You'd have to frame that question a little tighter to answer it. If you had 4 apps, each loading the CPU cores (e.g not off doing an I/O fetch which puts very little load on the CPU) and the core speeds of both CPUs were the same, then yes, you'd see nearly a doubling of performance. However, if the two core CPU was twice as fast as the four core CPU, then you'd see very similar performance for both.In what situations do you take advantage of multiple cores? Will a CPU with 4 cores be twice as fast as a dual core CPU when 4 or more programs are running?