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> I wonder how they manage to keep the FP64 units busy

They don’t. See https://www.amd.com/en/graphics/server-accelerators-benchmar....

The MI250X, despite being dual big dies, doesn’t do especially well.

I disagree. The website you linked to shows speed-ups on MI250X between 1.6x and 3x higher than A100. The theoretical memory bandwidth speed-up between MI250X and A100 is only 1.6X (3.2 TB/s vs 2.0 TB/s). Thus, I'd say they are seeing the advantage of higher FP64 compute in those applications.

Makes sense. Comparing nodes with 2x or 4x MI250X vs 4x or 8x A100-80 it doesn't really seem that there is any speed up at all for memory bound apps.

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