Comparison Table of Charging Speed and Transfer Speed for USB 2, USB 3, and USB 4! How to Choose a Charger? How to Choose a Charging Cable? Let You Know How to Buy the Charger and Charging Cable You Need

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Comparison Table of Charging Speed and Transfer Speed for USB 2, USB 3, and USB 4

USB Version	Transfer Speed (bit)	Maximum Power	Maximum Voltage	Maximum Current	Supported Devices
USB 2.0	480 Mbps	2.5 W	5 V	500 mA	`iPhone 15`
USB 3.1 GEN 1	5 Gbps	4.5 W	5 V	900 mA	-
USB 3.1 GEN 2	10 Gbps	4.5 W	5 V	900 mA	`iPhone 15 Pro`
USB 3.2 GEN 1x1	5 Gbps	4.5 W	5 V	900 mA	-
USB 3.2 GEN 2x1	10 Gbps	4.5 W	5 V	900 mA	-
USB 3.2 Gen 2x2	20 Gbps	7.5 W	5 V	1500 mA	-
USB 4	40 Gbps	100 W	20 V	5000 A	`Macbook`

How to Choose a Charger?

Look at the maximum supported wattage of your commonly used devices, higher wattage can support lower wattage devices

1. Check Your Device’s `Maximum Supported Wattage`

If your device’s maximum supported wattage is not supported, buying a higher wattage charger is useless and just a waste of money.

2. Portability and Price

Consider whether you need to carry the charger out often; usually, the higher the wattage, the heavier the charger, and the more expensive it is.

How to Choose a Charging Cable?

1. Supported Wattage

The higher the wattage, the faster the charging speed, and the higher the price.

Then check the maximum supported wattage of the devices you often need to charge, such as iPhone, Macbook, and iPad. Otherwise, buying a higher wattage charger is useless if your device does not support it, just a waste of money.

Supported Wattage of Charging Cables

2. Transfer Speed

The faster the transfer speed, the higher the price. If you need to transfer large files to a computer, you need a faster transfer speed.

iPhone 15 Pro supports USB 3's 10 Gbps transfer speed, so the cable also needs to support this transfer speed to be fast.

iPhone 15 only supports USB 3's 480 Mbps transfer speed, so if the cable’s transfer speed is higher, it is useless if your device does not support it.

3. Cable Length

In addition to considering how cable length affects storage and the distance to the charging device, longer cables may experience signal degradation, leading to reduced transfer efficiency. Therefore, longer cables are not always better; you should choose a cable length that suits your needs.

Supported Wattage and Transfer Speed of Charging Cables