HP Vectra XU 6/XXX HP Vectra XU 6/xxx, Guide to Optimizing performance - Page 20

Additional Advantages, of Dual Processing with, your HP Vectra PC, Limitations

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1 Your PC's Performance Features Advantages of Dual Processor Configurations Additional Advantages HP has proven experience in the successful design of dual processing of Dual Processing with PCs. Previous HP Vectra PCs have used the Pentium processor to bring your HP Vectra PC MPS-compliant multiprocessing to desktop applications. Compared with the previous generation Pentium processor, the Pentium Pro offers an additional performance advantage when used in dual processing configurations: an integrated 256 KB level-two cache memory. Cache memory increases the performance of any processor by making copies of the most frequently used data and instructions available more quickly. The Pentium and Pentium Pro processors also provide integrated, level-one cache memories of smaller capacity. With the Pentium processor, level-two cache memory was external to the processor. This meant that accesses to this memory were performed over the local bus. In dual processing configurations, this memory was shared between the two processors. The Pentium Pro integrates level-two cache memory into the same package as the processor and is able to access this memory without using the local bus. This feature leads to these additional performance advantages when the Pentium Pro processor is used in dual processing configurations: • Because the level-two cache memory is integrated inside the processor, it can be accessed at the speed of the processor's internal clock and not at the speed of the slower, local bus clock. • Accesses to the level-two cache memory do not cause accesses over the local bus and thus do not risk slowing the operation of the other processor. • Since each Pentium Pro processor integrates a level-two cache memory, dual processing configurations provide two level-two cache memories. This doubles the overall capacity of level-two cache memory in your PC. Limitations If two Pentium Pro processors are installed, they will operate at the same clock speeds. 14 English

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1
Your PC’s Performance Features
Advantages of Dual Processor Configurations
14
English
Additional Advantages
of Dual Processing with
your HP Vectra PC
HP has proven experience in the successful design of dual processing
PCs. Previous HP Vectra PCs have used the Pentium processor to bring
MPS-compliant multiprocessing to desktop applications.
Compared with the previous generation Pentium processor, the
Pentium Pro offers an additional performance advantage when used in
dual processing configurations: an integrated 256 KB level-two cache
memory.
Cache memory increases the performance of any processor by making
copies of the most frequently used data and instructions available more
quickly. The Pentium and Pentium Pro processors also provide
integrated, level-one cache memories of smaller capacity.
With the Pentium processor, level-two cache memory was external to
the processor. This meant that accesses to this memory were
performed over the local bus. In dual processing configurations, this
memory was shared between the two processors.
The Pentium Pro integrates level-two cache memory into the same
package as the processor and is able to access this memory without
using the local bus. This feature leads to these additional performance
advantages when the Pentium Pro processor is used in dual processing
configurations:
•
Because the level-two cache memory is integrated inside the
processor, it can be accessed at the speed of the processor’s internal
clock and not at the speed of the slower, local bus clock.
•
Accesses to the level-two cache memory do not cause accesses over
the local bus and thus do not risk slowing the operation of the other
processor.
•
Since each Pentium Pro processor integrates a level-two cache
memory, dual processing configurations provide two level-two cache
memories. This doubles the overall capacity of level-two cache
memory in your PC.
Limitations
If two Pentium Pro processors are installed, they will operate at the
same clock speeds.