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The range is powered by Intel Core 2 Duo processors running up to 2.8GHz with 4MB of shared L2 cache and up to 4GB of 667 MHz DDR2 SDRAM memory. Each model has either the ATI Radeon HD 2600 PRO with 256MB of GDDR3 memory and the ATI Radeon HD 2400 XT with 128MB of GDDR3 memory. And internal hard drive storage now goes up to 1TB while the maximum memory is now 4GB.

AirPort Extreme 802.11n Wi-Fi networking is now standard, as are Gigabit Ethernet, three USB 2.0 ports (plus two on the keyboard) and one FireWire 400 and one FireWire 800 port. All models have a CD and (double-layer) DVD burning 8x SuperDrive.

The use of glass and aluminium makes the Mac highly recyclable,

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and it also meets the new Energy Star 4.0 requirements for power efficiency.

"This new iMac is the most incredible desktop computer we've ever made," said Steve Jobs, Apple's CEO. "Our new design features the innovative use of materials, including professional-grade aluminium and glass, that are highly recyclable."

The iMac range comprises four models, with the following core specification. Each can be custom-configured with additional memory, storage and accessories including a Bluetooth, wireless version of the new keyboard and a wireless mouse.

20in 2.0GHz Intel Core 2 Duo | 1GB memory | 250GB hard drive | ATI Radeon HD 2400 XT with 128MB memory - £799

20in 2.4GHz Intel Core 2 Duo | 1GB memory | 320GB hard drive | ATI Radeon HD 2600 PRO with 256MB memory - £949;

24in 2.4GHz Intel Core 2 Duo | 1GB memory | 320GB hard drive | ATI Radeon HD 2600 PRO with 256MB memory - £1,149;

24in 2.8GHz Intel Core 2 Extreme | 2GB memory | 500GB hard drive | ATI Radeon HD 2600 PRO with 256MB memory - £1,459.

All four models will be ready to ship within five to eight days and include the new iLife '08 software suite. For more information go to apple.com/uk/imac.