Grace GB10, Vera's predecessor, had a single core performance comparable to M3 so I guess we can expect at least M4 level performance now.

Isn't the GB10 a Mediatek chip and not directly related to the Grace datacenter CPU?

The DGX Spark (and the white box variants of it) run on the Grace Blackwell GB10 "superchip".

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More fair to say it's completely unrelated to the Grace data center CPU.