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Q & A

The internet problems caused by USB2.0and USB3.0

Why my internet get not stable when I plug the USB flash or external USB DVD to the USB 2.0 Port on the mini pc, but internet stable when plug the same usb products to the USB 3.0 port in the same mini pc, what happen?


This problem most due to USB power supply different, USB 2.0 port can supply max 500ma but usb 3.0 can supply up to 900ma, so if your usb products require more than 500ma and less than 900ma, it will not be stable on the USB 2.0 port but stable on the USB 3.0 port. And USB problem on the motherboard will hurt the Lan chip power supply, that's why the internet get not stable if you plug usb products to USB 2.0.


USB 2.0 vs USB 3.0

USB 3.0, the latest version of USB (Universal Serial Bus), provides better speed and more efficient power management than USB 2.0. USB 3.0 is backward compatible with USB 2.0 devices; however, data transfer speeds are limited to USB 2.0 levels when these devices inter-operate.

Comparison chart


USB 2.0

USB 3.0



April 2000

November 2008


High Speed or HS, 480 Mbps (Megabits per second)

10 times faster than USB 2.0. Super Speed or SS, 4.8 Gbps (Giga bits per second)

Signaling Method

Polling mechanism i.e can either send or receive data (Half duplex)

Asynchronous mechanism i.e. can send and receive data simultaneously (Full duplex)


For a similar product, the USB 2.0 version is generally less expensive than it’s USB 3.0 version.

For a similar product, the USB 3.0 version is generally more expensive than it’s USB 2.0 version.

Power Usage

Up to 500 mA

Up to 900 mA. Allows better power efficiency with less power for idle states. Can power more devices from one hub.

Number of wires within the cable



Standard-A Connectors

Grey in color

Blue in color

Standard-B Connectors

Smaller in size

Extra space for more wires

Max Cable length

5 meters

3 meters




Release Date: 07-30-2018 16:57:34 [Go back Menu]
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