The 64-bit extension technology is an enhancement to Intel IA-32 architecture. An IA-32 processor equipped with 64-bit extension technology:
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Is compatible with existing IA-32 software
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Enables future software to access larger memory address space
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Allows co-existence of software written for 32-bit linear address space with software capable ofaccessing 64-bit linear address space.
In the 64-bit sub-mode of 64-bit extension technology, applications can access the following features:
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64-bit flat linear addressing
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8 new General-Purpose Registers (GPRs)
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8 new registers for Streaming SIMD Extensions (SSE, SSE2 and SSE3)
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64-bit-wide GPRs and instruction pointers
Enhanced Intel Speedstep
Frequently Asked Questions from the Intel website:
http://www.intel.com/support/processors/xeon/sb/cs-012641.htm
Q. What is Enhanced Intel Speedstep Technology?
A. Enhanced Intel Speedstep Technology allows the system to dynamically adjust processor voltage and core frequency, which results in decreased power consumption, which results in decreased heat production, which in turn allows improved acoustics because fans do not need to spin as quickly.
Q. Is Enhanced Intel Speedstep Technology compatible with Intel Hyper-Threading Technology?
A. Yes. The operating system sees two virtual processors. Requests to change the power state are prioritized between each virtual processor by the BIOS and the operating system; the power state will default to that of the virtual processor requesting the highest states.