Preface 
 
 
6     Specification Update 
Volume 3A: System Programming Guide 
Intel® 64 and IA-32 Architecture Software Developer’s Manual, 
Volume 3B: System Programming Guide 
IA-32 Intel® Architecture Optimization Reference Manual 
Intel Processor Identification and the CPUID Instruction Application 
Note (AP-485) 
Intel® 64 and IA-32 Architectures Application Note TLBs, Paging-
Structure Caches, and Their Invalidation 
NOTE:  Contact your Intel representative for the latest revision. 
Nomenclature 
Errata are design defects or errors. These may cause the processor behavior to deviate 
from published specifications. Hardware and software designed to be used with any given 
stepping must assume that all errata documented for that stepping are present on all 
devices. 
S-Spec Number is a five-digit code used to identify products. Products are differentiated 
by their unique characteristics, e.g., core speed, L2 cache size, package type, etc. as 
described in the processor identification information table. Read all notes associated with 
each S-Spec number. 
Specification Changes are modifications to the current published specifications. These 
changes will be incorporated in any new release of the specification. 
Specification Clarifications describe a specification in greater detail or further highlight 
a specification‟s impact to a complex design situation. These clarifications will be 
incorporated in any new release of the specification. 
Documentation Changes include typos, errors, or omissions from the current published 
specifications. These will be incorporated in any new release of the specification. 
Note:  Errata remain in the specification update throughout the product‟s lifecycle, or until a 
particular stepping is no longer commercially available. Under these circumstances, 
errata removed from the specification update are archived and available upon request. 
Specification changes, specification clarifications and documentation changes are 
removed from the specification update when the appropriate changes are made to the 
appropriate product specification or user documentation (datasheets, manuals, etc.).