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@malwareminigun @karotte @whitequark It's not enough, I think. Both USB 3.2 gen2x1 and 3.2 gen1x2 are 10Gbps, but they are not the same thing. Plug USB 3.2 gen2x1 into gen1x2, you will got the most common speed gen1x1 which is 5Gbps, vice versa. The same thing is also happened on USB4 v1 and USB 3.2 gen2x2, both are 20Gbps (ignore optional USB4 v1 40Gbps). But USB4 use a different PHY layer, so it need a tunnel to be compatible with USB 3. Unfortunately, only 10Gbps tunnel is required, 20Gbps tunnel is optional, so if you plug a USB 3.2 gen2x2 into USB 4, you may can only get 10Gbps instead of 20Gbps.