Dell S2421HGF Review: 1080p 144Hz 1ms FreeSync Gaming Monitor

The Dell S2421HGF is a budget 24" 1080p 144Hz gaming monitor based on a TN panel with 1ms response time and AMD FreeSync support.

Bottom Line

The Dell S2421HGF is an excellent budget 144Hz monitor for competitive gaming. It also supports AMD FreeSync and a height-adjustable design with ultra-thin bezels.

However, most gamers would be happier with an IPS model at this price range due to their wider viewing angles and better image quality with similar performance.


The Dell S2421HGF is a budget 24″ 1080p 144Hz monitor aimed primarily at competitive gamers who prefer performance over image quality due to its TN panel.

Unlike most models with similar specifications though, the Dell S2421HGF features a nice design with ultra-thin bezels and a height-adjustable stand!

Image Quality

Based on a TN (Twisted Nematic) panel, the monitor has narrow viewing angles of 170° horizontally and 160° vertically, meaning that the picture will shift in brightness, contrast, and color when looked at an angle.

As long as you’re sitting directly in front of the monitor, this won’t be an issue. Some vertical gamma shifts can be detected, but luckily, you can adjust the angle and the height of the screen to mitigate this.

The Dell S2421HGF has a specified color gamut of 72% NTSC, which is equivalent to ~100% sRGB gamut size. However, this doesn’t mean that the monitor covers the whole sRGB gamut.

There is some minor extension beyond the sRGB color space at places, but some undercoverage of it as well. Generally, you can expect 90% – 95% coverage of the sRGB color space, depending on the factory-calibration of an individual unit of the monitor.

For gaming and other everyday use, this won’t a problem, but naturally, due to the narrow viewing angles and inconsistent colors of the panel, we don’t recommend the Dell S2421HGF for any type of color-critical work.

Other panel-related specifications include a 350-nit peak brightness, which makes the monitor more than bright enough under normal lighting conditions – and a static contrast ratio of 1,000:1, which is standard for TN and IPS monitors at this price range.

You won’t get as deep blacks as that of VA panels with a ~3,000:1 contrast ratio, but these monitors have other disadvantages at this price point, such as a considerably slower pixel response time speed.

Just like most ~24″ 1080p monitors, the Dell S2421HGF uses dithering to achieve 8-bit color depth for 16.7 million colors (6-bit + 2-bit FRC).

The Full HD resolution results in a decent pixel density of ~93 PPI (pixels per inch) on the 23.8″ viewable screen of the monitor. This means that you get a fair amount of screen real estate, as well as reasonably crisp details and text.


Moving on, the Dell S2421HGF has a fast 1ms GtG (gray to gray pixel transition) response time speed, which eliminates trailing behind fast-moving objects.

There are three response time overdrive modes: Fast, Super Fast, and Extreme. The ‘Extreme’ is the fastest and it doesn’t introduce much overshoot, so we recommend using it at 144Hz.

If you’re using variable refresh rate (VRR) and your frame rate sits around 60FPS, dialing back the overdrive to Super Fast can provide better results.

AMD FreeSync is supported with a 48-144Hz VRR range for tear-free gameplay up to 144FPS. Below 48FPS, LFC (Low Framerate Compensation) multiplies the frame rate (47FPS x 3 = 141Hz) to prevent tearing.

It’s supported over both HDMI and DisplayPort, and while the monitor is not officially certified as ‘G-SYNC Compatible’ by NVIDIA, you can use FreeSync with GeForce graphics card over DisplayPort as well, without any issues.

The Dell S2421HGF input lag amounts to only ~4ms, which makes for imperceptible delay.


Dell S2421HGF On Screen Display Menu

The OSD (On-Screen Display) menu is well-organized and easy to use thanks to the directional joystick placed at the rear of the Dell S2421HGF monitor.

There are four additional hotkeys below the joystick, three of which can be used for custom shortcuts, while the power button is at the right side of the monitor, below the bottom bezel.

Useful gaming features include Dark Stabilizer (improves visibility in darker games), on-screen timers, a refresh rate tracker, and various picture modes (FPS, RTS, MOBA/RTS, and three customizable Game profiles).

You’ll also find advanced image adjustment tools, such as hue, saturation, and sharpness, besides the common brightness, contrast, and color temperature settings. There are no gamma modes, though.

Finally, the monitor is flicker-free and applies a low-blue light filter once you select the ComfortView picture mode.

Design & Connectivity

Dell S2421HGF Monitor Back

The design of the monitor is quite decent considering the price. It has a sturdy stand that’s height-adjustable by up to 100mm. You can also tilt the screen by -5°/21° or mount it via the 100x100mm VESA pattern.

Further, the screen has ultra-thin bezels at the top and at the sides, which is rare for these budget 24″ 1080p 144Hz TN monitors. The 25% low-haze anti-glare matte screen finish prevents reflections without making the picture appear grainy.

Connectivity options include two HDMI 1.4 ports, DisplayPort 1.2, and a headphones jack. All display inputs support 144Hz at 1920×1080.

The 1080p 120Hz mode is also supported for the PS5 and Xbox consoles.

Price & Similar Monitors

The Dell S2421HGF goes for ~$180.

We recommend getting the LG 24GN650/GN600 instead for the same price. It’s equally fast but also offers better colors, wider viewing angles and MBR.

Visit our always up-to-date best gaming monitor under $200 buyer’s guide for more information and monitor options.


The Dell S2421HGF is an overall excellent budget monitor for competitive gaming, but unless you’re a particularly hardcore player, we recommend going with an IPS alternative.


Screen Size23.8-inch
Resolution1920×1080 (Full HD)
Panel TypeTN
Aspect Ratio16:9 (Widescreen)
Refresh Rate144Hz
Response Time (GtG)1ms (GtG)
Adaptive-SyncFreeSync (48-144Hz)
PortsDisplayPort 1.2, 2x HDMI 1.4
Other PortsHeadphone Jack
Brightness350 cd/m²
Contrast Ratio1000:1 (static)
Colors16.7 million (6-bit + FRC)
VESAYes (100x100mm)

The Pros:

  • Quick response time and low input lag
  • Plenty of gaming features including FreeSync up to 144Hz
  • Height-adjustable stand

The Cons:

  • Inferior image quality to IPS and VA panels
  • Narrow viewing angles
  • Design lacks pivot/swivel
  • No MBR

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Rob Shafer

Rob is a software engineer with a Bachelor’s degree from the University of Denver. He now works full-time managing DisplayNinja while coding his own projects on the side.