Apple has updated the iMac with fourth generation Intel quad-core processors, new graphics, next-generation Wi-Fi, and faster PCIe flash storage options. The entry-level 21.5-inch iMac features a 2.7GHz quad-core Intel Core i5 processor and new Iris Pro graphics for unprecedented levels of integrated graphics performance. The high-end 21.5-inch model and both 27-inch models feature quad-core Intel Core i5 processors up to 3.4GHz and Nvidia GeForce 700 series graphics with twice the video memory and up to 40 percent faster performance than the previous generation.