The iMac spots all-new quad-core processors, Advanced graphics, Thunderbolt technology, FaceTime HD. iMac is a desktop that is regarded to some as a workhorse disguised as an all-in-one wonder. Below are some of its features:
Full brightness with no waiting. That’s the advantage of the LED-backlit of the iMac display. Unlike displays that take time to warm up before they reach maximum brightness, an LED-backlit display comes on instantly and it is uniformly bright. LED backlighting also lets you finely tune the iMac display to suit the ambient light in even the dimmest room.
More pixels:The 21.5-inch iMac features 1920-by-1080 resolution. The 27-inch iMac boasts even greater resolution of 2560-by-1440. That’s a whopping 78 percent more pixels than
the 21.5-inch model. And more pixels mean you get a better display because the images look crisp and true to life. A 1000:1 contrast ratio gives you more vibrant colors and blacker blacks. All in a 16:9 aspect ratio — the same as an HDTV.
Stunning from every angle:The iMac display looks great from any seat in the house due to its premium display technology called in-plane switching (IPS). IPS gives you a bright picture with excellent color — even if you’re viewing the display from the side. Isn't that cool....
Next-generation quad-core Intel processors:The new iMac is powered by quad-core processors, that's Apple's fastest yet — up to 70 percent faster than the previous generation. Every model in the lineup comes standard with the latest Intel Core i5 quad-core processor. You even have the option to configure the 21.5- or 27-inch iMac with the Intel Core i7, the fastest quad-core processor available. You can even add up to 16GB of DDR3 memory and an ultrafast 256GB solid-state drive, and you’ve got an all-in-one that can handle just about anything.
All-new advanced AMD Radeon HD graphics:With advanced AMD Radeon HD graphics processors across the line, iMac performs even better than before — up to three times better. So you see more frames per second in 3D games, and you can edit HD home videos with more speed and responsiveness than you ever thought was possible.
Magic Mouse or Magic Trackpad:
All the info and more can be found at the Apple's site