Intel constantly keeps pushing the technology limits- if not by raw speed then either by introducing new architecture like DDR2 and PCI-E interfaces on desktop boards, or, by shrinking the die sizes. The switch to 90nm process was a bit of a bitter-sweet step for Intel as they introduced the Prescott with its 31-stage pipeline- up from the 20-stage pipeline of the Northwood CPU. However, with the move to 65nm, there is no change in architecture at all which should theoretically translate in smaller die sizes, lower power consumption and higher clock frequencies.