Apple has revamped its iMac 21.5 inch and 27 inch all-in-one desktops to include quad-core processors on all models (up to a 3.4GHz Intel Core i7 for the 27 inch), Thunderbolt I/O technology (one port on the 21.5 inch, two ports on the 27 inch), faster AMD graphics and a 720p resolution FaceTime HD video camera.
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