3.0と3.1 Gen 1とUSB 3.2 Gen 1x1が同じ5Gbps
USB 3.1 Gen 2とUSB 3.2 Gen 2x1が同じ10Gbps
USB 3.2 Gen 1x2が10Gbpsだけどレーン数が5Gbpsx2
USB 3.2 Gen 2x2が20Gbps
USB4 Gen3x1が20Gbps
USB4 Gen3x2が40Gbps
USB4はThunderbolt3と下位互換あり

ややこしいわ