What that article doesn't mention is the benefit you get in Windows itself from multiple cores. If you do a lot of multitasking then you certainly do notice a difference. I'm running a Core i7 (which is effectively 8 core, with Hyperthreading) for my main rig, and a Core 2 Duo for my secondary rig, and I really do notice a difference. The only thing that can max out the i7 are apps which are designed to do so, such as Prime95 and OCCT. In normal use, nothing at all comes close to maxing out all 4 cores, thus everything is very responsive. On the C2D rig, both cores do sometimes get maxed out, resulting in the usual thumb-twiddling waiting periods.