Thunderbolt 2 is NOT twice the speed of Thunderbolt 1

It turns out that the main difference between the two Thunderbolts is that version 2 has channel bonding and full DisplayPort 1.2, for full 4K video support. Whereas Thunderbolt 1 has 4 independent 10 Gb/s channels, Thunderbolt 2 combines these to give 2 20 Gb/s bidirectional channels. This leads to more efficient transfers, with less overhead, but the total bandwidth is unchanged.

It’s not practical to daisychain a 4K monitor and high-speed storage. Independent connections are required.

via RedShark News – Thunderbolt 2 is NOT twice the speed of Thunderbolt 1.

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