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I was under the impression that their uptake it slow or non-existant. Am I wrong on that?

Is it really faster than cublas?

In some things yes. They're mostly identical in performance though

CUTLASS would like to have a word with you.

evidence?

Modular/Mojo is faster than NVIDIA's libraries on their own chips, and open source instead of binary blob. See the 4 part series that culimates in https://www.modular.com/blog/matrix-multiplication-on-blackw... for Blackwell for example.

thanks