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usb3.1究竟比usb3.0接口快多少
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usb 3.1的接口理论速率是10gbps，但是其还保留了部分带宽用以支持其他功能，因此其实际的有效带宽大约为7.2gbps，理论传输速度应该可以达到900mb/s。usb3.0超高速接口的实际传输速率大约是3.2gbps（即320mb/s)。理论上的最高速率是5.0gbps（即500mb/s）。实际接近快一倍。
1、usb 3.1介面将把频宽再翻倍，提升至10gbps，同时值得注意的是，编码率也再度提升。usb 3.0为8b10b编码，也就是每传送10bit资料中，只有8bit是真实的资料，剩余的2bit是做为检查码，因此整个频宽会有高达20%（2/10）的损耗，而新的usb 3.1则是使用128b/132b编码，在132bit的资料中，只需使用4bit做为检查码，传输损耗率大幅下降为3%（4/132），所以usb 3.1不单只是提升频宽而已，连传输效率也增进不少。
2、相比、usb 3.0提供了5v/0.9a电源。但人们任然希望更强的供电能力，于是usb3.1(superspeed )将供电的最高允许标准提高到了20v/5a，供电100w。
3、看起来usb 3.1好处多多，但是大家一定要注意usb 3.1与usb type-c是两码事！严格的说，usb 3.1是一项传输标准，而usb type-c，准确的说是一种接口标准。usb 3.1的接口标准共有三种，分别是usb type a，usb type b（micro usb）以及最新的usb type-c。
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