Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
The Processor Architecture Overview
24
Intel
®
 Xeon
® 
Processor E7-2800/4800/8800 v2 Product Family
Datasheet Volume Two: Functional Description, February 2014
2.1.1
Frequency
The processor cores are designed to run at a rated frequency and the architecture 
allows operating at lower frequencies in order to make appropriate power/performance 
trade-off. Along with the ability to slow down cores for power optimization, “Intel Turbo 
Boost Technology” allows the ability to increase a core’s speed to optimize single 
threaded applications.
2.1.2
Caching Hierarchy
Caching for the processor spans three levels - dedicated instruction and data cache 
(ICU and DCU), mid-level cache (MLC) for each core, and last level cache (LLC) for the 
socket.
• ICU and DCU: 32 KB each
• MLC per core: 256 KB (instructions and data)
• LLC per socket: Up to 37.5 MB (instructions and data)
— Each core slice brings 2.5 MB slices 
2.1.3
Addressing Space
The processor supports a virtual address space of 48 bits and a physical address space 
of 46 bits.
2.1.4
Multi-threaded Cores
Each core supports two threads.
2.1.5
Power Management
The processor core implements a number of energy efficiency features. Additionally, 
the processor implements a sophisticated power management scheme to throttle 
cores and the memory traffic of each memory controller independently through 
internal protocols.
2.1.6
Intel
®
 Technologies
The processor core offers several key Intel
®
 Technologies. 
 enumerates the 
key technologies implemented in the processor core. 
Table 2-1.
Technologies in the
 
Processor Core
Abbreviated Name
Short Description
GSSE
Extension of the SSE/SSE2 floating point instruction set to 256b operands.
Xsave/Xrestore
New instructions to streamline OS/VMM support for features with new state. 
Better software control over state saved, restored and initialized.
Intel
®
 Advanced Encryption 
Standard New Instructions 
(Intel
®
 AES-NI)
Speed up encryption tasks to enable broader Intel AES-NI use.
OS/VMM Features
Real mode Intel VT support. Always running timer enabling “tick-less” OS
1 GB large page support
Support for larger 1 GB pages in server applications.
Intel TXT for servers
Server-focused security technology.
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