Since its release in 2000, USB 2.0
has made its way in almost every device imaginable… computers, laptops,
tablets, phones, cameras, storage devices and even bitcoin miners. While
it has enjoyed tremendous popularity for over a decade, its successor
USB 3.0 has been gaining rapid adoption among newer devices.
On paper, USB 2.0 is capable of transfer speeds of up to 480
Mbps while USB 3.0 caps out at 5,000 Mbps. This would suggest that USB
3.0 is at least 10 times than USB 2.0, but we all know these figures are
meaningless unless it’s backed up by real world tests.
Real world speed tests done by many trusted brands have all led to
similar results: USB 3.0 is about 3 times (2.5 times to 3.5 times)
faster than USB 2.0. While this falls short of its marketing claim, 3
times faster is still a significant speed boost.
However, most articles fail to mention one very important point: Not
all devices will benefit from USB 3.0’s superior transfer rates. Yes,
external hard drives and flash drives will be able to take full
advantage of USB 3.0’s speed boost. USB 3.0 mobile phones and tablets
are also 2 to 3 times faster when transferring large files from their
internal memories.
But for other USB devices such as external optical drives, keyboards,
mice, webcams, printers, speakers, network adapters etc… there is
little performance difference between USB 2.0 and 3.0.
A USB 2.0 port is able to deliver 0.5 A of power while USB 3.0 is
able to output 0.9 A. This means two things: USB 3.0 devices are able to
charge faster and USB 3.0 ports can support more power-hungry devices.
Samsung’s Galaxy Note 3 is the first phone in the world with a USB
3.0 port, making it ideal for comparing USB 2.0 and USB 3.0 charging
speeds.
The Note 3 was connected to a desktop computer’s USB 2.0 port and
recorded the time it took for the phone battery to charge from 0 to
100%. The same process was then repeated with a USB 3.0 port and a wall
charger.
Charge Time
Take-home lesson: If you’re using a desktop or laptop computer to
charge your devices, then USB 3.0 will save you a good chunk of waiting
time. However, USB 3.0’s improved charge speed still pales in comparison
to a wall charger (Note 3’s default wall charger is rated at 2.0 A).
Color is the key to telling the difference between USB 2.0 and 3.0
ports. In almost all cases, USB 3.0 ports are blue while USB 2.0 ports
are black or white in color.
Standard USB cables follow the same color scheme as well. In the
image below, we can see that USB 2.0 connectors are white (or black),
while USB 3.0 connectors are blue in color. It is also common to find a
“SS” (SuperSpeed) label on USB 3.0 cables.
As for Micro USB cables (often used with mobile phones, tablets and
external hard drives), you can tell the difference between USB 2.0 and
3.0 from the shapes of their connectors – Micro USB 3.0 connectors are
wider than 2.0 ones. If you look closer at the image below, you will be
able to spot a “SS” label on the Micro USB 3.0 cable as well.
USB 3.0 is backwards compatible, so the short answer is yes. To make things clear and simple:
USB 2.0 port + USB 2.0 device = USB 2.0 performance
USB 2.0 port + USB 3.0 device = USB 2.0 performance
USB 3.0 port + USB 2.0 device = USB 2.0 performance
USB 3.0 port + USB 3.0 device = USB 3.0 performance
Any combination will work… but to
take advantage USB 3.0’s improved speed and charging, you’ll need 3
ingredients: USB 3.0 port, USB 3.0 device and USB 3.0 cable.