iMac with Intel’s more efficient Penryn processor in April 2008, which has a larger Level 2 cache and includes the SSE4.1 instruction set.
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