http://www.eetimes.com/semi/news/OEG20030219S0033Intel said the 90-nm processor due for release late this year will sport process and design improvements that will help Intel crank the Pentium up to a 5-GHz frequency.
I also found a summary of changes in Prescott
http://www.xbitlabs.com/news/story.html?id=1045703066
16KB L1 Cache (doubles that on current P4 while preserving 2 cycle latency)
1MB L2 Cache (also doubles that on current P4)
800MHz system bus
13 total new instructions (codenamed PNI, may become SSE3):
1 x FP to integer conversions
5 x Complex Arthimetic
1 x Video Encoding
4 x SIMD FP using AOS format
2 x Thread synchronization
Reduced latency on integer multiplies (imul)
Additional write combining (WC) buffers
Improved pre-fetching / branch prediction algorithm (further reduce penalty of long pipeline)
Improved Hyperthreading ("Hyperthreading 2")
Uses Springdale and Canterwood dual channel DDR400 platforms
~100 million transistors built on 90nm process
Frequencies up to 5GHz
