Features        AMD Athlon™ 64 Processor       Pentium® 4           Architecture Introduction   2004 2006   2000           Infrastructure   Socket 939 Socket AM2   Socket 478, Socket LGA775           Process Technology   90 nanometer, SOI   90 nanometer           Number of Transistors   Approximately 77 to 114 Million (939-pin) Approximately 81 million (socket AM2)   125 Million           64-bit Instruction Set Support   Yes, AMD64 technology   Depends, EM64T on some Pentium® 4 series           32-bit Instruction Set Support   Yes   Yes           Enhanced Virus Protection for Windows® XP SP2*   Yes   Depends           System Bus Technology   HyperTransport™ technology up to 2000MHz Full duplex   Front Side Bus up to 1066 MHz, Half duplex           Integrated DDR Memory Controller (MCT)   128-bit + 16-bit ECC unbuffered PC3200, PC 2700, PC 2100, or PC1600 128-bit + 16-bit ECC unbuffered PC2 6400 (DDR2-800), PC2 5300(DDR2-667), PC2 4200(DDR2-533), PC2 3200(DDR2-400)   No, Discrete logic device on motherboard           Total Processor-to-System Bandwidth   HyperTransport: up to 8.0 GB/s Memory bandwidth: up to 6.4 GB/s Total: up to 14.4 GB/s HyperTransport: up to 8.0 GB/s Memory bandwidth: up to 10.6 GB/s Total: up to 18.6 GB/s   Total: up to 8.5 GB/s           Integrated Northbridge   Yes, 128-bit data path @ CPU core frequency   No, Discrete logic device on motherboard           High-Performance, On-chip Cache   L1: 128KB L2: 1024KB, or 512k(exclusive) Total Effective Cache: 640K or 1152KB L1: 128KB L2: 512k(exclusive) Total Effective Cache: 640K   L1: 12K µop trace + 8KB data L2: 1 or 2MB (inclusive) Total Effective Cache: 1 or 2MB           3D and Multimedia Instructions   3DNow!™ Professional technology, SSE2, SSE3   SSE, SSE2, SSE3

* Enhanced Virus Protection (EVP) is only enabled by certain operating systems including the current versions of Microsoft® Windows®, Linux®, Solaris and BSD Unix. After properly installing the appropriate operating system release, users must enable the protection of their applications and associated files from buffer overrun attacks. Consult your OS documentation for information on enabling EVP. Contact your application software vendor for information regarding use of the application in conjunction with EVP. AMD strongly recommends that users continue to use third party anti-virus software as part of their security strategy.

© 2006 Advanced Micro Devices, Inc. AMD, the AMD Arrow logo, AMD Athlon, 3DNow!, and combinations thereof, are trademarks of Advanced Micro Devices, Inc. HyperTransport is a licensed trademark of the HyperTransport Technology Consortium. Linux is a registered trademark of Linus Torvalds. Microsoft and Windows are registered trademarks of Microsoft Corporation in the U.S. and/or other jurisdictions. Other names are for informational purposes only and may be trademarks of their respective owners.