Intel X3330 Specification Update - Page 15

Component Identification Information The Intel® Xeon® Processor 3300 Series can be identified by the following values: Reserved 31:28 Extended Family1 27:20 00000000b Extended Model2 19:16 0001b Reserved 15:14 Processor Type3 13:12 00b Family Code4 11:8 0110b Model Number5 7:4 0111b Stepping ID6 3:0 XXXXb When EAX is initialized to a value of 1, the CPUID instruction returns the Extended Family, Extended Model, Type, Family, Model and Stepping value in the EAX register. Note that the EDX processor signature value after reset is equivalent to the processor signature output value in the EAX register. Notes: 1. The Extended Family, bits [27:20] are used in conjunction with the Family Code, specified in bits [11:8], to indicate whether the processor belongs to the Intel386, Intel486, Pentium, Pentium Pro, Pentium 4, Intel® CoreTM, or Enhanced Intel® CoreTM processor family. 2. The Extended Model, bits [19:16] in conjunction with the Model Number, specified in bits [7:4], are used to identify the model of the processor within the processor's family. 3. The Processor Type, specified in bits [13:12] indicates whether the processor is an original OEM processor or a Dual CPU Socket system. 4. The Family Code corresponds to bits [11:8] of the EDX register after RESET, bits [11:8] of the EAX register after the CPUID instruction is executed with a 1 in the EAX register, and the generation field of the Device ID register accessible through Boundary Scan. 5. The Model Number corresponds to bits [7:4] of the EDX register after RESET, bits [7:4] of the EAX register after the CPUID instruction is executed with a 1 in the EAX register, and the model field of the Device ID register accessible through Boundary Scan. 6. The Stepping ID in bits [3:0] indicates the revision number of that model. See Table 2, "Intel® Xeon® Processor 3300 Series Identification Information" for the processor stepping ID number in the CPUID information. Cache and TLB descriptor parameters are provided in the EAX, EBX, ECX and EDX registers after the CPUID instruction is executed with a 2 in the EAX register. Refer to the Intel Processor Identification and the CPUID Instruction Application Note (AP-485) for further information on the CPUID instruction. Intel® Xeon® Processor 3300 Series 15 Specification Update January 2012