The
NetBurst microarchitecture, called
P68 inside
Intel, was the successor to the
P6 microarchitecture in the
x86 family of
CPUs made by Intel. The first CPU to use this architecture was the
Willamette-core Pentium 4, released on November 20, 2000 and the first of the
Pentium 4 CPUs; all subsequent Pentium 4 and
Pentium D variants have also been based on NetBurst. In mid-2001, Intel released the
Foster core, which was also based on NetBurst, thus switching the
Xeon CPUs to the new architecture as well. Pentium 4-based
Celeron CPUs also use the NetBurst architecture.