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Author Topic: OpenCL on ATI HD 4870X2  (Read 60376 times)

chestertech

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Re: OpenCL on ATI HD 4870X2
« Reply #15 on: May 20, 2011, 08:18:36 »
Where did u get 1141? Is there closed beta testing?
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hsei

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Re: OpenCL on ATI HD 4870X2
« Reply #16 on: May 22, 2011, 00:47:16 »
Just follow the download link in "news - beta version 1.6.0". It has the latest build sometimes mentioned with an addendum in that thread, but often not.
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chestertech

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Re: OpenCL on ATI HD 4870X2
« Reply #17 on: May 23, 2011, 18:23:05 »
1141, same as above, but with string - "no images support"
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Admin

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Re: OpenCL on ATI HD 4870X2
« Reply #18 on: May 24, 2011, 01:15:25 »
Quote from: chestertech on May 01, 2011, 07:58:13
1141, same as above, but with string - "no images support"

Thanks, it's all we need.


Quote from: hsei on May 15, 2011, 20:34:53
Build 1141 no longer shows "calculation error" in benchmark. But calculation time and CPU load is roughly the same with and without OpenCL enabled.

Speedup seen only on big amount of files (>1000) and only on "precise" algorithm. It uses one of the working threads (Options -> Misc. -> Performance: "auto" = processor cores * 2) to work with OpenCL device and don't use CPU, all other threads do work as usually on CPU. In this method we have all power of CPU + OpenCL device.
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