5 Replies Latest reply on Apr 15, 2011 4:59 AM by rollyng

    SDK 2.4 multiGPU in 2xHD5970

    afo
      SDK 2.4 seems to work for multiGPU.

      Hi,

      This is just to share some insights about using SDK 2.4 for multiGPU.

      System:

      msi 790FX-GD70, AMD Phenom II 945, 4 GB RAM, OpenSuse 11.2 x86_64, SDK 2.4, catalyst 11.3, 2xHD5970

      There is an improvement over SDK 2.3, now 3/4 instances of the same application using different GPUs don't have a drop in performance respect to 1/2 instances.

      When I tried 4 instances of the application running in parallel the machine hanged; but the problem was that a 1000W PSU was not enought for the system; using a 700W PSU for the second card solved the problem, so OpenCL multiGPU seems to work, at least for one thread, one context, one GPU, and each context having its own buffers, kernels, etc.

      best regards,

      Alfonso