Apple today announced an updated line of iMacs. The new series is the first to completely drop Core 2 Duo as an option, instead offering dual-core Core i3 or i5 at the lower end; higher-end systems have a choice of quad-core Core i5 or i7. Dual-core CPUs are now rated up to 3.6GHz, whereas quad-core speeds have been boosted slightly to 2.93GHz.
