USB-C Cable Guide: 60W vs 240W, USB 2.0 vs USB4

Two USB-C cables can look almost identical.

One might charge a laptop at high power, transfer large files at very high speed, and connect your computer to a monitor.

Another might charge your phone perfectly well—but transfer data at only USB 2.0 speed and fail completely when you try to use it with a USB-C monitor.

That is because USB-C describes the connector, not everything the cable can do.

Understanding those three things can save you from paying too much for capabilities you do not need—or buying a cable that looks right but cannot do the job.

The Short Version

1. Why Do USB-C Cables Have Different Capabilities?

USB-C is primarily a physical connector standard.

The familiar rounded, reversible plug tells you what fits into the port. It does not, by itself, tell you how much data, power, or video capability is available.

USB Type-C can be used with several generations of USB technology, including USB 2.0, USB 3.2, and USB4.

A 480Mbps cable and a much faster USB4 cable can both have the same USB-C connector on each end.

This is why shopping based only on phrases like “USB-C cable” is not enough.

2. 60W vs 240W: What Does the Wattage Mean?

The wattage rating tells you how much electrical power the cable is designed to carry under the applicable USB Power Delivery system.

60W

This class covers standard USB-C power delivery up to 3 amps.

For many devices, 60W is already plenty.

Typical examples include:

• phones
• tablets
• headphones
• cameras
• portable devices
• many ultraportable laptops

240W

The 240W class is designed for USB Power Delivery’s higher-power capabilities and can support devices requiring substantially more power.

USB Power Delivery was previously limited to 100W using 20 volts at 5 amps. USB PD 3.1 expanded the system with higher voltage levels, allowing power levels up to 240W.

This higher-power system is often referred to as Extended Power Range, or EPR.

3. Then Why Are So Many Cables Still Advertised as “100W”?

You will still see large numbers of cables sold as:

That terminology comes from the earlier USB Power Delivery limit.

Before USB PD was expanded beyond 100W, the high-power configuration topped out at 20 volts and 5 amps:

20V × 5A = 100W

That does not mean those cables suddenly became useless.

A properly designed 100W cable may still be perfectly suitable when the device needs 65W, 90W, or 100W.

If you are buying a new cable specifically for modern charging above 60W—or you want better future compatibility—look for an explicit 240W rating from a reputable manufacturer.

4. A 240W Cable Can Still Be Slow

This is probably the most important buying lesson in this article:

Power capability and data speed are separate specifications.

A cable capable of carrying 240W does not automatically transfer data at 40Gbps or 80Gbps.

It may be designed primarily for charging.

You may encounter combinations such as:

• USB 2.0 / 240W
• USB 5Gbps / 60W
• USB 10Gbps / 240W
• USB 20Gbps / 240W
• USB 40Gbps / 240W
• USB 80Gbps / 240W

The wattage does not tell you the data rate.

5. USB 2.0 vs 5Gbps, 10Gbps, 20Gbps, 40Gbps and 80Gbps

For shoppers, the easiest approach is to ignore much of USB’s complicated historical naming and look for the actual data rate.

What does this mean in real life?

For charging your phone:
USB 2.0 data may be completely adequate.

For occasionally moving photographs:
5Gbps or 10Gbps may be more useful.

For a fast external SSD:
10Gbps, 20Gbps, or faster may matter, depending on the SSD and computer.

For high-performance docks, very fast storage, and advanced USB4 equipment:
40Gbps or 80Gbps may be appropriate.

Buying the fastest cable available for every situation is unnecessary.

Buy for what you actually plan to connect.

6. Can a USB 2.0 USB-C Cable Still Fast-Charge?

Yes.

This surprises many people.

USB data speed and USB Power Delivery are not the same thing.

A USB 2.0 Type-C cable can still be useful for USB Power Delivery charging even though it does not contain the high-speed signal paths needed for faster USB data operation.

That means a cable can be excellent for charging while being relatively slow for data.

This makes sense for products such as:

• phone charging cables
• travel charging cables
• power-bank cables
• bedside charging cables

If you rarely transfer data through the cable, paying extra for 40Gbps performance may provide no practical benefit.

7. What Is an E-Marker?

An E-Marker, or electronic marker, is a small chip built into certain USB-C cables.

It allows connected USB Power Delivery equipment to identify information about the cable’s capabilities.

Electronic cable identification becomes especially important when higher current or certain advanced cable capabilities are involved.

Why does this matter?

Suppose a charger can provide high power and your laptop can accept high power.

The system still needs to know whether the cable between them is suitable.

The E-Marker helps communicate cable capability as part of USB Power Delivery operation.

A cable can contain an E-Marker because it supports higher current while still offering relatively modest data performance.

So do not shop using only the phrase “E-Marked USB-C cable.”

You should still check:

• wattage
• data speed
• video capability
• certification or manufacturer specifications

8. What About Video Through USB-C?

USB-C can also carry display signals—but once again, the shape of the connector does not guarantee that video will work.

One widely used method is DisplayPort Alt Mode, which allows DisplayPort video to travel through a USB-C connection.

The complete connection must support what you are trying to do.

That may include:

• the USB-C port on your laptop, tablet, or phone
• the cable
• the dock, adapter, or monitor
• the required DisplayPort or USB4 capability

A charging-only cable cannot magically add video capability.

So if you plan to connect your laptop to a USB-C monitor, do not buy based on wattage alone.

9. Why Your USB-C Monitor May Work With One Cable but Not Another

Imagine you have two cables.

Both may charge your laptop.

But Cable A may not support the signal paths needed for your USB-C monitor or high-performance dock.

Cable B may be appropriate for those advanced uses—assuming the connected devices also support the required display technology.

“The cable charges my laptop, but the monitor says no signal.”

Nothing is necessarily wrong with the charger, laptop, or monitor.

The cable may simply lack the required capability.

10. What Cable Should You Buy?

For a phone

If your main goal is charging, 60W is usually more than enough.

USB 2.0 data may also be sufficient if you rarely transfer files using the cable.

Do not pay extra for USB 40Gbps just because the number sounds better.

For a tablet

A good 60W cable will cover many tablets.

If the tablet doubles as a workstation and you regularly connect it to monitors or storage, check its required data and display capabilities as well.

For a laptop that charges at 45W or 60W

A quality 60W cable can be perfectly appropriate.

Buying 240W does not make a 60W laptop charge at 240W.

The device only takes the power it supports.

For a laptop requiring 65W, 90W, 100W, 140W or more

Choose a 240W-rated cable when buying new.

This gives you the appropriate modern power class above 60W and provides better flexibility for higher-powered equipment.

Remember that the charger itself must also support the required USB Power Delivery output.

For an external SSD

Look at data speed first.

If your SSD supports 10Gbps, using a USB 2.0 cable can create a severe bottleneck.

Match the cable’s data capability to the SSD and computer.

For a USB-C monitor

Confirm:

• the computer supports display output through that USB-C port
• the monitor supports the appropriate USB-C display connection
• the cable supports the necessary high-speed/video functionality
• the cable supports enough charging power if the monitor also powers the laptop

Do not assume any USB-C charging cable will work.

For a USB-C dock

This is where buying a better cable often makes sense.

A dock may simultaneously carry:

• charging power
• external displays
• Ethernet
• USB peripherals
• storage
• audio

Use the cable specified by the dock manufacturer or buy one whose power and data capabilities clearly meet the dock’s requirements.

For one versatile cable to keep in your bag

If you want one cable that can handle many situations rather than the cheapest charging cable, a useful target is:

USB 40Gbps is a particularly versatile class for many current high-performance devices, although whether you actually need 40Gbps depends on your equipment.

The key is not buying the biggest number.

It is buying a cable whose capabilities are clearly stated.

11. How to Read a USB-C Cable Listing

Power

Look for:

60W or 240W

If the listing says 100W, understand that this reflects the earlier 20V/5A USB PD power level. It may still be perfectly useful, but do not assume that automatically makes it a 240W EPR cable.

Data speed

Look for an actual number such as:

• 480Mbps
• 5Gbps
• 10Gbps
• 20Gbps
• 40Gbps
• 80Gbps

Be cautious when a listing simply says “High Speed” without telling you what that means.

Video

If you need a monitor or dock, look for explicit support for the required display capability.

Do not infer video support just because the cable supports high wattage.

Certification

USB-IF maintains a certification program, and compliant products may carry appropriate Certified USB logos.

Certification is not the only possible indication of a good cable, but a legitimate certification claim is more meaningful than vague marketing language.

12. Don’t Buy by Wattage Alone

Consider this listing:

That tells you something useful.

It tells you the claimed power capability.

But it does not answer:

• Is it USB 2.0?
• Is it 10Gbps?
• Is it 40Gbps?
• Can it work with my monitor?
• Can it run my dock properly?
• Is it actually certified?
• What does the manufacturer guarantee?

Likewise, “USB 40Gbps cable” tells you about data performance, but you should still check its power capability if you intend to charge a laptop through it.

Think of USB-C cables as having a capability profile, not one overall speed rating.

13. The Best USB-C Cable Is Not Necessarily the Most Expensive One

For a phone charging beside your bed, a well-made 60W charging cable may be all you need.

For a laptop connected to a monitor and fast external SSD, a much more capable cable may be justified.

Buying a premium USB4 cable for every charger in the house can be unnecessary.

On the other hand, buying an inexpensive charging-only cable and expecting it to operate a high-resolution monitor or fast SSD can lead to frustration.

The goal is matching the cable to the job.

EverReach Buying Checklist

Final Takeaway

USB-C made connectors simpler, but it did not make every cable identical.

The easiest way to avoid buying the wrong one is to separate three questions:

A 240W cable is not automatically a fast data cable.

A USB 40Gbps cable does not automatically mean your device will charge at 240W.

And a cable that charges your laptop perfectly may still be unsuitable for a monitor.

Check what your devices actually support, then choose a cable with clearly stated capabilities that match those requirements.

That is much more useful than simply buying the cable with the biggest number printed on the package.

Related EverReach Guides

How Many Watts Do You Really Need? A Practical USB-C Charger Guide
Learn why a bigger charger does not automatically mean faster charging, and how your device, charger, cable, and port allocation work together.

USB-C Is Only the Connector: How to Check Video, Charging and Data Before You Buy
Understand why two USB-C ports—or two USB-C cables—can look identical while supporting very different features.