PCI Express, according to the publicly available specs, might well require two power rails for everything to proceed hunky-dory. One other thing. Intel is keeping as quiet about its 2004 plans to its Taiwanese "partners" as it is to the gentlefolk of the press.Source: The Inquirer
Taiwanese Prescott motherboards able to handle 150W processors

Prescott motherboards from Taiwanese motherboards makers will be able to handle processors that draw up to 150 watts, just in case, so they aren't caught by Intel his recklessness if future Prescott processors like 3.8GHz models draw a lot more power than expected.