Willamette
Willamette, the first Pentium 4 with the initial 1.3, 1.4 and 1.5GHz was released in competition to AMD Athlon. The core was produced using a 0.18 micrometer (180 nm) process and initially utilized socket 423 on motherboards. However, the later revisions moved on to socket 478. Though reasonably priced it was handicapped by the requirement of relatively expensive Rambus Dynamic RAM (RDRAM ). Pentium III was retained as Intel's top selling chip. Athlon also sold somewhat better than Pentium 4.
The first P4 to provide a tough challenge to its rival Athlon Thunderbird was the 2.0 GHz.
