Power consumption
There are some caveats about the voltage settings of the various processors in our power consumption test that I've explained in detail before. They still apply here.

We measured the power consumption of our entire test systems, except for the monitor, at the wall outlet using a Watts Up PRO watt meter. The test rigs were all equipped with OCZ PowerStream 470W power supply units. The idle results were measured at the Windows desktop, and we used Cinebench's rendering test to load up the CPUs. For P4s, we used the multithreaded version of the test to take advantage of Hyper-Threading.

The improved halt state on the P4 570J is apparent here. At idle, the 570J consumes less power than any of the other P4 Prescott processors. In fact, its idle power consumption rivals that of the Athlon 64 4000+—at least without AMD's Cool'n'Quiet technology enabled. Unfortunately, under load, the 570J still consumes more power than any CPU we've tested.