2 Replies Latest reply on Mar 27, 2014 3:50 PM by liwoog

    4x r9-280x/sky700 6GB cards memory allocation issue

    liwoog

      Hi,

       

      When we run more than 2x 6GB cards (either 4x R9-280x or 4x Sky700) in a 4 card machine, the AMD driver will not allocate more than 3GB (with 4 cards, for 3 cards, see below) per card even with the GPU_MAX_ALLOC_PERCENT and GPU_FORCE_64BIT_PTR set.

       

      No problem with 2 cards.

       

      Any pointers?

       

      Thanks,

       

      Lionel

       

      PS: Here is the relevant clinfo when 3 Sky 700 cards are installed, I have highlighted the abnormal memory availability:

        Max memory allocation: 631242752

        Global memory size: 1173356544

        Unified memory for Host and Device: 0

        Max memory allocation: 6144655360

        Global memory size: 6315573248

        Unified memory for Host and Device: 0

        Max memory allocation: 6144655360

        Global memory size: 6315573248