21.5in iMac with 4K Retina display
Apple now has a 21.5in iMac with 4K Retina display to take on Windows running AIOsApple

Apple upgraded its iMac family, and finally unveiled the 4K Retina display feature on the 21.5in model, on Tuesday (October 13). Last year's 27in iMac with 5K Retina display has also been enhanced with new sixth-generation Intel Core processors.

The 21.5in iMac now sports an astonishing resolution of 4096x2304 pixels (UHD) that bring five times more pixel count than the standard 21.5in iMac display. The company has claimed that the new Retina display panels have wider P3-based colour gamut to deliver a 25% "larger colour space". This input results detailing in on-screen colours and helps in producing more life-like content.

The Cupertino giant has not provided the latest Skylake range of Intel processors on the new 21.5in iMac. Instead, there are options to choose from the fifth-generation Intel Core processors with 8GB DDR3 RAM and 1TB 5,400rpm HDD. The new iMac model has Wi-Fi 802.11ac, Bluetooth 4.0 on wireless connectivity support along with Apple OS X 10.11 EL Capitan out of the box.

Upgraded 5K Retina display featuring 27in iMac with new Intel Core processors

Apart from the new 4K iMac model, the company has upgraded last year's 27in iMac with the six-generation Intel Core processors and dedicated AMD Radeon R9 M395 graphics. The upgraded iMac model is claimed to be the fastest and the most powerful iMac, and runs OS X 10.11 EL Capitan.

The upgraded range of Apple iMac has two Thunderbolt 2 ports to deliver up to 20Gbps data transfer speeds and there are Fusion Drive options to choose high-speed storage solution in up to 3TB of hard drive and 24GB of fast flash option.

The 21.5in iMac with 4K Retina display is available for purchase at a starting price of£1,199 ($1,841) in the UK, while the upgraded 27in iMac with 5K Retina display comes with a price tag of £1,449.

New Magic devices

Apple has also unveiled the all-new Magic Keyboard, Magic Mouse 2 and Magic Trackpad 2, with improved design and built-in rechargeable lithium-ion battery.

Apple Magic accessories for iMac
Apple's new Magic accessories are designed to offer an advanced experience on OS X 10.11 EL CapitanApple

The new Magic Keyboard reportedly consumes 13% less space on your desktop and is designed with scissor mechanism and lower profile. The new Magic Mouse 2, on the other hand, features optimised foot design to deliver a smoother glide experience and the new Magic Trackpad 2 comes with Force Touch technology that debuted along with the new MacBook earlier this year. Overall, the new Magic devices have Lightning-to-USB charging cable to enable instant pairing with a Mac device and to charge the built-in batteries.