Apple has introduced a new desktop iMac with a 27-inch Retina display.

At 5120 x 2880, the company calls it the 5K Retina display and claims that it is the world's highest resolution desktop display screen. Saying that it has seven times more pixels than a 1080p monitor or TV.

The iMac's screen is also just 5mm thin. Plus, the entry level version houses a 3.5GHz quad-core Intel i5 processor, but can be upgraded to run on a 4GHz quad-core Intel i7 processor.

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The graphics chips can also be upgraded. The entry machine comes with an AMD Radeon R9 M290X GPU, while the extended version can have an AMD Radeon R9 M295X.

Thunderbolt 2 is on board with Fusion Drive as standard. And the price of the new iMac with Retina display starts at $2,499. It ships from today (16 October).

Apple is still selling the regular iMac desktop computers too, with the 21.5-inch iMac priced at $1,099 in the US, with the 27-inch version without the 5K Retina display costing $1,799.