According to Tom's Hardware Guide, Intel's dual-core CPUs are rated at a thermal design power of 130 watts, which constitutes a 13 percent increase from today's Prescott processors.
Intel and AMD claim to be able to achieve new performance highs by integrating two processor cores into one package, but all of this will not be without its additional power requirements, despite claims that this can be avoided. Now it appears that an increase of more than 13 percent over today's Pentium 4 in terms of power consumption will be likely for the Intel multi-core design. All of this translates, of course, into meatier PSUs and of course more drastic cooling.
It is likely that Smithfield processors at least will require more powerful cooling solutions than the conventional cooling fans we are used to at this time.