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How much faster can I expect the model to run? Well it depends on your grid size, the number of directional bins in your wave setup and your GPU. I have done some test with different grid size and different GPU, see Here.
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Can I trust the model outputs? Yes the model output is virtually similar than the original XBeach. For some proof and details about how similar XBeach and XBeach_GPU are visit this page.
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I don't have a Nvidia GPU on my computer can I still run the model? Yes, the code has been adapted to run on the CPU to help verify the GPU outputs but this is very slow.
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I have a GPU but not a Nvidia GPU can I still run the model on that GPU? No, sorry.
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I have a XBeach model setup. What do I do to run it on XBeach_GPU? Well assuming that you have a working executable of XBeach_GPU you need to make a new operational file for XBeach_GPU, reformat your bathymetry in the proper format. We are working to remove these step so you can directly feed in your grid and param file to XBeach_GPU