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84 Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
Datasheet Volume One
3.5 Enhanced Intel SpeedStep® Technology
The processor supports Enhanced Intel SpeedStep® Technology as an advanced means
of enabling very high performance while also meeting the power-conservation needs of
the platform.
Enhanced Intel SpeedStep Technology builds upon that architecture using design
strategies that include the following:
• Separation between Voltage and Frequency Changes. By stepping voltage up
and down in small increments separately from frequency changes, the processor is
able to reduce periods of system unavailability (which occur during frequency
change). Thus, the system is able to transition between voltage and frequency
states more often, providing improved power/performance balance.
• Clock Partitioning and Recovery. The bus clock continues running during state
transition, even when the core clock and Phase-Locked Loop are stopped, which
allows logic to remain active. The core clock is also able to restart more quickly
under Enhanced Intel SpeedStep Technology.
For additional information on Enhanced Intel SpeedStep Technology see Section 4.2.1.
3.6 Intel® Intelligent Power Technology
Intel® Intelligent Power Technology conserves power while delivering advanced power-
management capabilities at the rack, group, and data center level. Providing the
highest system-level performance per watt with “Automated Low Power States” and
“Integrated Power Gates”. Improvements to this processor generation are:
• Intel Network Power Management Technology
• Intel Power Tuning Technology
For more information on Intel Intelligent Power Technology, see this link http://
www.intel.com/technology/intelligentpower/.
3.7 Intel® Advanced Vector Extensions (Intel® AVX)
Intel® Advanced Vector Extensions (Intel® AVX) is a new 256-bit vector SIMD
extension of Intel Architecture. The introduction of Intel AVX starts with the 2nd
Generation Intel(r) Core(TM) Processor Family. Intel AVX accelerates the trend of
parallel computation in general purpose applications like image, video, and audio
processing, engineering applications such as 3D modeling and analysis, scientific
simulation, and financial analysts.
Intel AVX is a comprehensive ISA extension of the Intel® 64 Architecture. The main
elements of Intel AVX are:
• Support for wider vector data (up to 256-bit) for floating-point computation.
• Efficient instruction encoding scheme that supports 3 operand syntax and
headroom for future extensions.
• Flexibility in programming environment, ranging from branch handling to relaxed
memory alignment requirements.
• New data manipulation and arithmetic compute primitives, including broadcast,
permute, fused-multiply-add, and so forth.