Intel 253668-032US User Manual
Vol. 3 19-5
ARCHITECTURE COMPATIBILITY
19.10 INTEL
HYPER-THREADING
TECHNOLOGY
Intel Hyper-Threading Technology provides two logical processors that can execute
two separate code streams (called threads) concurrently by using shared resources
in a single processor core or in a physical package.
This feature was introduced in the Intel Xeon processor MP and later steppings of the
Intel Xeon processor, and Pentium 4 processors supporting Intel Hyper-Threading
Technology. The feature is also found in the Pentium processor Extreme Edition. See
also: Section 8.7, “Intel
two separate code streams (called threads) concurrently by using shared resources
in a single processor core or in a physical package.
This feature was introduced in the Intel Xeon processor MP and later steppings of the
Intel Xeon processor, and Pentium 4 processors supporting Intel Hyper-Threading
Technology. The feature is also found in the Pentium processor Extreme Edition. See
also: Section 8.7, “Intel
Intel Atom processors also support Intel Hyper-Threading Technology.
19.11 MULTI-CORE
TECHNOLOGY
The Pentium D processor and Pentium processor Extreme Edition provide two
processor cores in each physical processor package. See also: Section 8.5, “Intel
processor cores in each physical processor package. See also: Section 8.5, “Intel
“Multi-Core Architecture.” Intel Core 2 Duo, Intel Pentium Dual-Core processors,
Intel Xeon processors 3000, 3100, 5100, 5200 series provide two processor cores in
each physical processor package. Intel Core 2 Extreme, Intel Core 2 Quad proces-
sors, Intel Xeon processors 3200, 3300, 5300, 5400, 7300 series provide two
processor cores in each physical processor package.
Intel Xeon processors 3000, 3100, 5100, 5200 series provide two processor cores in
each physical processor package. Intel Core 2 Extreme, Intel Core 2 Quad proces-
sors, Intel Xeon processors 3200, 3300, 5300, 5400, 7300 series provide two
processor cores in each physical processor package.
19.12 SPECIFIC FEATURES OF DUAL-CORE PROCESSOR
Dual-core processors may have some processor-specific features. Use CPUID feature
flags to detect the availability features. Note the following:
flags to detect the availability features. Note the following:
•
CPUID Brand String — On Pentium processor Extreme Edition, the process will
report the correct brand string only after the correct microcode updates are
loaded.
report the correct brand string only after the correct microcode updates are
loaded.
•
Enhanced Intel SpeedStep Technology — This feature is supported in
Pentium D processor but not in Pentium processor Extreme Edition.
Pentium D processor but not in Pentium processor Extreme Edition.
19.13 NEW
INSTRUCTIONS
IN THE PENTIUM AND LATER
IA-32 PROCESSORS
Table 19-1 identifies the instructions introduced into the IA-32 in the Pentium
processor and later IA-32 processors.
processor and later IA-32 processors.