iMac (Mid 2007)

Apple gave the iMac a fresher look in August 2007, the first change from the stark white face introduced with the first G5 iMac three years ago. The new look puts a black border around a glossy display, has an aluminum finish, and is thinner than its predecessors.

2007 iMac

The 2007 iMac has gone aluminum.

The new iMac is thinner than the old one.

The new aluminum iMac is thinner than the old one.

Unlike the Late 2006 iMac, there is no longer a 17″ model – only 20″ and 24″ models.

Three models use a Core 2 Duo CPU (a 24″ 2.8 GHz Core 2 Extreme model was available as a build-to-order option) with the same Santa Rosa chipset and 800 MHz bus found in the current MacBook Pro models. They have three USB 2.0 ports, FireWire 400 and 800 ports, gigabit ethernet, 802.11n WiFi, and an upgraded SuperDrive – as well as a brand new slim aluminum keyboard with USB 2.0 ports.

The 20″ 2.0 GHz iMac ships with 1 GB of RAM, a 250 GB hard drive, an 8x SuperDrive, Radeon HD 2400 XT graphics, AirPort Extreme, Bluetooth 2.0, and Apple’s new keyboard and Mighty Mouse. The 2.4 GHz models ship with a 320 GB hard drive and use Radeon HD 2600 Pro graphics.

The new iMac ships with Mac OS X 10.4.10 Tiger and iLife ’08. This is the oldest iMac that supports OS X 10.9 Mavericks and 10.10 Yosemite.

The Radeon HD 2400 and 2600 Pro graphics processors, while better than the Radeon X1600 GPU in the previous generation 2.0 GHz iMacs in some respects (and worse in others) is a step down from the Nvidia GeForce 7300GT and 7600GT in the earlier 24″ iMac. Gaming benchmarks measure GeForce frame rates as anywhere from 20% to nearly 200% higher. There are also many complaints about reflections due to the glossy display.

What You Need to Know

While 1 GB of system memory is plenty to run OS X 10.4 Tiger comfortably, it is just adequate for OS X 10.5 Leopard and truly inadequate for OS X 10.6 Snow Leopard, which isn’t happy with less than 2 GB. For OS X 10.7 Lion, 2 GB is a starting point and 4 GB will make you happier. OS X 10.8 Mountain Lion and 10.9 Mavericks really call for 4 GB, and 10.10 Yosemite will want the 6 GB maximum Mid 2007 iMacs support – even though Apple says Yosemite will run with 2 GB. More RAM always makes OS X run more smoothly.

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.

Unlike earlier iMacs, where every USB port could provide 500 mA of power, only a single high-powered device can be attached to the USB ports, and software will enable one of its downstream ports to supply 500 mA of power. If a second high-powered device is attached, it will behave like a normal bus-powered hub and only provide 100 mA per downstream port.

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.


  • introduced 2007.08.07 at US$1,199 (20″ 2.0 GHz), US$1,499 (20″ 2.4 GHz), US$1,799 (24″ 2.4 GHz), and US$2,299 (2.8 GHz); discontinued 2008.04.28 and replaced by Penryn iMac.
  • Requires Mac OS X 10.4.10 or later
  • Mac OS X 10.6 Snow Leopard compatibility
    • Grand Central Dispatch is supported.
    • 64-bit operation is supported.
    • OpenCL is not supported.
  • OS X 10.8 Mountain Lion compatibility
    • AirPlay Mirroring is not supported.
    • AirDrop is not supported.
    • Power Nap is not supported.
  • OS X 10.10 Yosemite compatibility
    • AirDrop is not supported.
    • AirPlay Mirroring is not supported.
    • Handoff is not supported.
    • Instant Hotspot is not supported.
    • Power Nap is not supported.
  • CPU: 2.0/2.4 GHz Intel Core 2 Duo Merom, 2.8 GHz Core 2 Extreme option
  • Bus: 800 MHz
  • Performance:
    • Geekbench 2 (Leopard): 3614 (2.8 GHz), 3127 (2.4 GHz), 2642 (2.0 GHz)
    • Geekbench 2 (Tiger): 3740 (2.8 GHz), 3213 (2.4 GHz), 2741 (2.0 GHz)
  • RAM: 1 GB, officially expandable to 4 GB using two PC2-5300 DDR2 SODIMMs but capable of supporting 6 GB.
  • Graphics, 2.0 GHz: ATI Radeon HD 2400 XT with 128 MB RAM (256 MB optional), supports up to 1920 x 1200 external digital display, 2048 x 1536 analog display, and monitor spanning
  • Graphics, 2.4 GHz: ATI Radeon HD 2600 Pro with 256 MB RAM, supports up to 1920 x 1200 external digital display, 2048 x 1536 analog display, and monitor spanning
  • Display:
    • 20″ 1680 x 1050 flat panel display (18-bit LCD)
    • 24″ 1920 x 1200 flat panel display
  • Video out: mini-DVI, VGA, S-video, composite (requires adapter)
  • L2 cache: 4 MB shared cache on CPU
  • Hard drive bus: 3 Gbps SATA II
  • Hard drive: 250/320 GB 7200 rpm Serial ATA drive
  • Optical drive bus: UltraATA
  • SuperDrive: writes DVD±R and DVD+R discs at up to 8x speed, dual layer at up to 4x; DVD-RW at up to 6x; reads DVDs at up to 8x, writes CD-R discs at up to 24x, writes CD-RW discs at up to 16x, reads CDs at up to 24x
  • USB: 3 USB 2.0 ports, only 1 high-powered device device allowed
  • FireWire 400: 1 port, 7 Watts
  • FireWire 800: 1 port, 7 Watts
  • Modem: optional 56 kbps USB modem supports v.92
  • Ethernet: 10/100/gigabit
  • AirPort Extreme: 802.11n
  • Bluetooth 2.0: included
  • IR receiver: supports Apple Remote (included)
  • Microphone: internal
  • Power supply: 180W
  • H x W x D (20″): 18.5 x 19.1 x 7.4 in/46.9 x 48.5 x 18.9 cm
  • H x W x D (24″): 20.5 x 22.4 x 8.1 in/52.0 x 56.9 x 20.7 cm
  • weight (20″): 20 lb/9.1 kg
  • weight (24″): 25.4 lb/11.4 kg
  • Part no.: MA876 (20″ 2.0 GHz), MA877 (20″ 2.4 GHz), MA878 (24″)
  • ID: iMac7,1

CPU Upgrades

  • none

Online Resources

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One thought on “iMac (Mid 2007)

  1. Maximum RAM is actually 6 GB. You can put a 4 GB stick in slot one and a 2 GB in slot two. I have this configuration and everything is working great.