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Intel® Processor Numbers
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Intel® Pentium® 4 processor Intel® Pentium® 4 processor
 
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Processor
Number		 Architecture Cache Clock
Speed		 Front
Side
Bus		 HT
Technology†		 Enhanced
Intel
SpeedStep®
Technology‡		 Intel®
64Φ		 Execute
Disable
Bit°
670 90 nm 2 MB L2 3.80 GHz 800 MHz
661 65 nm 2 MB L2 3.60 GHz 800 MHz
660 90 nm 2 MB L2 3.60 GHz 800 MHz
651 65 nm 2 MB L2 3.40 GHz 800 MHz
650 90 nm 2 MB L2 3.40 GHz 800 MHz
641 65 nm 2 MB L2 3.20 GHz 800 MHz
640 90 nm 2 MB L2 3.20 GHz 800 MHz
631 65 nm 2 MB L2 3 GHz 800 MHz
630 90 nm 2 MB L2 3 GHz 800 MHz
551 90 nm 1 MB L2 3.40 GHz 800 MHz  
541 90 nm 1 MB L2 3.20 GHz 800 MHz  
531 90 nm 1 MB L2 3 GHz 800 MHz  
524 90 nm 1 MB L2 3.06 GHz 533 MHz  
521 90 nm 1 MB L2 2.80 GHz 800 MHz  

† Look for systems with the Intel® Pentium® 4 Processor with HT Technology logo which your system vendor has verified utilize Hyper-Threading Technology. Performance will vary depending on the specific hardware and software you use. See www.intel.com/products/ht/hyperthreading_more.htm for information.

‡ Not all specified units of this processor support Enhanced Intel SpeedStep® Technology. See the Processor Spec Finder at processorfinder.intel.com or contact your Intel representative for more information.

Φ 64-bit computing on Intel® architecture requires a computer system with a processor, chipset, BIOS, operating system, device drivers and applications enabled for Intel® 64 architecture. Processors will not operate (including 32-bit operation) without an Intel 64 architecture-enabled BIOS. Performance will vary depending on your hardware and software configurations. Consult with your system vendor for more information.

° Enabling Execute Disable Bit functionality requires a PC with a processor with Execute Disable Bit capability and a supporting operating system. Check with your PC manufacturer on whether your system delivers Execute Disable Bit functionality.