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 boost -- Apple claims the new version is some 50 percent faster -- and so we actually turned down the hot-rod 27-inch 2.93GHz Core i7 iMac in favor of a stock $1,199 21.5-inch Core i3 when it came time to pick up a review unit. We wanted to see just how much bang Apple's del
