Intel invested heavily in P4 and made the P4 pipeline really long which allowed for higher clocks. So for Banias started with the P3 pipeline which was already

Intel invested heavily in P4 and made the P4 pipeline really long which allowed for higher clocks. So for Banias started with the P3 pipeline which was already short and added the microop fusion that I believe was introduced in P4. As well a cribbing a lot of other enhancements from Netburst. It's been several years since I read up on it so I'm rust on all the details.