Figures, MacBook pro GPUs are rather short on memory bandwidth. Add in the memcpy overhead, and it can be a tie.
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CPU simd is way more useful because in cloud you can rent lowcost avx512 on n cores you want, otherwise only a full pricy GPU by Nvidia. OSes can virtualize and separate parts of CPUs but not parts of a GPU for many users.
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We're starting to see vGPU implementations though :)
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That difference is where a lot of moores law went for the last decade.
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