Hardware Reference
In-Depth Information
Figure 3.28
The CPU dies for the Pentium 4 CPU based on the Willamette, Northwood, and Prescott
cores.
The main technical details for the Pentium 4 include the following:
• Speeds ranging from 1.3GHz to 3.8GHz.
• Software compatible with previous Intel 32-bit processors.
•SomeversionssupportingEM64T(64-bitextensions)andExecuteDisableBit(buffer
overflow protection).
• Processor (front side) bus that runs at 400MHz, 533MHz, 800MHz, or 1,066MHz.
• Arithmetic logic units (ALUs) that run at twice the processor core frequency.
• Hyper-pipelined (20-stage or 31-stage) technology.
• HT Technology support in all 2.4GHz and faster processors running an 800MHz bus
and all 3.06GHz and faster processors running a 533MHz bus.
• Deep out-of-order instruction execution.
• Enhanced branch prediction.
