There's nothing outwardly different about the new iMacs Apple just released last Tuesday, but the hardware underneath that familiar aluminum chassis has gotten faster -- particularly on the low end, where a new 3.06GHz Intel Core i3 processor and discrete ATI Radeon HD 4670 graphics chip have taken over for the previous gen's 3.06GHz Core 2 Duo and integrated NVIDIA GeForce 9400m. That's a big boo
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