![]() (What's in a "+" sign? Double the data speed, that's what.) USB 3.1 Rev1 (5 Gbps) is called "SuperSpeed USB," and USB 3.1 Rev2 (10 Gbps) is called "SuperSpeed USB 10 Gbps." Note that on the actual logos, these appear as "SuperSpeed" and "SuperSpeed+," respectively. Partially, this is because the USB-IF uses specific branding to clarify which USB 3.1 is which. You may have never even seen an OEM specify "Gen1" or "Gen2" in marketing materials mentioning USB 3.1. In order to clarify which is which and what is what, the USB-IF has turned to branding. The answer to the question that just popped into your head is no, there's no reason to market anything as "USB 3.0" at this point. "By incorporating USB 3.0, we're reducing the number of documents a developer needs to reference (we're talking hundreds and hundreds of pages of technical documents that developers have to parse through) and including all relevant information to ensure products are properly developed to be backwards compatible (protocol-wise, not related to cables/connectors)." "The USB 3.1 specification absorbed USB 3.0, meaning the terms USB 3.0 and USB 3.1 Gen 1 are synonymous," a USB-IF representative told Tom's Hardware. ![]() According to the USB-IF's documents, these changes include "added performance boosts to meet requirements for USB storage, display and docking applications," as well as USB 3.0 Engineering Change Notices (ECNs). ![]() Simply put, USB 3.1 Gen1 is USB 3.0 plus all of the changes that have been made to USB 3.0 over the years. USB 3.0 and USB 3.1 Gen1 are actually the same thing - almost. Both USB 3.0 and USB 3.1 Gen1 can transfer data at speeds up to 5.0 Gbps (8b/10b encoding), whereas USB 3.1 Gen2 can transfer data at speeds up to 10 Gbps (128b/132b encoding). There are two types of USB 3.1: There's a Gen1 and a Gen2, and they offer different data transfer speeds. ![]()
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