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Thread: AMD R9 380 is faster then Nvidia 1080 on my PC

  1. #1
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    Aug 2017
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    AMD R9 380 is faster then Nvidia 1080 on my PC

    Hi

    I just replaced my old AMD R9 380 with an 1080 from Nvidia. Result seems to be good in games I got double performance or maybe even more.

    But then it comes to my software I have been written using opencl there is a large performance drop.

    It seems to be the method clEnqueueNDRangeKernel() now is 200-300% slower for some unknown reason. I have installed the latest drivers from Nvidia and removed all AMD drivers but still same strange result.

    The code is 100% the same between my tests.

    The AMD R9 380 is 3.5 TFLOPS and Nvidia 1080 is 9 TFLOPS.

    What Im a missing here?

    Help pls

    //Fredrik

  2. #2
    I have the R9 390. It works very fast due memory bus is 512 bit wide that is double than the nvidia. If your code has a high data transactions rate between gpu-cpu that is the problem.

    I increased the 390 speed 4x by using the 4 cores in parallel using multithreads

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