Apple has refreshed its line of iMacs and launched a version of its 21.5in all-in-one desktop computer with a 4K Retina display.
Apple also revealed it will give all its 27in iMacs 5K screens by default, building upon the introduction of the iMac with 5K Retina display it launched last year.
The 4K version of the 21.5in iMac spots a hefty screen resolution of 4096x2304, a considerable upgrade over 1920x1080 high resolution displays offered by cheaper models in the range.
While unchanged from the outside, Apple has also given the innards of its entire 21.5in iMac range an overhaul.
They all sport Intel's Broadwell processors, with the cheapest model including a 1.6GHz dual-core i5 chip, while the 4K version has a heftier 3.1GHz quad-core variant of the i5, which can use the chipmaker's Turbo Boost to spin the processor up to 3.6GHz.
Power users can opt to upgrade the 4K iMac to the faster Intel Core i7 chip which clocks in at 3.3GHz, with the potential to boost to 3.8GHz.
Interestingly, Apple has opted for Intel's fifth generation Broadwell processors, rather than its latest Skylake chips.
This is because the Sklylake processors, unlike their Broadwell predecessors, do not feature Intel's Iris Pro on board graphics which are needed to power the iMac's 4K display.
The on-board memory of the entry-level iMacs has been upgraded from the 8GB of 1600MHz DDR3 found in earlier models to 8GB of faster 1867GHz DDR3. Those after more RAM can opt to double the memory to 16GB.
Storage is offered in the form of a 1TB 5400 rpm hard drive by default for all the 21.5in iMacs, but can be upgraded to use Apple's Fusion Drive, which tops out at 2TB or 512GB of solid state storage for the 4K model.
Prices for the entry-level 21.5in iMac start at £899, with the mid-range model configurable from £1,049, and the range-topping 4K Retina Display version beginning at £1,199.
5K by default
Apple has made the 5K 5012x2280 resolution of its top-end 27in iMac the default for its range of larger screened all-in-one computers.
This has had the knock-on effect of lowering prices for the 5K iMac from a lofty £2,000 down to a more affordable starting price of £1,449.
Unlike the 21.5in models, the refresh of the 27in iMacs has seen Apple adopt Intel's latest Skylake processors using them in combination with dedicated graphics chips to power the 5K displays.
Configurations for processors start at 3.5GHz quad-core i5 chips go on up to the quad-core i7 versions, with a speed of 4GHz.
The AMD Radeon R9 handles the graphics for the larger iMacs, starting with the 2GB M380 which the option to specify the M395X version of the GPU, which comes with 4GB of video memory.
On-board memory starts at 8GB of 1867MHz DDR3 and can be upgraded up to 32GB, while storage runs from an entry-level 1TB hard drive up to the top end 2TB Fusion Drive or 1TB of flash storage, though that comes at a £500 premium.
Both the 21.5in and 27in range of iMacs feature two Thunderbolt 2 ports for 20Gbps of data transfer and 802.11ac WiFi to support up to 1.3Gbps of wireless connectivity.
They also come with Apple's redesigned Magic Keyboard and Magic Mouse 2 or Magic Trackpad. These new peripherals can be charged through Apple's Lightning cable, thus removing the need to find a pair if AA batteries when they start to run out of power.
The new range of iMacs follows a busy schedule of releases by Apple, with the company having revealed the iPhone 6s in September, along with announcing the iPad Pro.
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