The 21.5-inch iMac now starts with a 2.7GHz, quad-core Intel Core i5 processor and new Iris Pro graphics. The 21.5-inch is also available with an i5 processor with up to 3.4GHz and Nvidia GeForce 700 series graphics.
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The 27-inch model comes with a 3.2GHz quad-core processor and Nvidia GeForce 700 graphics or a 3.4GHz CPU.
Users can also purchase the 3.5GHz processor and Nvidia GeForce GTX 780M series graphics with up to 4GB of video memory.
All iMacs now support the 802.11ac Wi-Fi standard and start with 8GB of memory and a 1TB hard drive. They can be upgraded to up to 32GB of memory and a hard drive with up to 3TB of storage.
The cheapest 21.5-inch iMac costs $1,299, while the model with a 2.9GHz processor and Nvidia GeForce GT 750M graphics will set you back $1,499.
The 27-inch iMac with a 3.2 GHz quad-core Intel Core i5 CPU and an Nvidia GeForce GTX 755M graphics card goes for $1,799; the version with a 3.4 GHz CPU costs $1,999.
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