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iMacs and eMacs

iMac (March 2009)

Overview

Apple has updated the iMac with nVidia graphics. The low-end iMacs use the same nVidia GeForce 9400M GPU found in all MacBook models and the new Mac mini, while the high-end iMacs use GeForce GT graphics. (ATI Radeon HD 4850 is a build-to-order option on the high-end iMacs.)

The March 2009 iMacs have 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. They support up to 8 GB of RAM.

The 20" iMac has 2 GB of RAM, a 320 GB hard drive, an 8x SuperDrive, nVidia GeForce 9400M graphics, and Apple's aluminum keyboard and Mighty Mouse. 256 MB of system RAM is dedicated to video. The 24" 2.66 GHz model includes 4 GB of RAM and a 640 GB hard drive.

The 2.93 GHz iMac replaces integrated 9400M graphics with discrete GeForce GT 120 graphics with 256 MB of dedicated VRAM; this can be replaced by Radeon HD 4850 on a build-to-order basis. The top-end 3.06 GHz iMac has a 1 TB hard drive and GT 130 graphics with 512 MB of VRAM.

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 should be good enough for most users.

2007 iMac

Intel-based Macs use a partitioning scheme known as GPT. Only Macintel models can boot from GPT hard drives. Both PowerPC and Intel Macs can boot from APM (Apple's old partitioning scheme) hard drives, which is the format you must use to create a universal boot drive in Leopard. PowerPC Macs running any version of the Mac OS prior to 10.4.2 cannot mount GPT volumes. PowerPC Macs won't let you install OS X to a USB drive or choose it as your startup volume, although there is a work around for that.

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