Pentium 4 types (Codes)

List of the current revisions of the Intel Pentium 4 processor, and their differentiating characteristics.

Pentium 4 Processors, Designations, and Characteristics

Public Desig nation	Core (Intel Code name)	CPU Frequency	Frontside Bus Frequency / Theoretical Bandwidth	Cache	Additional Features
(ori- ginal rel. revi- sion)	Willamette	1.3 GHz - 2.0 GHz	100 MHz / 3.2 GB/s	8 KiB L1 data + 12 KiB L1 instruction / 256 KiB L2	N/A
P4A	Northwood	1.6 GHz - 3.0 GHz	100 MHz / 3.2 GB/s	8 KiB L1 data + 12 KiB L1 instruction / 512 KiB L2	Improved branch prediction and other microcodes tweaks; these are carried over into subsequent revisions
P4B	Northwood	2.0 GHz - 3.06 GHz	133 MHz / 4.2 GB/s	8 KiB L1 data + 12 KiB L1 instruction / 512 KiB L2	No change from P4A, except for Hyper threading in the 3.06 GHz model
P4C	Northwood	2.4 GHz - 3.4+ GHz	200 MHz / 6.4 GB/s	8 KiB L1 data + 12 KiB L1 instruction / 512 KiB L2	Hypert hreading
P4E	Prescott	2.8 GHz - 3.8+ GHz	200 MHz / 6.4 GB/s	16 KiB L1 data + 12 KiB L1 instruction / 1 MiB L2	Hypert hreading, longer pipeline, SSE3 instruc tions
P4A*	Prescott	2.4 and 2.8 GHz	133 MHz / 4.2 GB/s	16 KiB L1 data + 12 KiB L1 instruction / 1 MiB L2	No Hyper threading, longer pipeline, SSE3 instructions
Extre me Edition	Gallatin	3.2 GHz - 3.4 GHz	200 MHz / 6.4 GB/s	8 KiB L1 data + 12 KiB L1 instruction / 512 KiB L2 / 2 MiB L3	Hypert hreading, addition of on-die L3 cache
P4F	Prescott	3.2 GHz - 3.8 GHz	200 MHz / 6.4 GB/s	16 KiB L1 data + 12 KiB L1 instruction / 1 MiB L2	Support of EM64T and eXecute Disable bit (equivalent of AMD's No eXecute bit)
6xx series	Prescott 2MB**	2.8 GHz - 3.6 GHz	200 MHz / 6.4 GB/s	16 KiB L1 data + 12 KiB L1 instruction Per Core / Shared 2 MiB L2	Larger L2 cache, support of EM64T and SpeedStep
Pentium D#	Smithfield	2.8 GHz - 3.2 GHz	200 MHz / 6.4 GB/s	16 KiB L1 data + 12 KiB L1 instruction Per Core / Shared 2 MiB L2	Support of EM64T and eXecute Disable bit (equivalent of AMD's No eXecute bit) Dual Core Processor
Notes: Pentium 4 processors use a frontside bus that transfers data four times per cycle * - in the case of the budget Prescott processor line, Intel duplicated the "P4A" designation which retailers are supposed to use to identify the processor to buyers; no reason was given for this decision ** - the official core name for the 600-series, though the core is sometimes called by its Xeon equivalent, Irwindale in order to distinguish between it and the initial Prescott. # - the Pentium D consists of 2 Prescott cores on a single die.