[Beowulf] General thoughts on Xeon 56xx versus E5 series?

Mark Hahn hahn at mcmaster.ca
Sun Sep 16 08:41:20 PDT 2012


> The memory controller is on die, so the bandwidth that the CPU itself
> delivers,
> independant from the number of channels, is dependant upon the CPU
> frequency.

this was true a number of years ago.  now both intel and amd chips
have multiple clock domains on chip.  after all, a core going "turbo" 
doesn't somehow overclock the memory interface.

> Higher frequency means more bandwidth simply with the given memory
> channels available.

higher frequency memory controller * channels * width = bandwidth, yes. 
that's just definitional and everyone already knows it.


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