New LED-backlit Display
The LED-backlit display is instantly on, uniformly bright and easy to fine tune to your preference. With 17 percent more pixels than the previous 20 inch iMac, the 21.5 inch has a resolution of 1920 by 1080 and at a stunning 78 percent more, the 27 inch boasts 2560 by 1440 resolution. Thanks to in-plane switching, the display has excellent colour consistency even when viewed from the side.
Wireless Keyboard and Magic Mouse
Banish desktop clutter with a wireless keyboard and wireless Magic Mouse. The keyboard is low-profile, stylish and 24 percent smaller than larger keyboards with built in Bluetooth, so no cables to connect. The Magic Mouse is the world's first Multi-Touch mouse with no scroll ball, clunky wheel, cord or visible button. Its smooth, seamless design is ambidextrous and supports two-button clicking - without buttons. It also features one finger, 360 degree scrolling and screen zoom and two finger swiping.
Quad_core
Whilst the 21.5 inch and 27 inch iMac offer fast Intel Core 2 Duo processors up to 3.33GHz, the 27 inch model is also available with quad-core power. This gives up to 2x faster performance especially since Mac OS X Snow Leopard is designed to take full advantage of Intel dual and quad-core architecture.