Further complicating matters: The number scheme
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made references to these ports something of a swamp.
Until last year, many USB-C ports carried the USB 3.1
label (“USB 3.2” was not yet a thing) in Gen 1 and Gen 2
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older name, along with SuperSpeed branding. In a
confusing twist, the USB-IF decided to eliminate the use
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as outlined below in this handy decoder chart.
The USB 3.2, USB 3.1, and SuperSpeed designations
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about the maximum transfer speeds of the port directly
with the device manufacturer or reseller.
As you can see, the newest and fastest USB-C ports use
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speeds of 20GBps. The USB-IF decided on “2x2”
because the new standard doubles the data lanes within
a USB-C cable to achieve the 20Gbps transfer speed.
These latest ports are not yet widely available, though
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end desktop motherboards.