Usability of USB 3.1 Gen1/2 compared to USB 3.2 Gen1/2
Usability of USB 3.1 Gen1/2 compared to USB 3.2 Gen1/2
In brief, it can be observed that:
USB 3.1 Gen1 and 3.2 Gen1 both handle 5Gbps, with no significant distinction aside from their naming?
And
USB 3.1 Gen2 and 3.2 Gen2 both support 10Gbps, showing no major differences...
Similar to Thunderbolt 3 and 4, which also reach up to 40Gbps, but Thunderbolt 3 has limitations in PCIE speed/bandwidth—are there any distinctions between:
USB 3.1 Gen1 and 3.2 Gen1
and
USB 3.1 Gen2 and 3.2 Gen2?
Or are they essentially the same as long as they belong to the same USB generation?
This situation stems from frequent updates to the LABELS on USB3 devices, driven by genuine technical advancements. Consequently, many products now display outdated promotional text using labels that are no longer valid.
Currently, all USB3 devices are integrated into the USB 3.2 framework (with a separate USB4 variant).
When it comes to CABLES, remember that older USB2 Type A connectors differ from the newer USB 3.2 Type A connectors. USB 3.2 cables and sockets feature more wires, and their connectors include five additional contact points. These days, a color coding system has been introduced. USB2 connectors use plastic inserts to accommodate black contacts, whereas USB 3.2 Type A connectors utilize blue inserts.
USB 3.2 Gen1 supports data transfer up to 5 Gb/s and functions well with either USB 3.2 Type A or newer Type C connectors. A motherboard header can house two such ports, enabling dual output connections.
USB 3.2 Gen 2 reaches speeds of up to 10 Gb/s, but it’s advisable to use only Type C connectors for optimal performance. It supports the same header as Gen1 and has two ports, though the speed remains limited compared to Gen1.
USB 3.2 Gen2x2 can achieve data rates of up to 20 Gb/s. The header on the motherboard is identical to Gen1, but it features only one port. This configuration is unlikely to reach its full potential unless the Type C connector is employed.
All these versions maintain backward compatibility. When a device connects, it communicates with the port controller chip to agree on the maximum data rate for that specific port, even adjusting for older USB2 systems at 0.48 Gb/s.
The overall design principle emphasizes that the USB 3.2 communication subsystem defines the maximum data transfer speed, ensuring it surpasses the device’s actual capabilities so as not to restrict performance. The device itself—such as a spinning hard drive or SSD—may impose its own slower limits.
USB 3.2 specifications also modify the power supply available on standard ports. USB2 provided 5 VDC at up to 0.5 A per port, while USB 3.2 increases this to 0.9 A per port. Additionally, certain USB 3.2 ports support higher maximum currents for charging devices, though these are not universally adopted. Some external USB 3.2 hubs include high-power charging ports but lack data transfer capabilities. These ports are intended solely for charging. However, the situation can become complex as some USB 3.2 ports also offer enhanced power delivery beyond the standard 0.9 A per port.