This version of the Intel® Processor Frequency ID Utility is recommended for use with the Intel® Pentium® M, Intel Xeon™, Intel Xeon processor MP, Pentium 4 processor Extreme Edition, Pentium 4, Mobile Pentium 4, Pentium III processors, Mobile Pentium III processors with Intel SpeedStep™ technology, Pentium III Xeon, Intel Celeron®, Celeron M and mobile Celeron processors. Each of the products listed above have multiple system memory bus speeds that are also supported including 66, 100, 133, 400, 533 and 800 MHz system memory bus products.