USB-C ports and 2x2
Do the new MacBook Pro’s USB-C ports, support USB-C 2x2 (20Gb)?
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No. It only supports 10GBps USB 3.2 Gen2 (including earlier USB specifications), 40GBps USB4 and 40GBps Thunderbolt 3/4, it does not support 20GBps USB 3.2 Gen2x2.
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Thunderbolt 4 is the USB 3.2 spec!
If incorporates Thunderbolt 3 performance features one is the dual lane link netting 20 gigabytes per second per link or bi-directionally 40 gigabytes per second.
You do need to make sure both devices and the cable connecting them is TB4 spec’ed to get the full performance.
References:
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