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The Intel Xeon with EM64T Processor enables dual processing on HP Workstations. It features Intel's new Extended Memory 64-bit Technology as well as a modified microarchitecture. Processors with 64-bit extension technology fully support existing IA-32 features and existing IA-32 software while enabling the ability to access 64-bit linear addressing for 64-bit applications when running a 64-bit capable operating system.
Specilized Features: Single Device Data Correction Extended 64-bit registers enables 64-bit flat linear addressing Eight new General Purpose Registers (R8-R15) Eight new 128-bit streaming SIMD Extensions 64-bit-wide GPRs and instruction pointers (RIP) Enhanced Machine Check State Registers Quad-pumping Compatible with existing 32-bit applications with running in Legacy Mode Virtual 64-bit addressing 13 new instructions (including new Single Instruction Multiple Data SSE3 instructions) Maximum Virtual Memory: Up to 16 exabytes Platforms with Intel EM64T can run in three different modes*: Legacy: A 32-bit operation mode that allows the processor to work with 16 or 32-bit data, so enabling it to execute 32-bit applications with a 32-bit address space. No 64-bit features are available. When running a 32-bit OS, EM64T-capable processors will only operate in this mode. Compatibility: This enables 16 and 32-bit applications to run on a 64-bit operating system. In this mode, only 4 GB of address space is available to the application, but the OS continues to run in 64-bit mode. This enables both 64-bit and 32-bit applications to run concurrently. There is no apparent performance penalty because also the processor is switching modes, the application continues to use the same instructions it would have used on a 32-bit architecture. 64-bit: This is enabled when a 64-bit OS is executing a recompiled 64-bit application. It enables the full 64-bit features of the processor. *64-bit capable BIOS is required for all three