Power consumption of AMD64x2 vs Pentium IV D: they seem to be comparable - both at about 110W maximum. Both AMD and Intel support dynamically clocking down. AMD claims that power consumption for the Atlon64x2 at its lowest clock rate is less than half of the P4 at its lowest clock rate. The heat issue is one of the reasons both Intel and AMD have gone the multicore road. A 10% increase in clock speed can result in a 30% heat increase. Running two cores at about 70% of the clock speed of a single core generates about the same amount of heat, while increasing performance (best case) by 40-50%. So I guess the heat generated by a P4 D 2.8 Ghz would be roughly equal to the heat generated by an ordinary P4 at 3.5 Ghz. Just a guess. By the way, the cores of the Athlon64x2 each have their own lane to the main memory, while the P4 D relies on a single northbridge. The AMD has a much higher maximum data transfer rate between CPU and main memory than the P4.

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