Dual-core processors, What do you think of them?

Well, a dual 2.8, for example, -IS- a 2.8, but dual does not mean 2.8 + 2.8 = 5.6 Dual-core 2.8 means that it does just what you said. It multitasks. You have multiple cores doing what a single core would do, but at the same speed as a single. So, Upgrading from a 2.8 from a dual 2.8 wouldn't make your web browser work faster, but it would, however, allow you to more effectively perform OTHER tasks while using your web browser, such as listen to music, or run an antivirus.

Yes thats true that they have less clock speed. but they are much faster than that of single core processors as two processors work simultaneously..

Even the speed not as fast as they told us, but I think this dual core is much faster than P4, also I heard dual core consume more power which that mean more heat.