Memory performance on HP Z840/Z640/Z440 Workstation

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4AA5-6052ENW, January 2015
Conclusion
For the best memory performance, it is necessary to populate all memory channels on the processors. However,
there are applications and workloads where the performance impact from populating fewer memory channels will be
less apparent.
As a general rule, single or lightly threaded applications that do not require or use signicant memory bandwidth will
experience a smaller performance impact moving to larger memory DIMMs, in conjunction with populating fewer
memory channels. Threaded applications that do require or use signicant memory bandwidth will see a more signicant
impact moving to larger memory DIMMs, in conjunction with populating fewer memory channels.
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Technical white paper | Memory performance on HP Z840/Z640/Z440 Workstations