Asus ROG Swift PG248QP 540 Hz gaming monitor review: Raw speed and performance

24-inch FHD TN gaming monitor with 540 Hz, Nvidia’s G-Sync Processor, HDR and wide gamut color.

Asus ROG Swift PG248QP
(Image: © Tom's Hardware)

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The PG248QP ships with a calibration data sheet, but I could not replicate its values without calibrating. The Racing mode is the best starting point for adjustment.

Grayscale and Gamma Tracking

Our grayscale and gamma tests use Calman calibration software from Portrait Displays. We describe our grayscale and gamma tests in detail here.

The PG248QP’s green tint is fairly obvious in the Racing picture mode. Considering the price tag, I’m a bit disappointed here. You’ll need to make some adjustments for the best image quality. Gamma runs a bit light except for a dark spike at the 90% step. This suggests color clipping, which I verified in the tests.

With adjustments to the RGB sliders and a change to gamma 2.4, the picture is greatly improved. Though static contrast is lower, the image has far more depth and dimension because color is more saturated. You’ll see that in more detail below.


The PG248QP starts with a 6.5dE grayscale error, which is higher than that of the other screens. The other Asus, the PG259QN, also needs some tweaking for the best results. The top four can get away with their default settings. After calibration, the PG248QP is still in last place but has no visible errors.

Gamma has a tight range of values with just 0.16 from lowest to highest. With the change to the 2.4 preset, it strays only 1.82% away from the 2.2 reference. The actual value is 2.28. If I can’t nail 2.2, I always choose the darker (higher) value. As you’ll now see, it positively affects color saturation.

Color Gamut Accuracy

Our color gamut and volume testing use Portrait Displays’ Calman software. For details on our color gamut testing and volume calculations, click here.

The PG248QP defaults to its wide gamut for SDR content but under-saturates the inner points. The look is that of sRGB except in the image's brightest and most saturated areas. White balance is green, so it pulls the secondaries (cyan, magenta and yellow) off their hue targets. This isn’t a bad chart, but there is room for improvement.

Calibration makes a huge difference here. Not only are all the hue points on target, but the shift in gamma has also increased color saturation. It’s a bit counter-intuitive to think that reducing static contrast by 30% is good, but in the PG248QP’s case, it is true. The proof is in the visuals. It looks much better than before.


I can’t complain about a color error of 1.74dE. Though it puts the PG248QP last, this is a group of accurate monitors. None of them have any visible errors. Calibration is required to achieve this, but the result is excellent.

In the category of super-fast gaming monitors, none have more color volume than the PG248QP. That creates a visible advantage in color saturation. It is more colorful than any other fast screen, with nearly 90% coverage of DCI-P3. This is a positive enhancement for both SDR and HDR content. The indicated sRGB coverage of 127.29% means that I could not find a true sRGB mode that measured any smaller than the native color space. I doubt anyone springing for a 540 Hz monitor will care about this.

Test Takeaway: The PG248QP’s out-of-box color performance is a little disappointing considering its price tag. But with the right adjustments, it looks a lot better. When compared to other 360 and 500 Hz displays, it lags slightly in these tests, but since you’re reading this, you know how to make it equal to the others.

MORE: Best Gaming Monitors

MORE: How We Test PC Monitors

MORE: How to Buy a PC Monitor

MORE: How to Choose the Best HDR Monitor

Christian Eberle
Contributing Editor

Christian Eberle is a Contributing Editor for Tom's Hardware US. He's a veteran reviewer of A/V equipment, specializing in monitors. Christian began his obsession with tech when he built his first PC in 1991, a 286 running DOS 3.0 at a blazing 12MHz. In 2006, he undertook training from the Imaging Science Foundation in video calibration and testing and thus started a passion for precise imaging that persists to this day. He is also a professional musician with a degree from the New England Conservatory as a classical bassoonist which he used to good effect as a performer with the West Point Army Band from 1987 to 2013. He enjoys watching movies and listening to high-end audio in his custom-built home theater and can be seen riding trails near his home on a race-ready ICE VTX recumbent trike. Christian enjoys the endless summer in Florida where he lives with his wife and Chihuahua and plays with orchestras around the state.

  • javiindo
    Now you need to find a game you can play at 540 hz. Even with dlss3 it's not easy and to use dlss3 initroduce some latency .
  • The Historical Fidelity
    Not to be nit picky but color gamut is normally just a variable of back light and color filter quality. High Color Rendering Index leds emit a higher percentage of the visible light spectrum as well as higher light intensity in the areas of the visible spectrum that normal leds have a hard time producing in quantity (IE: deep reds, and cyan), and color filters can be made to inhibit color cross-talk and optimize polarization states, so I’m confused why sacrificing color gamut is typically correlated to high refresh rate when it does not affect refresh rate in any way?
  • helper800
    If i cared about anything past 240hz, I would wait for a monitor such as the one talked about in this article. LG claims to have achieved 480hz OLED panels at 2560x1440. OLEDs motion clarity as a baseline has been the highest among panel technologies in my experience. My 120hz CX OLED from LG looks better in motion handling that my own 165hz IPS display from viewsonic. Th OLED CX also looks better, imo than my friends non-OLED 240hz samsung panel. If you are going to spend nearly 1000 dollars, imo its better to wait for a bigger leap in tech like the aforementioned LG panels.
  • Phaaze88
    Folks already achieve ultra high fps on monitors that can't display it, so why should they spend money on products like this?

  • UnforcedERROR
    javiindo said:
    Now you need to find a game you can play at 540 hz. Even with dlss3 it's not easy and to use dlss3 initroduce some latency .
    This is a monitor almost exclusively for games like CS2 and Valorant, which aren't hard to run at high FPS. A 4090 at 1080p will get you 800 FPS in Valorant, for instance. A good CPU + GPU will get you the same in CS2 (Source engine is CPU-reliant). It's for the people who want to reduce input latency as low as possible, and it's a fairly niche space.

    That said, I think it's interesting this article credits the VG248 as the monitor that ushered in fast refresh monitors, considering the XL2420T beat it to market by a year, even if it was only 120hz. I'd argue that was the first real high refresh LCD monitor, and I remember it changing the competitive FPS landscape a lot at the time.
  • Tom Sunday
    Phaaze88 said:
    Folks already achieve ultra high fps on monitors that can't display it, so why should they spend money on products like this?

    I can appreciate the mentioning that video processing and speed here are on the next level. I only play three owned games, (Fallout 4, Dishonored and Wolfenstein New Order) will these at anything even close to the processing speed and image smoothness as advertised give me more of a real-live sensation and gaming WOW factor never experienced before? Like repairing the roads and roofs in Sanctuary faster and improving NPC fluidity? Of course true enthusiast gaming today is usually played on a 32-34 inch monitors for all the good reasons. Not customarily on a 24 inch screen! Then today what professional would do actual work on a 24-inch screen? Finally who would buy such monitor and then for almost a WTF $900?
  • CmdrShepard
    This is the lamest and most deceptive review I ever read on Toms Hardware ever since the site was created.

    Why? Because it left out one of the most important tech spec items -- viewing angles.

    Viewing Angle (CR≧10) : 170°/ 160°

    TN panels are fast sure, but they are trash when it comes to viewing angles.

    With 160 degrees vertical viewing angle you just need to slump in your chair a bit, and what you will see on the screen will no longer have any resemblance of the original color and contrast as when you were looking at it dead center at a 90 degrees angle.

    Also, the claim is made in this "review" (more like a paid ad!) that this monitor covers over 89% of DCI P3 color space while the tech specs on ASUS website do not mention DCI P3 support anywhere -- they claim 125% sRGB which is a pure marketing garbage. 25% more than sRGB? in which direction on the color chart?. I checked the ICM profile using ICC Profile Inspector and it turns out only in R and G direction (B is well within sRGB if not a bit less) I doubt that monitor even has a DCI P3 color setting in the menu.

    The author should be ashamed for writing such low quality content.