Can You Extend a Display to a Dell Monitor by Connecting Them to Each Other?
Yes — in most cases, you can extend your display to a Dell monitor, and in some configurations, you can even daisy-chain monitors together. But whether that works, and how well, depends on the ports your devices have, the graphics card driving them, and the display standards involved. Here's what you actually need to know.
What "Extending" a Display Actually Means
When you extend a display, your operating system treats each monitor as a separate screen area. Your desktop stretches across both, giving you more usable workspace rather than mirroring the same image twice.
This is different from mirroring (showing the same thing on both screens) or spanning (older setups where one image stretched across monitors). Extended mode is what most people want for productivity — one screen for your work, another for reference material, communication tools, or media.
Connecting a Dell Monitor to Another Display: The Two Main Scenarios
Scenario 1: Connecting Both Monitors to a Host Device (Most Common)
The most straightforward setup is running two cables from your laptop or desktop — one to each monitor. Your graphics hardware handles both displays independently.
This works when:
- Your host device has two available video outputs (HDMI, DisplayPort, USB-C with DisplayPort Alt Mode, DVI, or VGA)
- Your GPU supports multiple simultaneous outputs
- Your operating system recognizes both displays (Windows, macOS, and most Linux distros handle this natively)
Most modern Dell monitors include at least one HDMI and one DisplayPort input, so mixing connection types is usually possible if your source device supports it.
Scenario 2: Daisy-Chaining Dell Monitors Together 🔗
This is where things get more specific. Daisy-chaining means connecting Monitor A to your computer, then connecting Monitor B directly to Monitor A — running a cable from monitor to monitor.
For this to work, a few conditions must all be true simultaneously:
| Requirement | Why It Matters |
|---|---|
| DisplayPort 1.2 or higher | The standard that enables Multi-Stream Transport (MST) |
| MST support on the monitor | Not all Dell monitors include a DisplayPort Out port |
| GPU with MST support | AMD and NVIDIA both support it; integrated graphics varies |
| DisplayPort In/Out on both monitors | The first monitor needs a DP Out port to pass signal forward |
MST (Multi-Stream Transport) is the technology that makes daisy-chaining possible. It allows a single DisplayPort connection to carry data for multiple displays by splitting the signal downstream. If your Dell monitor has both a DisplayPort In and a DisplayPort Out port, and MST is enabled in the monitor's on-screen menu, daisy-chaining is on the table.
What Limits You: The Variables That Determine Your Outcome
Port Availability
Check what's physically on both your host device and your monitors. A laptop with only one HDMI port and no USB-C DisplayPort support can't natively drive two independent monitors without a dock or adapter. A desktop with a dedicated GPU almost always has multiple outputs.
Bandwidth and Resolution Trade-offs
When daisy-chaining, bandwidth is shared across the chain. Running two monitors at 1080p over DisplayPort 1.2 is generally manageable. Stepping up to two 4K displays at high refresh rates puts real pressure on available bandwidth — you may need to reduce resolution or refresh rate on one or both screens to maintain stability.
DisplayPort 1.4 increases available bandwidth significantly, which helps with higher-resolution daisy-chain setups. Thunderbolt 3 and 4 ports also support daisy-chaining with compatible monitors and docks, with their own bandwidth considerations.
MST vs. SST
Some Dell monitors default to SST (Single-Stream Transport) mode and need to be manually switched to MST in their settings. If daisy-chaining isn't working despite correct cabling, checking the monitor's OSD (on-screen display) menu for an MST toggle is often the fix.
Operating System Behavior
Windows generally handles extended displays with minimal setup — right-click the desktop, open Display Settings, and arrange your monitors. macOS is more restrictive with daisy-chaining unless you're using Thunderbolt/USB-C with supported hardware. Linux support varies by distribution and GPU driver.
The Adapter and Dock Middle Ground
If your source device lacks the ports for a direct two-monitor setup, a USB-C hub or DisplayLink dock can expand your options. These devices create additional video outputs from a single USB-C or Thunderbolt connection. Performance and resolution limits depend on the dock's chipset and your host device's USB bandwidth.
This adds a layer of compatibility variables — the dock, the cable, the monitor, and the host all need to cooperate. It works well in many setups and introduces problems in others, particularly with DisplayLink-based docks on macOS due to driver dependencies.
Different Setups, Meaningfully Different Results 🖥️
A desktop with a mid-range discrete GPU, two DisplayPort cables, and two Dell monitors supporting MST is one of the most reliable extended display setups available — straightforward to configure, stable, and high-performance.
A laptop with a single USB-C port running through a third-party dock to two monitors is functional but introduces more points of potential failure: driver support, dock power delivery, cable quality, and USB bandwidth all become factors.
An older Dell monitor without a DisplayPort Out simply cannot be the middle link in a daisy chain, regardless of what's connected to it — the hardware capability isn't there.
The right approach depends entirely on what you're starting with: your source device's outputs, your monitors' port configurations, your target resolutions, and how much configuration complexity you're comfortable managing.