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OpenCL same kernel, R7-260x and Rx480 produce different result

Question asked by song.h on Jan 26, 2017
Latest reply on Jan 31, 2017 by dipak

For same application, I used R7-260x (driver: fglrx, os: ubuntu 14.04) and Rx480(driver: amdgpu-pro, os: ubuntu16.04), they produced different result.

The application is:

Romein-gridding/Gridding-0.2 at master · awson/Romein-gridding · GitHub

 

If I modified the kernel (see the attachment), they can produce the same result, but for the runtime , the Rx480's performance is much worse than R7.

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