Northwood right|thumb|180px|A 'Northwood' core Pentium 4 processor. At left is the die (black square in the center), and at right the heat spreader. thumb|Die shot of a Northwood Pentium 4 In January 2002, Intel released Pentium 4s with a new core codenamed Northwood at speeds of 1.6 GHz, 1.8 GHz, 2 GHz and 2.2 GHz.Wasson, Scott. AMD's Athlon XP 1800+ processor, Tech Report, October 9, 2001.Wasson, Scott and Brown, Andrew. Pentium 4 'Northwood' 2.2 GHz vs. Athlon XP 2000+, January 7, 2002. Northwood (product code 80532) combined an increase in the L2 cache size from 256 KB to 512 KB (increasing the transistor count from 42 million to 55 million) with a transition to a new 130 nm fabrication process. Making the processor out of smaller transistors means that it can run at higher clock speeds and produce less heat. In the same month boards utilizing the 845 chipset were released with enabled support for DDR SDRAM which provided double the bandwidth of PC133 SDRAM, and alleviated the associated high costs of using Rambus RDRAM for maximal performance with Pentium 4.
Northwood right|thumb|180px|A 'Northwood' core Pentium 4 proc,essor. At left is the die (black square in the center), and at right the heat spreader. thumb|Die shot of a Northwood Pentium 4 In January 2002, Intel released Pentium 4s with a new core codenamed Northwood at speeds of 1.6 GHz, 1.8 GHz, 2 GHz and 2.2 GHz.Wasson Scott. AMD's Athlon XP 1800+ processor, Tech Report, October 9, 2001.Wasson, Scott and Brown, Andrew. Pentium 4 'Northwood' 2.2 GHz vs. Athlon XP 2000+, January 7, 2002. Northwood (product code 80532) combined an increase in the L2 cache size from 256 KB to 512 KB (increasing the transistor count from 42 million to 55 million) with a transition to a new 130 nm fabrication process. Making the processor out of smaller transistors means that it can run at higher clock speeds and produce less heat. In the same month boards utilizing the 845 chipset were released with enabled support for DDR SDRAM which provided double the bandwidth of PC133 SDRAM, and alleviated the associated high costs of using Rambus RDRAM for maximal performance with Pentium 4.