Thunderbolt 4: Same speeds as Thunderbolt 3, but more functionality available: Digital Photography Review

Though Thunderbolt 4 remains at 40Gb/s, its minimum requirements include dual 4K monitor support, faster external drive speeds and more.

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Thunderbolt 4 vs Thunderbolt 3 vs USB4

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The next generation of Thunderbolt seems nice but less necessary than ever - The Verge

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