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Understanding CPU aggregation from one generation to the next



  • Rowan Pavlovic

    On this same subject I have had a mail from the a customer looking for guidance on the difference between CPU generations. We understand that DPACK aggregates the total GHz of processing power, but a cycle of an E5 v2 CPU for example would not be comparable to a cycle of Skylake SP CPU.


    Customer Mail : 

    I am keen to understand how we can normalise the peak CPU from DPACK (below) so we can accurately size new 14G servers using Skylake CPUs. 

    Peak CPU 468GHz      Net CPU 1193.08Ghz      Cores 472

    Now clearly 1 GHz on a Skylake CPU with typical workloads (i.e. Hyper-V/VMware running a general range of Windows/Linux servers) might be equivalent to:


    1. v4  0.8 GHz
    2. v3  0.7 GHz
    3. v2  0.6 GHz
    4. v1  0.5 GHz


    Now I know that the performance difference depends on the workload so the above would need to be fairly conservative, but I assume it is possible.

     Just having the above rule of thumb numbers that are endorsed by Dell EMC would be a big step forward.

     I assume this is going to be an even bigger problem when 'other vendor' CPUs are available at the end of the year, as a GHz of Skylake may be quite different to a GHz of another vendor CPU.

     The bottom line is does it make sense to size based on Peak CPU GHz with a weighting/normalisation based on the CPU architecture/generation and if so how do we do it?


    Does anyone have any opinions on this?

  • Sam Kirchoff


    From what I understand, our server division is building a guidance wizard that might be out as soon as a couple of weeks.

    However, this is really something that needs to be answered by Intel. I think it would be hard for a server OEM to make claims here since if they don't make the chip.

    I have seen some generational guidance documents, but they all market as non-postable.

    To be safe, you might look 15% over v4 or (~1.15%), 20% over v3, 30% over v2.

    Disclaimer: These are very unofficial fragments that I have been able to pry out of reluctant people :) 

  • Sam Currie


    Do you know if the 'guidance wizard' was released?



  • Sam Kirchoff

    Sorry. What is the guidance wizard? I don't think I am familiar with that. 

  • Sam Currie

    I was referring to your earlier post, July 28, you mentioned:

    "From what I understand, our server division is building a guidance wizard that might be out as soon as a couple of weeks"

    Do you know if it was released?


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