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CPUID: History, EAX=0: Highest Function Parameter and Manufacturer ID & CPU-specific information outside x86

In the x86 architecture, the CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from "CPU Identification") allowing software to discover details of the processor. It was introduced by Intel in 1993 with the launch of the Pentium and late 486 processors.

Language: English [EN]
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CPUID topic overview

The analysis highlights History, EAX=0: Highest Function Parameter and Manufacturer ID and CPU-specific information outside x86 as prominent areas in the source structure around CPUID. 1 topic appears in more than one source area, which can help identify connections that are less obvious in a linear reading.

Related topics
109
Source areas
30
Connected nodes
140
Extracted relationships
228
Concept neighborhoods
45
Bridge connections
140

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

EAX=0: Highest Function Parameter and Manufacturer ID · 30 topics
CPU-specific information outside x86 · 11 topics
Overview · 9 topics
EAX=4000'0000h-4FFFF'FFFh: Reserved for Hypervisors · 6 topics
EAX=4 and EAX=Bh: Intel Thread/Core and Cache Topology · 5 topics
Calling CPUID · 4 topics
EAX=17h: SoC Vendor Attribute Enumeration · 4 topics
EAX=1: Processor Info and Feature Bits · 4 topics
History · 4 topics
CPUID usage from high-level languages · 3 topics
EAX=0Dh: XSAVE Features and State Components · 3 topics
EAX=15h and EAX=16h: CPU, TSC, Bus and Core Crystal Clock Frequencies · 3 topics
EAX=2: Cache and TLB Descriptor Information · 3 topics
EAX=3: Processor Serial Number · 2 topics
EAX=4 and EAX=8000'001Dh: Cache Hierarchy and Topology · 2 topics
EAX=8000'0001h: Extended Processor Info and Feature Bits · 2 topics
EAX=8FFF'FFFEh and EAX=8FFF'FFFFh: AMD Easter Eggs · 2 topics
EAX=12h: SGX Capabilities · 1 topics
EAX=14h: Processor Trace · 1 topics
EAX=18h: TLB Hierarchy and Topology · 1 topics
EAX=1Eh: Intel AMX Tile Multiplier (TMUL) Information · 1 topics
EAX=2000'0000h: Highest Xeon Phi Function Implemented · 1 topics
EAX=21h: Reserved for TDX enumeration · 1 topics
EAX=8000'0002h,8000'0003h,8000'0004h: Processor Brand String · 1 topics
EAX=8000'0007h: Processor Power Management Information and RAS Capabilities · 1 topics
EAX=8000'000Ah: SVM features · 1 topics
EAX=8C86'0000h: Hygon Extended Feature Flags · 1 topics
EAX=C000'0000h: Highest Centaur Extended Function · 1 topics
EAX=C000'0001h: Centaur Feature Information · 1 topics
EAX=C000'0002h: Centaur Extended CPUID Performance Data · 1 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

History

Calling CPUID

EAX=0: Highest Function Parameter and Manufacturer ID

EAX=1: Processor Info and Feature Bits

EAX=2: Cache and TLB Descriptor Information

EAX=3: Processor Serial Number

EAX=4 and EAX=8000'001Dh: Cache Hierarchy and Topology

EAX=4 and EAX=Bh: Intel Thread/Core and Cache Topology

EAX=0Dh: XSAVE Features and State Components

EAX=12h: SGX Capabilities

EAX=14h: Processor Trace

EAX=15h and EAX=16h: CPU, TSC, Bus and Core Crystal Clock Frequencies

EAX=17h: SoC Vendor Attribute Enumeration

EAX=18h: TLB Hierarchy and Topology

EAX=1Eh: Intel AMX Tile Multiplier (TMUL) Information

  • AMX Advanced Matrix Extensions

EAX=21h: Reserved for TDX enumeration

EAX=2000'0000h: Highest Xeon Phi Function Implemented

EAX=4000'0000h-4FFFF'FFFh: Reserved for Hypervisors

EAX=8000'0001h: Extended Processor Info and Feature Bits

EAX=8000'0002h,8000'0003h,8000'0004h: Processor Brand String

EAX=8000'0007h: Processor Power Management Information and RAS Capabilities

EAX=8000'000Ah: SVM features

EAX=8C86'0000h: Hygon Extended Feature Flags

EAX=8FFF'FFFEh and EAX=8FFF'FFFFh: AMD Easter Eggs

  • Easter egg Easter egg (media)
  • DEI House system at the California Institute of Technology

EAX=C000'0000h: Highest Centaur Extended Function

EAX=C000'0001h: Centaur Feature Information

EAX=C000'0002h: Centaur Extended CPUID Performance Data

CPUID usage from high-level languages

CPU-specific information outside x86

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How CPUID connects Entity context

The extracted context around CPUID shows recurring relationship patterns in the source. For example, CPUID → AMD64 Architecture Programmer's Manual, Application Note, CLFLUSHOPT, Contains, CPUID Instruction, For, General-Purpose, IA-32 Architectures Software Developer's, Instruction Latency, Intel, Intel ISA, Intel Processor Identification, ISA, July, June, Linuxcpuprint, Manual, May, Memory Latency, Said Another extracted example is CPUID → Architecture, Architecture IBM, ARM, Configuration Registers, CPU, EL1, PrId, Processor Identification, Processor Version Register, PVR, Some, STFL, STFLE, STIDP, Store CPU ID, Store Facilities List, Store Facilities List Extended, System/370, The, The MIPS32/64. Use these groups to spot repeated connection types before inspecting the individual relationships.

CPUID

Top relations

related to External links · 24
CPUID → AMD64 Architecture Programmer's Manual, Application Note, CLFLUSHOPT, Contains, CPUID Instruction, For, General-Purpose, IA-32 Architectures Software Developer's, Instruction Latency, Intel, Intel ISA, Intel Processor Identification, ISA, July, June, Linuxcpuprint, Manual, May, Memory Latency, Said
related to CPU-specific information outside x86 · 22
CPUID → Architecture, Architecture IBM, ARM, Configuration Registers, CPU, EL1, PrId, Processor Identification, Processor Version Register, PVR, Some, STFL, STFLE, STIDP, Store CPU ID, Store Facilities List, Store Facilities List Extended, System/370, The, The MIPS32/64
related to EAX=21h: Reserved for TDX enumeration · 16
CPUID → ASCII, CPU, EAX/EBX/ECX/EDX, EBX, ECX, EDX, ID, Intel's, IntelTDX, TD, TDX, TDX-specificTDCALLinstruction, This, Trust Domain, Trust Domain Extensions, When Intel TDX
related to EAX=3: Processor Serial Number · 14
CPUID → AMD CPUs, CPU, CPUs, Crusoe, EAX, ECX, EDX, For Intel Pentium III, Intel Pentium III, Processor Serial Number, PSN, The, This, Transmeta's Efficeon
related to EAX=4000'0000h-4FFFF'FFFh: Reserved for Hypervisors · 14
CPUID → AMD-v, CPUIDleaves40000000hto4FFFFFFFhare, EAX, EBX, ECX, EDX, For, Hv, Hyper-V, Hypervisors, ID, Intel VT-x, The, When
related to EAX=8000'0002h,8000'0003h,8000'0004h: Processor Brand String · 14
CPUID → AMD Ryzen, ASCII, CPU, CPUIDmust, DM, EAX, EBX, ECX, EDX, Intel/AMD, It, The, These, Vortex86DX3
related to EAX=2: Cache and TLB Descriptor Information · 13
CPUID → EAX, EAX/EBX/ECX/EDX, EBX, ECX, EDX, FFhindicates, On, The, There, These, This, TLB, TLBs
related to EAX=4 and EAX=8000'001Dh: Cache Hierarchy and Topology · 12
CPUID → AMD, CPU, EAX, EBX, ECX, EDX, In, Intel, Leaf4is, The, These, They
related to EAX=8FFF'FFFEh and EAX=8FFF'FFFFh: AMD Easter Eggs · 12
CPUID → Additionally, AMD K6 CPUs, DEI, Easter, EAX, EBX, ECX, EDX, FFFEh, FFFFh, Known Easter Egg, Several AMD CPU
related to EAX=4 and EAX=Bh: Intel Thread/Core and Cache Topology · 11
CPUID → Additional, Although, AMD, As, Bh, ECX, EDX, Intel, The, These, Unlike

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

eax information ecx processor leaf edx ebx intel processors cpu id returns feature amd returned string also return bits used

CPUID relationships Subject–Predicate–Object triples

TTTA extracted 228 structured relationships around CPUID. Examples in this analysis include MMX/SSE are implemented → instance of → It was introduced by Intel in 1993 with the launch of the Pentium and late 486 processors.A program can use theCPUIDto determine processor type and whether features and CPUID → related to Calling CPUID → TheCPUIDopcode. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
MMX/SSE are implementedinstance ofIt was introduced by Intel in 1993 with the launch of the Pentium and late 486 processors.A program can use theCPUIDto determine processor type and whether features0.80text
CPUIDrelated to Calling CPUIDTheCPUIDopcode0.60section
CPUIDrelated to Calling CPUIDA20.60section
CPUIDrelated to Calling CPUIDProcessor0.60section
CPUIDrelated to Calling CPUIDID0.60section
CPUIDrelated to Calling CPUIDEFLAGS0.60section
CPUIDrelated to Calling CPUIDIn0.60section
CPUIDrelated to Calling CPUIDEAX0.60section
CPUIDrelated to Calling CPUIDIn Intel's0.60section
CPUIDrelated to Calling CPUIDCPUIDshould0.60section
CPUIDrelated to Calling CPUIDCPU0.60section
CPUIDrelated to CPU-specific information outside x86Some0.60section

Related concept clusters Concept neighborhoods

The concept neighborhoods around CPUID bring nearby vocabulary together. In this analysis, examples include Processor, Eax and Intel. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • CPUID
    • Processor
    • Eax
    • Intel
    • Processors
    • Information
    • Also
    • Return
    • Returned
    • Instruction
    • Ecx
    • Amd
    • Core
  • cpuid
    • Processor
    • Eax
    • Intel
    • Processors
    • Information
    • Also
    • Return
    • Returned
    • Instruction
    • Ecx
    • Amd
    • Core
  • processor supplementary instruction
    • Processors
    • Returned
    • Processor
    • String
    • Leaf
    • Used
    • Provides
    • Register
    • Cpus
    • Edx
    • Also
    • Information
  • cpu
    • Amd
    • String
    • Information
    • Instruction
    • Set
    • Ecx
    • Cpus
    • Edx
    • Eax
    • Leaf
    • Register
    • Feature
  • intel
    • Processor
    • String
    • Amd
    • Cpus
    • Processors
    • Feature
    • Number
    • Used
    • Also
    • Returned
    • Eax
    • Ecx
  • amd
    • String
    • Intel
    • Cpus
    • Return
    • Cpu
    • Also
    • Processors
    • Ebx
    • Core
    • Cpuid
    • Id
    • Edx
  • amd k5
    • String
    • Intel
    • Cpus
    • Return
    • Cpu
    • Also
    • Processors
    • Ebx
    • Core
    • Cpuid
    • Id
    • Edx
  • soft cpu cores
    • Amd
    • String
    • Information
    • Instruction
    • Set
    • Ecx
    • Cpus
    • Edx
    • Eax
    • Leaf
    • Register
    • Feature

Connections between topic areas Semantic bridges

For CPUID, one of the stronger structural bridges in this analysis connects CPUID with EAX=0: Highest Function Parameter and Manufacturer ID. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
CPUID — EAX=0: Highest Function Parameter and Manufacturer ID · splits 110 ⟂ 31
CPUID — CPU-specific information outside x86 · splits 129 ⟂ 12
CPUID — Overview · splits 131 ⟂ 10
CPUID — EAX=4000'0000h-4FFFF'FFFh: Reserved for Hypervisors · splits 134 ⟂ 7
CPUID — EAX=4 and EAX=Bh: Intel Thread/Core and Cache Topology · splits 135 ⟂ 6
CPUID — History · splits 136 ⟂ 5
CPUID — Calling CPUID · splits 136 ⟂ 5
CPUID — EAX=1: Processor Info and Feature Bits · splits 136 ⟂ 5
CPUID — EAX=17h: SoC Vendor Attribute Enumeration · splits 136 ⟂ 5
CPUID — EAX=2: Cache and TLB Descriptor Information · splits 137 ⟂ 4
CPUID — EAX=0Dh: XSAVE Features and State Components · splits 137 ⟂ 4
CPUID — EAX=15h and EAX=16h: CPU, TSC, Bus and Core Crystal Clock Frequencies · splits 137 ⟂ 4
CPUID — CPUID usage from high-level languages · splits 137 ⟂ 4
CPUID — EAX=3: Processor Serial Number · splits 138 ⟂ 3
CPUID — EAX=4 and EAX=8000'001Dh: Cache Hierarchy and Topology · splits 138 ⟂ 3
CPUID — EAX=8000'0001h: Extended Processor Info and Feature Bits · splits 138 ⟂ 3
CPUID — EAX=8FFF'FFFEh and EAX=8FFF'FFFFh: AMD Easter Eggs · splits 138 ⟂ 3

Map overview Semantic statistics

CPUID

Nodes141
Edges140
Triples228
Avg. degree1.99
Density0.014184
Components1

Source & methodology

TTTA analyzes the structure around CPUID to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History, EAX=0: Highest Function Parameter and Manufacturer ID & CPU-specific information outside x86, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — CPUID · EN edition · Analysis: TopicsToTalkAbout

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