firstly with a core2duo the cores each run quite slowly - I was suprised when I got my e6300 each core runs at something like 1.8GHz. I was used to an AMD 4200 where it ran at quite a good speed. The core2duo comes into its own when you are multitasking it can do 2 things much faster than a single core can. When software becomes available for 2 and 4 cores things will speed up. If you are doing a single task you will not notice much difference from a pc from a couple of years ago.