Apple has introduced its biggest-ever iMac – the new 20-inch 1.25GHz G4 iMac.

It sports the largest flat-panel display ever offered in an all-in-one desktop. The new model supplements Apple's existing 15- and 17-inch iMacs, but offers twice as much screen area as the 15-inch display – users can view more than two A4 pages, side-by-side and the screen offers a 1,680-x-1,050 resolution.

The new consumer desktop Mac ships with Mac OS X 10.3 Panther pre-installed, and will be on exhibit at Apple's stand at MacExpo 2003 this week.

Apple's senior vice president worldwide product marketing Phil Schiller said: "The new iMac builds on the revolutionary, all-in-one, adjustable design that remains unmatched in the industry. By offering a huge, gorgeous 20-inch widescreen display, Apple has once again raised the bar on what customers can expect from an all-in-one desktop."

Apple describes the screen of the new iMac as "appearing to float in mid-air". Like all the models in the range, the screens height and angle can be adjusted with a single touch.

The new iMac offers two FireWire400 and three USB 2.0 ports. Airport Extreme-ready, customers can choose to have Bluetooth built into the new Mac as a build-to-order option.

The new big-screen iMac also includes a 4x SuperDrive (DVD-R/CD-RW) optical drive.

Like the 17-inch iMac, the 20-inch model offers a 1.25GHz G4 processor and ships with 256MB 333MHz memory and an 80GB, 7,200rpm hard drive. Both 17- and 20-inch iMacs ship with NVidia's GeForce FX 5200 Ultra graphics processor with 64MB of DDR video memory

The software bundle includes Apple's iLife applications – iTunes 4, iPhoto 2, iMovie 3 and iDVD 3. A selection of other titles are also included with the product, though the UK software bundle has not yet been announced.

The 20-inch iMac's UK price is set at £1,749.00; prices of the other products in the range appear unchanged.