if people are still using single core processors today, years after the p4 got up to 3.0ghz, and not having major problems, and are still even able to run the high majority of applications without a hitch... what's to stop you from *not* upgrading every 6 months without problems? sure, the duo to quad core leap came fast... but look at how long it took for single to duo. and even now with the dual core out for a few years, applications are just now starting to take advantage of it. I belive a duo is still viable and the quad is more of a server/business rendering processor.