The theoretical speed of USB 3.1 interface is 10Gbps, but it also reserves some bandwidth to support other functions. Therefore, its actual effective bandwidth is about 7.2Gbps, and the theoretical transmission speed should be 900MB/s. The actual transmission rate of the USb3.0 ultra-high speed interface is about 3.2Gbps (320MB/S). The theoretical maximum speed is 5.0Gbps (i.e. 500MB/S). It is nearly twice as fast.

1. The USB 3.1 interface will double the bandwidth to 10Gbps, and it is worth noting that the encoding rate will also increase again. USB 3.0 uses 8b10b encoding, that is, only 8bit is real data in every 10bit data transmission, and the remaining 2bit is used as the check code. Therefore, the entire bandwidth will be lost up to 20% (2/10). The new USB 3.1 uses 128b/132b encoding. In 132bit data, only 4bit is used as the check code, and the transmission loss rate will be significantly reduced to 3% (4/132). So USB 3.1 is not just to improve the bandwidth, Even the transmission efficiency has improved a lot.

2. In contrast, USB 3.0 provides 5V/0.9A power supply. However, people still hope for a stronger power supply capacity, so USB3.1 (SuperSpeed+) has raised the maximum allowable standard of power supply to 20V/5A and 100W.

3. It seems that USB 3.1 has many benefits, but we must pay attention to that USB 3.1 and USB Type-C are different things! Strictly speaking, USB 3.1 is a transmission standard, while USB Type-C is exactly an interface standard. There are three kinds of USB 3.1 interface standards, namely USB Type A, USB Type B (Micro USB) and the latest USB Type-C.