No, HDMI Splitters Aren’t for Extended Dual Monitors, 3 Alternatives Inside!

using an hdmi splitter to utilize dual monitors

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What To Know

  • HDMI splitters cannot extend displays for dual monitors; they can only duplicate the same image across both screens.
  • For dual monitors with an extended setup, consider using a USB to HDMI adapter, multiple different graphics ports, or daisy chaining.
  • To determine if your PC or laptop can support multiple displays, check the number of graphics ports or consult the manufacturer’s website for detailed specifications.

Understanding how to effectively set up dual monitors can transform your computing experience.

This guide will explain how an HDMI splitter actually works and also introduce you to three other methods for creating an extended multi-monitor setup.

What Does an HDMI Splitter Do?

HDMI splitters work by transmitting the AV signals from one source to multiple displays. This allows you to view your source device’s display on several monitors at once in duplicate/mirror mode.

However, HDMI splitters can not extend your screen. So, if you’re looking to expand your workspace with two monitors, then it’s best to try another method.

In case you’re still interested in learning how to use an HDMI splitter for setting up duplicated dual monitors, a step-by-step guide is provided in the final section for your convenience.

3 Alternative Methods to Set Up Dual Monitors

This article answers the question about HDMI splitter for dual monitors, so I assume that you guys have a least two monitors.

However, if you’re currently working with just one (external) monitor, don’t worry—the solutions here are still applicable to you

Note: the methods below work well with both macOS and Windows OS. If you’re unsure about your laptop or PC’s multi-monitor support, proceed to the next section.

Use a USB to HDMI Adapter or Two Different Graphics Ports

The Asus laptop is extended the screen to LG portable monitor and TCL TV via HDMI cable and thunderbolt cable

Have you read our dedicated article on this topic? If you’re curious, feel free to explore further by visiting this link. To summarize, the article will be about:

  • A USB to HDMI adapter can be a handy tool. It transforms a USB port into an HDMI connection, allowing you to connect two HDMI-compatible monitors simultaneously.The diagram showing the connection of a laptop to two monitor via the USB to HDMI adapter
  • If your computer is equipped with various types of graphics ports (like VGA, DVI, or DisplayPort), you can connect each monitor using the appropriate cables.A diagram of the connection from a laptop via two monitors using HDMI cable and thunderbolt cable

While our featured article mainly discusses HDMI ports, the guidelines are still relevant.

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Use Daisy Chain

Daisy chaining is an efficient way to link multiple monitors using the fewest cables possible. To successfully implement this method, ensure your devices meet these criteria:

  • Thunderbolt 3 or higher
  • DisplayPort 1.2 or higher
  • Monitors must have at least two Thunderbolt ports or one Thunderbolt port coupled with one DisplayPort
  • The laptop must possess either a DisplayPort port, a USB-C port with DisplayPort Alt Mode, or a Thunderbolt port

To set up a daisy chain using Thunderbolt ports, follow these steps:

Step 1: Power on all the devices involved in the setup.

Step 2: Plug the Thunderbolt (USB-C) cable into the Thunderbolt ports of your laptop and the first monitor.

Step 3: Plug the other Thunderbolt cable into the Thunderbolt ports of your two monitors.

Daisy Chain: One Cable to Connect all Your Monitors

For daisy chaining via DisplayPort, the process is as follows:

Step 1: Power on all the devices in the setup, and activate the DisplayPort 1.2 or MST feature of your monitors.

Step 2: Plug the Thunderbolt (USB-C) cable into the Thunderbolt ports of your laptop and the first monitor.

Or plug the DisplayPort cable into your laptop monitor’s DisplayPort Out and the first monitor’s DisplayPort In.

Step 3: Use the DisplayPort cable to link your first monitor’s DisplayPort Out to the second monitor’s DisplayPort In.

How to connect multiple monitors with daisy chain (MST)- BenQ GW2485TC/ GW2785TC

How to Check If Your PC/Laptop Supports Multiple Displays

Before you jump into setting up dual monitors, it’s essential to verify if your PC/laptop can handle multiple displays.

For a general check, just count the number of graphics ports on your laptop or eGPU. For a more in-depth analysis, however, you’ll need to refer to the manufacturer’s website for detailed specs.

For instance, my Acer Aspire 7 A715-G42, equipped with a GeForce GTX 1650, has only one HDMI port. Based on a basic check, this suggests I can connect to only one external monitor.

a laptop's hdmi port is highlighted

However, the story doesn’t end there. The eGPU (external graphics unit) of my laptop actually supports up to three graphics ports.

This means my laptop is capable of outputting to at least two external monitors, in addition to the laptop’s screen, when used with a docking station.

how to check the exact number of monitor an egpu supports

The discrepancy between the single HDMI port on my Aspire 7 A715-G42 and the three graphics ports supported by the eGPU (as listed on NVIDIA’s website) may be because when installed on a laptop, the number of ports is reduced for a neat design.

But when the GTX 1650 eGPU is installed in a PC, all three ports are available.

Therefore, I’ll guide you through checking your computer’s multi-display actual capabilities, whether yours is Windows or macOS.

Windows OS

Given that most Windows laptops and PCs incorporate an eGPU, I’ll show you how to check its multi-display capability.

Modern eGPUs are primarily manufactured by NVIDIA or AMD, so I’ll demo the guide with my Aspire 7 A715-G42, which houses a GeForce GTX 1650 (G6).

Step 1: Press the Windows button, and type “Device Manager” into the search bar.

device manager is entered on a searchbar of a windows computer

Step 2: Click on the Arrow icon next to Display adapters.

The first GPU listed is the integrated one, while the second is the eGPU. Take note of your eGPU model.

display adapters is highlighted, a gpu is pointed at

Step 3: Visit the manufacturer’s website – in my case, NVIDIA – so I visited their website and looked for my model, which is GTX 1650 (G6).

gefore gtx 1650 (g6) is highlighted

I knew my GTX 1650 eGPU was a G6 variant because when I looked up my laptop’s specs (Aspire 7 A715-G42), I noticed its Graphics Memory Technology was GDDR6, which meant G6.

gddr6 specs of a laptop is highlighted

Step 4: Navigate to the Multi Monitor row, and you will see two kinds of answers.

With my GTX 1650, the site only confirms it supports multi-monitor setups (with the Yes cell).

This means the number of graphics ports is the exact number of monitors that the GPU supports.

Therefore, I had to count the number of ports listed under Standard Display Connectors, which were three.

how to check the exact number of monitor an egpu supports

For other eGPU models, like the GTX Series 20, you might find a specific number of monitors supported.

The counting method in this case will be wrong as you can see in the image below, the number of graphics ports of GeForce RTX 2070 Super is only two while the Multi Monitor row shows up to four monitors supported.

an egpu has two graphics ports only but supports up to four monitors


Step 1: Open the Apple menu, and choose About This Mac.

about this mac option is highlighted

Step 2: In the Overview tab, look for your Mac model.

a macbook model name is highlighted

Step 3: Search online for your model name + “specs”, and click on the Apple website.

search for a macbook model on google, apple support website and the search bar are highlighted

Step 4: Look for anything related to the external display connectivity.

a macbook specs showing that it supports up to two external displays

How to Duplicate Screens Using an HDMI Splitter

HDMI splitters should be used if you want to create a duplicate/mirror setup since the splitter can only duplicate the main screen’s contents, allowing the second screen to display the same image/video.

Follow the steps below to use an HDMI splitter for your dual-monitor setup.



Step 1: Plug the HDMI splitter’s HDMI connector into your source device.

Step 2: Plug one end of an HDMI cable into one of the HDMI splitter’s HDMI OUT ports and the other end into your monitor’s HDMI IN port.

Step 3: Repeat Step 2 with the other HDMI cable and monitor.

Now you’re ready to use your duplicated/mirrored dual monitor setup!

Please note that HDMI splitters will not work for any of the following setups:

  • Extend
  • PC/Main Screen Only
  • Second Screen Only

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