In the left-hand navigation list, you can click Thunderbolt (or “Thunderbolt/USB4”) or USB to see items connected to the various internal buses. Now hold down the Option key and choose > System Information. With knowledge of the speed of a peripheral and your unknown cable, plug it into your Thunderbolt 3 or 4 capable Mac. Thunderbolt 3 and Thunderbolt 4: Up to 40 Gbps.If you have an SSD or RAID with USB 3.2 Gen 2×2 and the appropriate cable, Apple devices will still report they can handle only up to 10 Gbps. USB 3.2 Gen 2×2 (SS20 or SuperSpeed 20 Gbps): While some cables support this faster USB 3.2 standard, Apple doesn’t. USB 3.2 Gen 2 (SS10 or SuperSpeed 10 Gbps): With both ends sporting USB-C, 10 Gbps is the top potential speed if one tip is a USB Type-A connector, it might transfer at rates up to 10 Gbps.(Formerly known as USB 3.0 and 3.1 Gen 1.) USB 3.2 Gen 1 (SS5 or SuperSpeed 5 Gbps): With a USB-C to USB Type-A cable or adapter, you may only be able to pass up to 5 Gbps.
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