USB 3.1 Gen 1 vs Gen 2 – What’s The Difference?

by Lisa Hayden
USB 3.1 Gen 1 vs Gen 2

Want to know the difference between USB 3.1 Gen 1 vs Gen 2? Read on to find out...

Ever heard of the USB 3.1? What about the USB 3.1 Gen 1 and Gen 2? If this is the first time you’re hearing them, then you’re probably just as confused as the next guy. USBs used to be just one type and even if they had several iterations, not a lot of people knew the difference or at least cared about it. But why should you care now? And how is Gen 1 and Gen 2 different? Read on to know more about them. 

USBs and Their Different Iterations

USBs and Their Different Iterations

In simple terms, USB or universal serial bus is a plug and play mechanism that allows you to transfer files from one hardware to another. It refers to both the port and the cord that connects a broad range of devices for data sharing. Today, USBs are also capable of sending power to certain devices. Take your phone, for example. If you plug it to your laptop, then it will automatically charge. 

The first version of the USB was released way back in 1996. Even if it has been more than 20 years since its first commercial release, USBs remain relevant today. In fact, it’s the most popular sharing interface, even more popular than the floppy disk was back in the day. This is mainly because the big IT companies like Microsoft, IBM, and Intel easily adopted the use of USBs in their day-to-day operations. 

Since then, different USB connector types emerged that you can use for different devices. The standard USB is what you would normally use for connecting to your laptop or desktop. The mini-USB and the micro-USB, however, can be used for digital devices such as cameras, controllers, and even smartphones. Today, you’re seeing a relatively new type which is the USB type-C that you can use to charge and connect your Android smartphone. 

The USB 3.1

The main question here is really, what is USB 3.1? How is its Gen 1 and Gen 2 different? Here’s a quick background of how USB 3.1 started. 

After the first version of the USB, there were different iterations that emerged - the USB 2.0 and the USB 3.0. The former was released in 2000 and supported data exchange of 480Mbit/s. The latter was released in 2008 which supported a higher data exchange of 5 Gbit/s. 

For obvious reasons, the iterations of the USB did not stop there. In late 2013, the USB 3.1 was born and it boasts of a 10 Gbit/s transfer. You’re probably wondering why it was named “3.1” instead of “USB 4.0”. Unfortunately, nobody knows why it veered away from the natural progression of USB iterations save for the USB-IF (USB Implementers Forum). The theory is that the USB 3.1 Gen 1 was merged with the USB 3.0 which is why it took the same name and added generation numbers as identifiers. 

If you go to the store and buy a USB 3.0, you’ll notice that there’s no available product for that. Why? It’s because the USB-IF merged the USB 3.1 to the USB 3.0 to reduce the number of technical documents that a developer needs to go through to reference the USBs. This might sound a little confusing, but all you have to think about now is that there is no longer a USB 3.0 available in the market. If you do find one, that’s most likely been owned by someone before it was phased out. Anyway, USB 3.1 is definitely faster in terms of transfer speeds because it’s twice as fast as its predecessor. 

USB 3.1 Gen 1 vs USB 3.1 Gen 2

USB 3.1 Gen 1 vs USB 3.1 Gen 2

This brings us to the two generations of USB 3.1. How is Gen 1 different from Gen 2?

First of all, you should know that USB 3.1 Gen1 and USB 3.1 Gen 2 are also called SuperSpeed USB and SuperSpeed USB+, respectively. While those two names are just the brandings given to the two devices, they already give you an idea of the major difference between the two generations. 

The main difference between USB 3.1 Gen 1 and USB 3.1 Gen 2 is on their transfer speeds. In fact, that’s the most obvious difference they have. Other differences are just too technical for you to know and care about. Anyway, the USB 3.1 Gen 1 has a transfer speed of 5Gbps while the USB 3.1 Gen 2 has a transfer speed of 10Gbps. 

Another difference that can help you differentiate one another is that USB 3.1 Gen 1 can be used synonymously with USB 3.0 whereas USB 3.1 Gen 2 cannot. The former has the same power as the USB 3.0 too which is up to 900 mA at 5V. 

As for the appearance, the USB 3.1 Gen 1 is a lot bulkier than the USB 3.1 Gen 2. This is because the Gen 1 version has connectors for the printer and for the Micro-B connector. It’s like a 2-in-1 connector. On the other hand, Gen 2 is often associated with the USB Type C. 

usb type c

USB Type C? Isn’t that a newer version of a USB? That part is true. In fact, USB Type C is different from USB 3.1 Gen 2 because USB Type C is a connector type and not a USB standard. USB 3.1 Gen 2 is the standard that is found at the ends of the connector. Although the USB Type C can also have features of the USB 3.1 Gen 2, it does not dictate the transfer speed; the latter does that instead. 

Which one should you get? For obvious reasons, you would want to get Gen 2 because it’s a lot faster in terms of transferring the same number of files from one hardware to another. Sure, the Gen 1 still works, but you might as well get the faster one. 


Keeping track of all these USB names and iterations can be confusing. To help you understand them, it’s best to know which ones are ports, connector types, and standards. USB 3.1 Gen 1 and USB 3.1 Gen 2 are both standards that only differ in transfer speeds. Gen 1 has 5Gbps while Gen 2 10Gbps. 

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