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Last Updated On: December 3, 2016
Editor: Adeeb C

How USB 3.0 Technology is Better than USB 2.0

Category: Computer,Featured
USB 3 vs USB 2

USB 3 vs USB 2

We all know that every up gradation is better than its previous version. But knowing specific about it helps us to choose the best option as not all the upgrades are meant to be created for all people or all types of use. There may be many cases in which the primary version still can do better or may be the right option to choose the update. Today, we will see in which ways the USB 3.0 technology is better than the USB 2.0.

First, let’s see what is USB 3.0 and USB 2.0

The USB (Universal Serial Bus) was developed back in the 1990s to identify the communication protocols of cables and their connectors between computer systems and electronic devices like scanners, printers, etc. in 2002, USB 2.0 was released and after eight years, USB 3.0 released in 2010.

The USB 3.0 has an effective bandwidth rate than the USB 2.0 which offers a bulk transfer speed of over 400 MB/s (USB 3.0 provides over 5 GB/s transfer speed).

Today, devices like smartphones, tablets, portable monitors, PDAs, gaming consoles connect to your computer with a USB port for both charging and communication purposes. So in the other way, the USB technology eliminates the need for adapters and power chargers.

Now, let quickly check the abilities of USB 3.0 over USB 2.0

Superior Speed

The USB 3.0 has an effective bandwidth rate than the USB 2.0 which offers a bulk transfer speed of over 400 MB/s (USB 3.0 provides over 5 GB/s transfer speed). This results in cost-saving opportunities for integrators and also improves overall speed and efficiency of the system.

Data Path

Instead of the one-way communication of USB 2.0, the USB 3.0 provides two unidirectional paths (One for receiving and one for data transmission).

Additional Physical Bus

USB 3.0 has double amount of wires than USB 2.0 (8 instead of 4). As the extra wiring requires more space in cables and connectors, the new type of connectors was designed.


The USB 3.0 offers the power of up to 900mA compared to 500mA provided by the USB 2.0. So USB devices provide more power, but also conserves more power when the device is connected but is in idle condition.

Bus Utilization

The USB 3.0 technology has an added feature of NRDY and ERDY bus utilisation. When the transfer is made between the device and the computer via a USB 3.0 port, the host sends a request which is answered as a response (Accept/Reject) from the connected device. If the device accepts the request, then the data transfer is made and if the request is rejected by the device due to a lack buffer space or data, an NRDY (Not Ready) signal is sent to the host. A signal of ERDY (Endpoint Ready) is sent to the host when the device is ready and the transfer can be rescheduled then.

How to detect the USB 3.0 port?

Both the USB 3.0 and USB 2.0 connectors are different from each other. The USB 3.0 connectors are colored blue inside the port, so you can easily identify them in your computer system.


As with the features up gradation, the price also has upgraded for the USB 3.0. With better error management, almost ten times faster transfer speed, longer cable lengths, lower latency and jitter times, and many more functionalities make the USB 3.0 far better than the USB 2.0 technology.

Note: In 2014, the latest version of USB 3.1 was released. It has some major improvements than USB 3.0 which we will check in my next post.