Energy to confirm one block with state-of-the-art hardware at current difficulty level

Energy to confirm one block with state-of-the-art hardware at current difficulty level

An earlier answer claims it would burn around $2M worth of electricity to confirm one block using an ordinary CPU. See: Energy to confirm one block? Can anyone estimate what this figure would be for today's state-of-the-art mining hardware?

E.g., suppose I am presented with a chain of 8 block headers with mining difficulty at or above current level. Without any other information, how certain could I be that they were generated by current blockchain network? How much would it cost to create a fake, ignoring equipment cost?

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