pory sim(OpenCL) use single or double precision?

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If it use double precision, the GTX580 more faster than GTX780?
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aty84122
If it use double precision, the GTX580 more faster than GTX780?

It uses single precision, except in a few rare (optional) cases that involve calculating the residual error in the solve. So I would not make any evaluation based on double precision performance, at least for Houdini.
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thank you
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