Hammer is 64 bit processor and is aimed to compete with Intel Itanium.
The real competitors to the P4 will be the Palomino (the Athlon 4) thats just out, and then the Thoroughbred and Bartons.
I dont think Thoroughbred and Barton will have any major architectural improvements over Thunderbird, but will be done with advanced manufacturing processes like 0.13 micron and SOI. There are no details out yet, maybe they will be improve some L1/L2 cache, add MP support alongwith fine tuning of existing architechtures. Newer manufacturing processes only mean faster and cooler processors.
Then, on the Duron front they have the Morgan, and then 0.13 micron Appaloosa (whatever that means). Now even a value processor like Duron is expected to cross 1G!
girish
<font color=blue>die-hard fans don't have heat-sinks!</font color=blue>