Power
Use the documented power rating.
USB-IF’s current certified USB-C to USB-C cable marking scheme uses power logos such as 60W and 240W. Five-amp operation above 60W requires an electronically marked cable. Older 100W-rated cables remain common in the market, so the practical rule is to verify the manufacturer’s explicit watt/current rating rather than rely on appearance.
Data
Charging wattage does not tell you data speed.
A cable marketed for high charging power can carry only USB 2.0 data. Conversely, a high-speed cable can have a lower charging rating. Check the stated data rate and USB generation/certification separately from power.
USB 2.0 data can be enough for charging, keyboards, and simple peripherals.
Choose the data rate required by the device and host. The slowest link in the chain sets the ceiling.
Use a cable explicitly certified/documented for the required USB4 or Thunderbolt mode and supported length.
Video
The cable and the host both need the right path.
Native DisplayPort Alt Mode uses USB-C high-speed lanes, so a charging/USB-2-only cable is not a substitute for a cable documented for video-capable high-speed operation. But replacing the cable cannot add DisplayPort Alt Mode to a host port that does not support it.
Length
Do not assume every feature survives at every passive-cable length.
High data rates become harder to maintain as passive cable length increases. For USB4, Thunderbolt, high-resolution displays, or high-power charging, use a cable whose manufacturer explicitly supports the intended mode at the length you are buying. Active cables can extend some high-speed modes but may have different compatibility rules.
Buying checklist
- Required charging wattage/current
- Required USB data rate
- DisplayPort/video requirement
- USB4 or Thunderbolt requirement
- Connector orientation: USB-C to C, C to A, etc.
- Required length at the desired data/video mode
- Reputable manufacturer and clear published specification/certification
Related
Sources