[Beowulf] Opteron downrates DDR400 to DDR333 performance?
V. B. Hunt
shoalcreek5 at gmail.com
Fri Feb 3 08:32:45 PST 2006
NazarioJose at JohnDeere.com wrote:
> Hello, computer gurus -
> do any of you know if the AMD Opteron downrates the PC3200 400 MHz DIMMS
> (DDR400) to 333 MHz (DDR333) performance when the system has more that 2
> Gbytes of memory installed?
> i was told that when an opteron socke has more that 2GBytes of memory, then
> the cpu will automatically downrate the memory rate to an equivalence of
> DDR333 memory.
> Thank you for your time.
> Beowulf mailing list, Beowulf at beowulf.org
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No, that is not true. The test results at
that the Opteron interaction with memory is better in most cases when
the memory is above 2 GB/processor die. If your motherboard supports a
dual-channel or quad-channel memory configuration, you can take more
advantage of the Opteron's capabilities and high-bandwidth memory by
installing more than 2GB of memory. Just make sure all of the modules
support the higher bandwidth or the on-die memory controller will
automatically run at the frequency of your slowest module.
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