A day after introducing upgraded versions of the iPad Air and iPad mini, Apple Inc. today refreshed yet another product line that it hasn’t updated in a while.  

The company is launching five new configurations of its popular iMac all-in-one desktop computer that range from $1,099 to $2,299. They come in the same form factors as the previous iteration of the machine, which debuted just under two years ago, but feature heavily upgraded internals that make them significantly faster.

The 21.5-inch iMac offers up to 60 percent more performance thanks to a pair of new processor options. Users can order the machine with a quad-core Intel Core i3 processor that runs at a frequency of 3.6 gigahertz, or a six-core Intel Core i5 that has a lower 3GHz base speed but is capable of reaching up to 4.1GHz when necessary. Apple has also included new Radeon Pro graphics cards from Advanced Micro Devices Inc. that it said provide up to 80 more processing power for visually intensive applications.

Both versions of the 21.5-inch iMac come with 1 terabyte of storage, 8 gigabytes of DDR4 memory and the option to upgrade to 32 gigabytes. For consumers that need even more hardware capacity, Apple has also introduced three new configurations of the pricier 27-inch iMac.

The machines sport six-core Core i5 processors with base frequencies ranging from 3.0GHz to 3.7GHz. The chips in the two lower-end models are based on Intel’s eighth-generation processor architecture, while the top-end 3.7GhZ edition uses the latest ninth-generation design and provides as much as 240 percent more processing power than previous iMacs. Apple also promises up to 50 percent better graphics performance thanks to new Radeon Pro graphics cards.

All three variants of the 27-inch iMac include 8 gigabytes memory by default, but consumers can optionally bump that up to as much as 64 gigabytes depending on which model they order. Storage capacities range from 1 to 2 terabytes.

Alongside these upgrades, Apple has quietly introduced new configuration options for the iMac Pro, a more expensive version of the all-in-one computer geared toward power users such as graphic designers. The machine can now be ordered with a massive 256 gigabytes of memory, or eight times the amount in a fully upgraded 27-inch iMac. Apple now also offers AMD’s high-end Radeon Pro Vega 64X graphics card as an upgrade option.

Photo: Apple