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Thread: Difference between rated peak performance and actual performance

  1. #1
    Junior Member
    Join Date
    Mar 2013

    Question Difference between rated peak performance and actual performance


    I am using laptop with RADEON HD-6290. Rated peak performance of gpu is 44 gflops (checked on wikipedia). When i am running OpenCL sample examples (provided by AMD) on gpu, it is giving performance of 5-6 G instructions. Why such a large difference between peak vs actual capacity.

    Please find attached file for more detail.

    2nd last column is instructions/sec (calculated as Total work item * ALU instructions * 1000 / time (ms)).
    Last column is instructions/sec normalized to 100% ALU busy.

    Attached Files Attached Files

  2. #2
    Senior Member
    Join Date
    Oct 2012
    first of all you shuld not believe a wikipedia post.
    But it should be correct that the theoretical peak performance is much higher, because it is calculated from the spec of the board without a single float calculated normally. also keep in mind that the GPU timers are not that acurate and on windows there is a large overhead because of the wddi

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