Originally posted by: ShotgunEd
I dont understand? why did intel downgrade from p3 to p4?
They changed the architecture, to enable them to get to much higher clock speeds, as "GHz sells". They have improved the architecture slightly, but as well they made longer "pipelines", so that higher clock speed, but at the expense of IPC (instructions per clock).
Also, OldSpooky is getting the P3-m and the Pentium-M mixed up I think

The 1GHz P3 is about the same as a 1.3/1.4 P4, but it's the Pentium-M, aka Banias, aka Centrino that the 1.3GHz is about a 1.7GHz P4-m
Check out the Anandtech articles on the P4, and the P-M, for all the differences between the architectures
Confused