Update: Apple has issued an EFI firmware update for the new machines, to cure a black-screen issue when using Boot Camp while both an external optical drive and USB thumb drive are connected.

Apple has launched an updated line of iMacs with faster processors, improved graphics, faster 802.11ac WiFi connectivity, and improved Flash storage. The new iMacs are now available from Apple’s online store.

“iMac continues to be the example that proves how beautiful, fast and fun a desktop computer can be,” said Philip Schiller, Apple’s senior vice president of Worldwide Marketing. “Inside its ultra-thin aluminum enclosure, the new iMac has the latest Intel processors, faster graphics, next generation 802.11ac Wi-Fi and faster PCIe flash storage.”

The new iMacs, like the MacBook Airs that launched in June, include Intel Haswell processors.

However, the iMac’s chips are all quad-core across the board, for both the 21.5-inch and 27-inch configurations:

The entry-level 21.5-inch iMac features a 2.7 GHz 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 3.4 GHz and NVIDIA GeForce 700 series graphics with twice the video memory and up to 40 percent faster performance than the previous generation.* Customers looking for the ultimate in performance can upgrade to quad-core Intel Core i7 processors up to 3.5 GHz and NVIDIA GeForce GTX 780M series graphics with up to 4GB of video memory.

The new iMacs also include improvements to flash storage and the Fusion Drive:

The updated iMac now features support for PCIe-based flash storage that makes Fusion Drive and all-flash storage options up to 50 percent faster than the previous generation.* The popular Fusion Drive option combines the large storage capacity of a hard drive with the high performance of flash to deliver shorter boot times and faster access to apps and files. Customers can configure their iMac with a 1TB or 3TB Fusion Drive, and all-flash storage options are now available in configurations up to 1TB. iMac comes standard with 8GB of memory and a 1TB hard drive, and customers can choose to configure their iMac with up to 32GB of memory and up to a 3TB hard drive. iMac also comes with two Thunderbolt and four USB 3.0 ports for connecting to external storage and other high performance peripherals.

Sources say that the new iMacs will be available at Apple Stores beginning Thursday.

Full press release below:

CUPERTINO, Calif.–(BUSINESS WIRE)–Apple® today updated iMac® with fourth generation Intel quad-core processors, new graphics, next generation Wi-Fi and faster PCIe flash storage options. The updated iMac brings the latest technology to the stunningly thin design and gorgeous display of the world’s leading all-in-one desktop.

“Inside its ultra-thin aluminum enclosure, the new iMac has the latest Intel processors, faster graphics, next generation 802.11ac Wi-Fi and faster PCIe flash storage.”

“iMac continues to be the example that proves how beautiful, fast and fun a desktop computer can be,” said Philip Schiller, Apple’s senior vice president of Worldwide Marketing. “Inside its ultra-thin aluminum enclosure, the new iMac has the latest Intel processors, faster graphics, next generation 802.11ac Wi-Fi and faster PCIe flash storage.”

The entry-level 21.5-inch iMac features a 2.7 GHz 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 3.4 GHz and NVIDIA GeForce 700 series graphics with twice the video memory and up to 40 percent faster performance than the previous generation.* Customers looking for the ultimate in performance can upgrade to quad-core Intel Core i7 processors up to 3.5 GHz and NVIDIA GeForce GTX 780M series graphics with up to 4GB of video memory.

iMac now supports next generation 802.11ac Wi-Fi. When connected to an 802.11ac base station, iMac delivers wireless performance that is up to three times faster than the previous generation.

The updated iMac now features support for PCIe-based flash storage that makes Fusion Drive and all-flash storage options up to 50 percent faster than the previous generation.* The popular Fusion Drive option combines the large storage capacity of a hard drive with the high performance of flash to deliver shorter boot times and faster access to apps and files. Customers can configure their iMac with a 1TB or 3TB Fusion Drive, and all-flash storage options are now available in configurations up to 1TB.

iMac comes standard with 8GB of memory and a 1TB hard drive, and customers can choose to configure their iMac with up to 32GB of memory and up to a 3TB hard drive. iMac also comes with two Thunderbolt and four USB 3.0 ports for connecting to external storage and other high performance peripherals.

Continuing Apple’s commitment to energy efficiency and the environment, iMac meets stringent Energy Star 5.2 requirements and achieves an EPEAT Gold rating.** iMac features LED-backlit displays that are mercury-free and made with arsenic-free glass. iMac includes PVC-free components and cables, contains no brominated flame retardants, and uses highly recyclable materials and material-efficient packaging designs.

iMac ships with OS X® Mountain Lion, bringing Messages, Notification Center, system-wide Sharing, AirPlay® Mirroring, Dictation, Game Center and the enhanced security of Gatekeeper to your Mac®. With iCloud® built into the foundation of OS X, Mountain Lion makes it easier than ever to keep your content up to date across your Mac, iPhone®, iPad® and iPod touch®.

Pricing & Availability

The new iMac is available today through the Apple Online Store (www.apple.com), Apple’s retail stores and select Apple Authorized Resellers. The 21.5-inch iMac is available with a 2.7 GHz quad-core Intel Core i5 with Turbo Boost speeds up to 3.2 GHz and Intel Iris Pro for a suggested retail price of $1,299 (US); and with a 2.9 GHz quad-core Intel Core i5 with Turbo Boost speeds up to 3.6 GHz and NVIDIA GeForce GT 750M for a suggested retail price of $1,499 (US). The 27-inch iMac is available with a 3.2 GHz quad-core Intel Core i5 with Turbo Boost speeds up to 3.6 GHz and NVIDIA GeForce GTX 755M for a suggested retail price of $1,799 (US); and with a 3.4 GHz quad-core Intel Core i5 with Turbo Boost speeds up to 3.8 GHz and NVIDIA GeForce GTX 775M for a suggested retail price of $1,999 (US). Additional technical specifications, configure-to-order options and accessories are available online at www.apple.com/imac.

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