Intel BFCBASE Data Sheet - Page 127
FSB: Front Side Bus Speed, Example
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Features 7.4.3.3.2 Offset: 16h-19h Bit 31:30 29:21 Reserved 00b-11b: Reserved Extended Family 00h-0Fh: Extended Family 21:18 Extended Model 17:16 15:14 0h-Fh: Extended Model Reserved 00b-11b: Reserved Processor Type 00b-11b: Processor Type 13:10 Processor Family 0h-Fh: Processor Family 9:6 Processor Model 0h-Fh: Processor Model 5:2 Processor Stepping 0h-Fh: Processor Stepping 1:0 Reserved 00b-11b: Reserved Description FSB: Front Side Bus Speed This location contains the front side bus frequency information. Systems may need to read this offset to decide if all installed processors support the same front side bus speed. Because the FSB is described as a 4X data bus, the frequency given in this field is 1066 MTS. The data provided is the speed, rounded to a whole number, and reflected in hex. Writes to this register have no effect. Example: The Intel® Xeon® Processor 7200 Series and 7300 Series supports a 1066 MTS front side bus. Therefore, offset 1A - 1Bh has a value of 042Ah. Offset: 1Ah-1Bh Bit 15:0 Front Side Bus Speed 0000h-FFFFh: MHz Description Document Number: 318080-002 127