Does Size Of DisplayPort Cables Affect Its Performance?

Alex Clarkson
Alex Clarkson

Moving is not easy. And it requires a lot of renovations. One of them includes replacing the wires. Wires are always either too long or too short.

The length of the cables doesn’t matter. In the case of a DisplayPort cable, it does. And a lot of people are unaware of that.

So, the real question- does size of DisplayPort cable affect its performance?

The answer is- yes it does. That’s because if the cable length is long, the signals get interfered with EMI [Electromagnetic Interference]. Thus the signal weakens. And in the process of transmission, a lot of the data gets lost. That is why the resolution of the video and audio signals is not the greatest.

These are the reasons why a DisplayPort cable affects its performance. If you want to know an in-depth explanation, spare us a few minutes. And read along.

Let’s begin-

I’m Not Sure What A DisplayPort Cable Is

im not sure what a displayport cable is

Have you ever connected your PC monitor to your graphics card? If you have, you might’ve come across this cable. These cables also go with television, laptops, and projectors. The DP cable has almost been taken over by HDMI. But performance-wise- the DisplayPort cable is definitely winning.

Video Electronics Standards Association [VESA] manufactured DisplayPort Cable back in 2006. Their debut was intended to replace the old analog cables that used to connect a PC.

These cables also provided high-quality video and audio to any device. Soon after they were introduced in the tech world, VGA cables got replaced. Both for performance and effectiveness. However, VGA cables are still used by converting to DVD. There are special converters for that.

DisplayPorts are made of copper wires wrapped in a braid and dielectric materials. The copper wires transmit signals. Whereas the braid and the dielectric materials protect the signals from getting distorted. So the signals don’t get interfered with.

The function of a DisplayPort cable [or DP cable] is similar to that of a USB. It’s also similar to an Ethernet network connection cable. Their main work is to transmit signals to your device.

Just like a USB cable, DisplayPort cable transmits data from a source to the device. Which is mostly transmitted in packets/groups.

DisplayPort transmits both video and audio signals to television, computer monitor, and laptops. They’re also essential for classroom or office projectors. Because that’s where they require a high-quality video and multiple audio channel transmission.

Displayport transmits audio and video signals in the same channel. And they have fewer pins compared to HDMI, USB-A, and USB-C. Displayport has about 30 pins fitted in the L-shaped plug/connector. This is what makes a Displayport cable different from that of other cables.

However, DisplayPort and HDMIs are still compared due to their various merits and demerits. Though HDMI cables don’t have an issue with their length. The video and audio quality of the DP cables are better than HDMI cables. This is why a lot of people still prefer using DisplayPort cables instead of HDMI.

A lot of people use DP cables with dongles. That’s because all the devices are manufactured with an HDMI or USB port. So using s dongle helps them to connect HDMI or any kind of port with DP cable.

Display ports have extremely high bandwidth. Which is great for effective transmission of high-quality video and audio. However, if you’re thinking about refresh rates,  DP cable is a winner.

Because a DisplayPort supports almost every kind of mainstream resolution. And they support a resolution from a lower range of 30Hz to a higher range of 24oHz.

It mainly depends on the number of monitors your DP cable is supporting. Also the kind of device and monitor you are using. So this means you don’t have to worry about DisplayPort resolutions.

But there’s something you have to worry about, and that’s the length of the DisplayPort. This is what we are going to discuss-

Does Size Of DisplayPort Cables Affect Its Performance?

In case you’re still confused about this frequently asked question. Yes, the length of the DisplayPort cable matters. And it affects the performance of the display and audio.

Not that it is a major thing to worry about. Still, consider this before moving your computer or television to a different place.

Now, why will length matter?

It will matter because of the transmission of signals. When your device is connected to a high-quality external graphics card. You’ll get a better video and audio reception.

If your cable is long, the video and audio quality will not be the same. It will get distorted or you’ll get a diminished quality.

The reason is simple. When you have a long DP cable, the signal transmission strength weakens. And that’s why quality diminishes. As a result, the signal received will not give a good quality video or audio.

On the other hand, the chances of signals weakening in short cables are very thin. That’s why the device receiving the signal will have optimal performance.

Why does the signal weaken though?

Ever hear about EMI? No, it’s not equated monthly installments. Rather, it is electromagnetic interference. This is a kind of radio frequency. What it does is interferes with signals transmitting in the cable. As a result, the signal gets distorted and weakens.

This EMI frequency interferes with almost every electrical circuit in your room. It resists a smooth transmission process of data from one device to another. That’s why extra protection is used around wires to prevent EMI.

So, the EMI affects the signals and diminishes the quality. And the performance of the cable. That’s why you might be seeing a bad video or audio on your monitor/screen.

The longer the DisplayPort cable, the more the chance for signal interruption or interference. So longer cables are more susceptible to EMI than shorter cables. That’s why its performance gets affected. And you get poor reception of video and audio signals. There is also a big risk of data loss in long cable signal transmission.

On the other hand, shorter DP cables are not as susceptible to EMI as longer cables. They transmit the signals smoothly and give better performance. And you receive a better and higher resolution of video and audio quality.

However, you can’t use just any length of cable for your computer. There is a specific cable length for DisplayPort. Which will give you the optimal video and audio quality performance.

According to many tech companies, the ideal length for better performance is 1.8 meters. Which is  6 feet. If you use a cable longer than that, you might be facing a weaker signal.

So, using a 1.8-meter cable is the best way to experience optimal performance.

A lot of people think that cable length doesn’t have anything to do with the transmission. They think digital cables don’t get affected no matter how long they are. But this concept is entirely wrong. Here’s why-

A digital cable can only ensure the transmission of the signal to a device. The signal through the cable will be transmitted in packets of data. Which is similar to the transmission of a USB cable. But it has nothing to do with the stability of the signal.

This is where long cables and short cables come into play.

The stability of the signal depends on how long a cable you are using. That’s why digital transmission of data shouldn’t be associated with the length of cables.

However, this transmission delay and data loss does not apply to DisplayPort dongles. Because the length of the dongles is usually short. And they only convert the signals from DisplayPort to any other forms. Such as HDMI.

That’s why you don’t have to worry about the lengths of converters or dongles. Their job is to connect the DP cable port to other ports of different sizes. These cables don’t suffer from the problems a DP cable faces while transmitting data.

What Can I Do To Solve This Long DisplayPort Cable Problem?

It’s ideal to use a DP cable as short as 6 feet for connecting your PC. If you must use a long cable, there are ways you can fix the performance problem.

There are two steps you can take in order to keep signal transmission stable. But you must still try to keep the cable size as small as possible. Let’s take a look at two different options for using a long DisplayPort cable-

Method 1: Use A High-Quality Cable

This method is for those who only need a few extra feet of DisplayPort cable. For changing the position of the PC or television.

In this case, you can try using a good quality DisplayPort cable. Which has a solid braid covering and a good foil shield. Using this cable will help minimize signal interference. And you will receive good uninterrupted video and audio quality.

So if you’re thinking of shifting your TV set or PC to another location. Consider investing in a good quality DisplayPort cable.

Method 2: Use Signal Boosters

This method is for those who need a DisplayCable more than 100 feet. This situation is mostly for classrooms, offices, or auditorium projectors. Because in this case, one must ensure the quality of the video and audio signals.

Signals transmitting in long cables tend to lose data on the way. For that what you can do is use signal boosters at certain points. This will allow the signal to stay stable and strong.

As a result, the video and audio quality will have high-resolution. And the quality will not be diminished while transmitting data.

Using any of the two methods, you’ll be able to use a long wire. However, it’s ideal to keep the length as short as possible.

Should I Still Use DisplayPort Cable?

should i still use displayport cable

Of course, you should choose DisplayPort cable. Whether it’s for setting up your new gaming PC. Or setting a new DVD for your television. DisplayPorts are also best for connecting external graphics cards.

The high resolution of the video and audio quality are worth investing in. Even the refresh rates are better than that of other cables. Such as an HDMI cable supports 5K resolution at 30Hz at maximum. But a DisplayPort cable supports up to 8K resolution at the same Hertz level.

It’s highly accessible and compatible with almost every device. If you don’t have a display port, you can easily use a converter. There are many adapters that convert to DP Cable.

So if you ever choose DisplayPort cable, you’ll never regret using it. The only thing you should be concerned about is the length and signal strength. But these problems can be easily solved using the methods discussed above.


Question: Does DisplayPort cable length matter?

Answer: Yes it does. The longer the cable will be the lower the performance. That’s because the signals get weaker and interfere. And a lot of the data gets lost in the process. That’s why cable length matters and affects the performance of video and audio reception.

Question: What is the max length for DisplayPort cable?

Answer: The maximum length a DP cable can run is 15 meters. This means a Display cable can run up to 15 meters without a booster station. And after that, the performance of the DP cable will diminish.

Question: Are all DisplayPort cables the same?

Answer: There are different kinds of DisplayPort Cable. And all of them have different capabilities. The two popular types of DisplayPort cables are DP cable 1.4 and DP cable 1.2. However, there are other versions of DisplayPort cables. Such as DP cable 2.1 and DP cable 1.3.

Question: Is there a difference between DisplayPort 1.2 and 1.4 cables?

Answer: Yes! There is a difference between the two versions of the DisplayPort cable. These two versions are the most commonly used cables. And they have good video and audio quality. The DP cable 1.2 supports 4K at 60Hz refresh rate. Whereas, DP cable 1.4 supports up to 8K at 60Hz refresh rate. It also supports HDR quality.

Signing Off

I hope we answered your question- does the size of DisplayPort cables affect its performance. If yes, then you can go and measure the DP cable before buying one. In case your PC has a poor resolution, you’ll know where the problem lies.

Let us know if we were able to explain the relation between cable length and resolution.

Till then, keep on connecting.

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