Compaq Armada 6500 Deschutes Family Processor Technology - Page 5

Pentium II / IA32 Architecture - pro

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ECG050/0698 7(&+12/2*< %5,() (cont.) ... Pentium II / IA32 Architecture Both the Deschutes Pentium II and Pentium II Xeon processors use the same basic architecture as previous Pentium II processors. The Deschutes family continues the same IA32 technology line; it is fully software compatible with all previous Pentium Pro and Pentium II processors. Like the Pentium Pro and Pentium II, the Deschutes family uses Dynamic Execution techniques and a dual independent bus structure. The dual independent bus structure provides a separate independent bus between the processor core logic and the secondary L2 cache. See the technology brief Pentium II Processor Technology, document number ECG046.0897 for more details on the IA32 architecture and the Pentium II. 350-, 400-, and 450-MHz Processor Frequency Full-featured Deschutes Pentium II processors were introduced in April '98 with 350- and 400MHz versions, with future enhancements expected to increase to 450 MHz. These frequency increases should provide a direct performance boost to CPU-intensive applications. 100-MHz GTL+ System Bus Another performance enhancement is the move from the current 66-MHz GTL+ bus used by the Pentium Pro and Klamath Pentium II processors to a faster 100-MHz GTL+ bus. This provides a faster pipeline between the processor and main memory, and between the processor and system peripherals. Slot 1 Cartridge The Deschutes Pentium II processor comes in the same Slot 1 cartridge used in previous Pentium II processors. Due in part to this form factor, the Deschutes Pentium II processor is still limited to no more than 2P SMP configurations. 4-GB Cacheable Address Space Deschutes Pentium II processors are able to access up to 4 GB of system memory. The Klamath Pentium II only accesses up to 512 MB of cacheable memory. This memory size limitation is one of the key reasons that previous Pentium II products have not been deployed into memory-intensive environments such as online transaction processing and other database applications that sometimes use up to 2 GB or more of memory. Note: While the processor will be able to support 4 GB of system memory, the actual maximum for the system may be less, depending on the memory chipset and number of available memory sockets. MMX Technology Like previous Pentium II processors, the Deschutes Pentium II processor supports MMX instructions. MMX instructions allow certain applications to operate on multiple data locations with a single instruction call to the processor. The MMX functions are primarily used in multimedia applications such as audio and video manipulation; however, increasing numbers of specialized business applications are being written to take advantage of MMX capabilities. 

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Pentium II / IA32 Architecture
Both the Deschutes Pentium II and Pentium II Xeon processors use the same basic architecture as
previous Pentium II processors.
The Deschutes family continues the same IA32 technology line; it
is fully software compatible with all previous Pentium Pro and Pentium II processors.
Like the
Pentium Pro and Pentium II, the Deschutes family uses Dynamic Execution techniques and a dual
independent bus structure.
The dual independent bus structure provides a separate independent bus
between the processor core logic and the secondary L2 cache.
See the technology brief
Pentium II
Processor Technology
, document number ECG046.0897 for more details on the IA32
architecture and the Pentium II.
350-, 400-, and 450-MHz Processor Frequency
Full-featured Deschutes Pentium II processors were introduced in April ’98 with 350- and 400-
MHz versions, with future enhancements expected to increase to 450 MHz.
These frequency
increases should provide a direct performance boost to CPU-intensive applications.
100-MHz GTL+ System Bus
Another performance enhancement is the move from the current 66-MHz GTL+ bus used by the
Pentium Pro and Klamath Pentium II processors to a faster 100-MHz GTL+ bus.
This provides a
faster pipeline between the processor and main memory, and between the processor and system
peripherals.
Slot 1 Cartridge
The Deschutes Pentium II processor comes in the same Slot 1 cartridge used in previous Pentium II
processors.
Due in part to this form factor, the Deschutes Pentium II processor is still limited to no
more than 2P SMP configurations.
4-GB Cacheable Address Space
Deschutes Pentium II processors are able to access up to 4 GB of system memory.
The Klamath
Pentium II only accesses up to 512 MB of cacheable memory.
This memory size limitation is one
of the key reasons that previous Pentium II products have not been deployed into memory-intensive
environments such as online transaction processing and other database applications that sometimes
use up to 2 GB or more of memory.
Note:
While the processor will be able to support 4 GB of system memory, the actual maximum
for the system may be less, depending on the memory chipset and number of available memory
sockets.
MMX Technology
Like previous Pentium II processors, the Deschutes Pentium II processor supports MMX
instructions.
MMX instructions allow certain applications to operate on multiple data locations
with a single instruction call to the processor.
The MMX functions are primarily used in
multimedia applications such as audio and video manipulation; however, increasing numbers of
specialized business applications are being written to take advantage of MMX capabilities.