The 2.5GHz modls are planned to ship in July, while models with two 1.8GHz and two 2.0GHz processors are available for launch immediately.
Apple introduced the system about a year ago and previously the least expensive model had only 1 1.6 gigahertz microprocessor. The system prices now start at $1,999 and run to $2,999, while the previous range began at $1,799.Source: Reuters