Thunderbolt 2 is NOT twice the speed of Thunderbolt 1

Thunderbolt 2 is NOT twice the speed of Thunderbolt 1

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Thunderbolt (interface) - Wikipedia

Intel's Thunderbolt 5 Doubles Speeds to Give Gamers Better, Faster Displays - CNET

Are ThunderBolt 1 and ThunderBolt 2 cables the exact same thing? Will a first gen ThunderBolt cable give me 20 Gbps performance if used with two ThunderBolt 2 devices or do I

Whats The Difference Between USB C Vs Thunderbolt

What is difference between thunderbolt 1 and thunderbolt 2? - Quora