Intel® Core™ Processor (Series 3)

Formerly known as Wildcat Lake, Datasheet, Volume 1 of 2

ID Date Version Classification
913965 05/19/2026 001 Public
Document Table of Contents
RFM

CPUID

CPUID Format

SKU

CPUID

Reserved

[31:28]

Extended Family

[27:20]

Extended Model

[19:16]

Reserved

[15:14]

Processor Type

[13:12]

Family Code

[11:8]

Model Number

[7:4]

Stepping ID

[3:0]

6C A1 Step

D0651h

0000b

0000000b

1101b

00b

00b

0110b

0101b

0001b

  • 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 Intel® Core™ processor family.
  • 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.
  • 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.
  • 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.
  • The Stepping ID in Bits [3:0] indicates the revision number of that model.

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.