HP ProLiant SL165s Memory technology evolution: an overview of system memory t - Page 18

Importance of using HP-certified memory modules in ProLiant servers, Conclusion

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Importance of using HP-certified memory modules in ProLiant servers There are several reasons why you should use only HP memory option kits to replace or add memory in ProLiant servers. First, not all DIMMs are created equal. They can vary greatly in quality and reliability. In the highly competitive memory market, some third-party memory resellers forego the level of qualification and testing needed for servers because it adds to the price of DIMMs. We use proprietary diagnostic tools and specialized server memory diagnostic tests that exceed industry standards to ensure the highest level of performance and availability for HP ProLiant servers. The cost related to system downtime, data loss, and reduced productivity caused by lower quality memory is far greater than the price difference between HPcertified memory and third party DIMMs. Second, HP offers three levels of AMP that go beyond error correction to increase fault tolerance. These AMP technologies-Online Spare Memory, Mirrored Memory, and Lockstep Memory-are optimized for each server series. For ProLiant servers with AMP, the AMP mode you select determines the DIMM configuration. HP memory option kits ensure correct configuration for each AMP mode. Third, using HP memory option kits prevents improper mixing of single-, dual-, and quad-rank DIMMs. Although DIMMs of different ranks may have the same capacity, they differ in the way the memory controller accesses them. To ensure that the server boots properly and operates reliably, each channel's DIMM load should be consistent. HP memory option kits precisely match the capabilities and requirements of the designated ProLiant server. To find the correct HP memory option kit, consult the server's user guide or the product QuickSpecs available at www.hp.com. Conclusion The constant need to boost memory performance for increasingly powerful system processors drives the development of advanced memory technologies. At HP, we continue to evaluate relevant memory technologies to give our customers products with the most reliable, best performing memory at the lowest possible cost. 18

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Importance of using HP-certified memory modules in ProLiant
servers
There are several reasons why you should use only HP memory option kits to replace or add memory in
ProLiant servers.
First, not all DIMMs are created equal. They can vary greatly in quality and reliability. In the highly
competitive memory market, some third-party memory resellers forego the level of qualification and testing
needed for servers because it adds to the price of DIMMs. We use proprietary diagnostic tools and
specialized server memory diagnostic tests that exceed industry standards to ensure the highest level of
performance and availability for HP ProLiant servers. The cost related to system downtime, data loss, and
reduced productivity caused by lower quality memory is far greater than the price difference between HP-
certified memory and third party DIMMs.
Second, HP offers three levels of AMP that go beyond error correction to increase fault tolerance. These
AMP technologies—Online Spare Memory, Mirrored Memory, and Lockstep Memory—are optimized for
each server series. For ProLiant servers with AMP, the AMP mode you select determines the DIMM
configuration. HP memory option kits ensure correct configuration for each AMP mode.
Third, using HP memory option kits prevents improper mixing of single-, dual-, and quad-rank DIMMs.
Although DIMMs of different ranks may have the same capacity, they differ in the way the memory
controller accesses them. To ensure that the server boots properly and operates reliably, each channel’s
DIMM load should be consistent. HP memory option kits precisely match the capabilities and requirements
of the designated ProLiant server.
To find the correct HP memory option kit, consult the server’s user guide or the product QuickSpecs
available at
www.hp.com
.
Conclusion
The constant need to boost memory performance for increasingly powerful system processors drives the
development of advanced memory technologies. At HP, we continue to evaluate relevant memory
technologies to give our customers products with the most reliable, best performing memory at the lowest
possible cost.