1 Reply Latest reply on Aug 3, 2010 12:41 PM by nou

    Enabling CAL for 2 X HD5970 without crossfire / linux 32bit


      Hi! I am trying to run a computation-intensive app on 4 GPUs on two HD5970 cards - using CAL.

      In default configuration, CAL reports only one device, and indeed allows only one device to be set up.

      When crossfire is enabled, I can run two devices, but performance is degraded (instead of getting double the speed, I get about half the speed).

      As the threads are independent, I don't need crossfire - I just need to run on all four GPUs - as many threads as possible concurrently.

      I was not able to configure the system so tha CAL reports 4 devices, and no crossfire.

      System details:

      O/S: Ubuntu 10.4, kernel 2.6.32-21-generic

      Mobo: Asus 6PT