PC Hardware in a Nutshell, 3rd Edition

Pentium 4 processor variants

Intel has produced Pentium 4 processors using two cores, the 0.18μ Willamette core and the 0.13μ Northwood core; two form factors, the 423-pin PGA-423 (Socket 423) and the smaller 478-pin mPGA-478 (Socket 478); and three FSB speeds, 400 MHz, 533 MHz, and 800 MHz:

Willamette-core processors

Willamette-core Pentium 4 processors have 256 KB of eight-way set associative L2 cache and use the 400 MHz FSB. Intel has produced Willamette-core processors for Socket 423 and Socket 478 at core speeds of 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, and 2 GHz. Willamette-core processors have 42 million transistors and a die size of 217 square millimeters.

Northwood-core processors

Northwood-core Pentium 4 processors have 512 KB of eight-way set associative L2 cache and use the 400, 533, or 800 MHz FSB. Intel has produced Northwood-core processors only for Socket 478 at core speeds of 1.6, 1.8, 2.0, 2.2., 2.26, 2.4, 2.5, 2.53, 2.6, 2.67, 2.8, 3.0, 3.06, and 3.2 GHz, with faster variants planned for release later in 2003. Northwood-core processors have 55 million transistors. The original Northwood core used a die size of 146 square millimeters, which in July 2002 was reduced to 131 square millimeters. Although Northwood-core processors dissipate less heat than Willamette-core processors running at the same speed, the smaller die size means the heat dissipated per unit surface area is actually higher. Northwood-core processors, particularly fast ones, accordingly require ...