new intel processor - worth to upgrade?

Core usage is reported in Compilation Report, Flow Elapsed Time. I get e.g. a 1.4 - 1.7 average usage during Fitter operation with a dual core. Thus providing two cores actually has some effect. A stronger effect would be by parallelization, either of different projects, or modules within a project, which requires writing batch commands. But it's true, that fast clock and fast memory (FSB speed) has the strongest impact.