Asus ROG Swift PG27UCWM gaming monitor review: Speed and pixel density in a premium package

Asus has introduced some of the best OLED gaming monitors in recent years, and with each generation, it makes incremental improvements in performance, features, and technology. Its latest panel type is Tandem RGB Stripe, bringing higher brightness, a wide color gamut, sharper imagery, and lower power consumption.

The latest ROG Swift display to hit my test bench is the PG27UCWM. It’s a 27-inch 4K panel with 240 Hz (480 Hz in FHD), HDR10, Dolby Vision, DisplayHDR 400, and Adaptive-Sync. Let’s take a look.

Asus ROG Swift PG27UCWM Specs

I’ve reviewed a few Tandem RGB Stripe OLEDs of late, most recently, Asus’ 32-inch version of this screen, the PG32UCWM. There’s no denying the extra sharpness that this tech brings. Though I never saw much color fringing around text as discussed online, these new panels are clearly sharper than single-layer OLEDs. By sandwiching two layers and making the pixels’ physical shape narrower, you get more clarity, more color, and more brightness at a given wattage. And by driving the panel less aggressively, its lifespan is extended.

The PG27UCWM’s color volume is greater than that of single-layer OLEDs but not quite as large as that of Quantum Dot displays. I measured just over 102% coverage on my sample, whereas you’ll get closer to 110% with a QD monitor. Asus includes factory calibration with each monitor, and you can find that stored in firmware and accessed through the comprehensive OSD.

Peak brightness is just under 500 nits when measuring a 25% window pattern with uniform brightness turned off. That number holds for both SDR and HDR content. The PG27UCWM supports HDR10 and Dolby Vision, with VESA DisplayHDR 400 certification. Asus’ TrueBlack Glossy screen coating keeps reflected light from spoiling those deep black levels.

In the video processing department, Asus includes a dual-refresh feature called Frame Rate Boost that switches between 4K/240 Hz and Full HD/480 Hz. You can change modes with a single button press. Also in the mix is Adaptive-Sync, with certifications from both Nvidia (G-Sync) and AMD (FreeSync Premium Pro). And you can augment lower frame rate capable systems with ELMB (Extreme Low Motion Blur).

The PG27UCWM, like all ROG Swift products, is feature-rich. You get Asus’ GamePlus enhancements, including multiple aiming points, sniper modes, frame rate counters, timers, and alignment marks. The quick menu and joystick clicks are fully customizable for quick access to many functions. And you can download Asus’ DisplayWidget Center app for full control on Windows or Mac desktops. A full array of inputs includes DisplayPort 2.1 with 80 Gbps bandwidth, HDMI 2.1, USB-C, and a USB 3.2 hub with KVM options.

There are plenty of cables included, along with Asus’ signature LED lighting and graphics. The PG27UCWM is firmly in the premium segment at a starting price of $1,099. I would expect greatness for that sum, and if you read on, we’ll see if it delivers.

Assembly and Accessories

The PG27UCWM arrives in a well-adorned carton with colorful graphics and secure, recyclable packaging. The base, upright, and panel are separate, as is the lens for the ROG logo projector that shines symbols on your desk. It includes multiple lenses. The ROG pouch reveals cables for USB, HDMI, and DisplayPort, plus IEC for the internal power supply. There’s also a heavy stamped steel bracket that snaps onto the panel to create a 100mm VESA mount.

Product 360

The PG27UCWM features Asus’ latest ROG Swift styling cues, with clear plastic on the back that reveals some of the monitor’s internal components. Opposite that is the Lite Brite ROG graphic that can light up in a multitude of colors and effects. More LEDs can be found on the front, on the small protrusion beneath the screen, as well as on the base and even the sliding bit on the stand’s upright. All this fun can be controlled in the OSD and by DisplayWidget Center.

In front, the bezel is very narrow on all sides, just 9-11 millimeters, with a small protrusion at the bottom center for the joystick and control buttons. It also contains a sensor that works with the OLED care features to shut off the panel when you leave your desk.

From the side, you can see the panel-on-box design that is common to many OLEDs. This not only looks nice but aids in cooling. The OLED is backed by a metal plate that helps dissipate heat, along with a graphene layer inside, heatsinks on the internal circuit boards, and a heat-efficient power module. The PG27UCWM is fanless and always ran cool during my time with it.

The stand is very solid with a cast aluminum base that is both wide and deep. The upright features full ergonomics with a 4.4-inch height range, 5/20-degree tilt, 30-degree swivel, and a 90-degree portrait mode. Movements are firm and smooth with no wobble or play. The stand also has a threaded tripod socket on top for things like webcams.

The I/O panel is well-appointed with a single DisplayPort 2.1 (UHBR20, 80 Gbps), two HDMI 2.1, a USB-C, and a USB hub with one upstream and three downstream. The hub has full KVM functionality, along with version control and power for the USB-C up to 90 watts. There are no internal speakers, but you do get a 3.5mm headphone jack.

OSD Features

The PG27UCWM has two buttons and a joystick to cover all monitor functions. Pressing the left button switches the refresh rate between 240 Hz and 480 Hz. The right button is a power toggle. Pressing the joystick brings up a quick menu which is fully programmable. A second press reveals the full OSD.

The quick menu has four slots for any function you might want quick access to, like picture mode, brightness, and the like. The full OSD starts with Gaming, and there, you’ll find the GamePlus suite with a large selection of aiming points, sniper modes, frame counters, timers, a stopwatch, and display alignment marks. GameVisual refers to the nine picture modes, each aimed at different game types or tasks. Racing is the default and best choice there.

The PG27UCWM is one of the few monitors to support Dolby Vision in addition to HDR10. Dolby Vision uses dynamic tone mapping from the content metadata to tailor its luminance curve for each individual display. This renders the content more faithfully and with more impact than the fixed tone curve from HDR10 material. For that format, you get four more modes with the option to adjust brightness and other parameters.

To adjust color, the PG27UCWM includes a gamut selector, gamma presets, and color temps arranged by Kelvin value. You can also adjust RGB sliders for finer control. My sample was nearly perfect out of the box, and I could only make a tiny difference with calibration.

OLED Care includes many toggles for screen savers, logo detection, and more. Pixel Cleaning is a panel refresh feature that takes about six minutes to complete. When I first powered up the PG27UCWM, it prompted me to do this. I’ve found this to improve screen uniformity with brand-new panels, so I make it a habit for every review. A front-mounted sensor can be configured to shut off the monitor when you leave your desk.

To view two video sources simultaneously, use the PIP and PBP options. Each can have its own color settings, and you can size the PIP window. Aura RGB is the lighting feature, and it offers a wide range of effects and colors. Light In Motion works with the DisplayWidget Center app to create light shows that mimic what’s happening on the screen.

The quick menu and joystick are fully programmable, so you can access up to 9 functions quickly. This is great for switching inputs, adjusting brightness, changing the refresh mode or what have you. Also included are two memory settings.

The System Setup menu can be left alone in most scenarios, but one option you must address is the Power Setting. It’s on Power Saving by default, and that limits brightness. Switch to Performance Mode to unlock the PG27UCWM’s full potential.

Asus ROG Swift PG27UCWM Calibration Settings

The PG27UCWM measured close to spec out of the box for grayscale and color, but I noted a slight gamma shift. To improve this metric, I selected the 2.4 preset, which made it a tad darker in a good way. I also adjusted the RGB sliders for a tiny gain in grayscale accuracy. For gaming, calibration is completely unnecessary. My suggested settings are below and include brightness values for Uniform Brightness on or off.

For HDR10 content, I recommend the Gaming HDR mode even though its EOTF tracking is lighter than spec. You can read more about this on page five. For spot-on HDR, True Black mode is the winner.

Gaming and Hands-on

I have yet to game on an Asus OLED that wasn’t addictive in its imagery and responsiveness. The PG27UCWM was no exception. It’s super quick with no perceptible input lag and perfectly smooth motion resolution. For frame rates, I tried both modes, 240 and 480, and had excellent results. With a GeForce RTX 4090 in my test PC, I kept the action at 220-230fps in 4K with HDR enabled. This was awesome, to say the least, with every detail rendered sharply whether static or moving. I knew my system was working hard because the fans ran fast and there was a good bit of warm air circulating about my legs as I dispatched enemies in Doom Eternal.

To switch refresh modes, I had to exit to the Windows desktop to prevent the game from crashing. This is typical of the dual-refresh monitors I’ve reviewed and has nothing to do with their operation. At 480 Hz in FHD resolution, the picture was softer but not tremendously so. Games were just as playable and addictive. I kept the frame rate locked at 480 fps across all scenarios. It didn’t make play better for me, but I can see the advantage for users with slower PCs. Or if you just want to brag about frame rates.

HDR color and contrast were exemplary, and I toggled between two HDR picture modes: Gaming and True Black. You’ll see the technical differences between them on page five, but visually, Gaming provided a bit more brightness while True Black had better midtone contrast. It came down to game type for me. Bright outdoor scenery looked better in Gaming while dark imagery looked better in True Black. As with the frame rate boost feature, switching HDR modes should be done on the Windows desktop rather than in a game.

I noted light gamma during testing, which in SDR mode manifested as a slight flattening of the image. I fixed this by upping the gamma setting to 2.4 and raising the brightness value a few points. This added more texture to the picture, which was easy to see in a side-by-side comparison. For a more scientific explanation of the PG27UCWM’s gamma performance, see my test results on page four.

Like all Asus ROG Swift displays, the PG27UCWM is premium in every respect. It looks great just sitting on a desk with its clear back and extensive but not garish lighting. I turned on all the Aura RGB elements and enjoyed the show without distraction from games or work. The accents are well-balanced, even down to the logo projector, a feature unique to Asus ROG Swift monitors.

The Tandem RGB Stripe panel was visibly sharper than last year’s Quantum Dot-based PG27UCDM. The difference is small, but it is there. Text was rendered with perfect edges, free of artifacts such as fringing or jaggies. I could also see a difference in photos, especially when zooming in to the pixel level. This is a great monitor for content creation and writing. I also appreciated the inclusion of Dolby Vision for watching movies and TV shows. There is a lot of DV content on disc and through streaming services like Netflix, Disney+, and HBO Max.

The PG27UCWM has plenty of convenience features, such as USB ports with KVM and a tripod thread on the stand. But I missed internal speakers. Game sound had to come through headphones plugged into the provided 3.5mm jack.

Takeaway: The PG27UCWM is a supremely versatile monitor with lots of features, premium styling, excellent build quality, and top-level game performance. Competitive gamers will appreciate its advanced video processing, low input lag, and smooth response. Image quality is also top-shelf with accurate and saturated color, high luminance, and a variable brightness option. The Tandem RGB Stripe tech delivers a sharper picture than Quantum Dot or single-layer OLEDs.

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When I looked for 27-inch 4K OLEDs to compare to the PG27UCWM, I didn’t find many in the database. It is still an unusual format compared to 32-inch 4K or 27-inch QHD. The group consists of Alienware’s AW2725Q, ViewSonic’s VX2738-2K (QHD), Asus’ PG27UCDM, BenQ’s EX271UZ, and Acer’s X27 X1. All run at 240 Hz.

Pixel Response and Input Lag

Click here to read up on our pixel response and input lag testing procedures.

My data on the BenQ, Alienware, and Asus PG27UCDM predates my LDAT tests, so they are not included in the response results. Thus far, I haven’t seen much variation in OLED panel times. They range from 0.12 to 0.24ms, which is a tiny difference that can’t be seen with the naked eye. That’s why OLEDs all look smooth at 200fps or more. I noted that the PG27UCWM was quicker at 480 Hz than 240, but not by half: 0.12 versus 0.20ms.

In the lag test, the frame rate boost doesn’t provide an advantage in input lag. Even a Jedi Knight won’t be able to tell a 0.6ms difference. Either way, the PG27UCWM has the lowest input lag of any 27-inch 4K OLED I’ve tested, by a small margin over the Acer and ViewSonic screens. Gamers will want to check one of these out for their competition kit.

Test Takeaway: The PG27UCWM is the quickest 27-inch 4K OLED panel I’ve tested to date. It has very low input lag, and panel response is smooth in either frame rate mode. 480 Hz provides a boost in frame rates and is useful for slower systems, but it does not provide lower input lag. If you have enough video card power, the 240 Hz mode is more than adequate for instant control response and smooth motion resolution.

Viewing Angles

In my experience, the one weakness of Tandem RGB Stripe OLED panels is their slight color shift in the horizontal plane. There is no reduction in brightness or gamma, but there is a reddish-green (greenish-red?) tint, a bit like an IPS monitor. For a 27-inch panel like the PG27UCWM, this isn’t a big deal. Just don’t share it with another user who is picky. The vertical photo shows reduced gamma and the same color shift.

Screen Uniformity

To learn how we measure screen uniformity, click here.

The PG27UCWM’s screen uniformity is in line with other OLEDs. I have yet to find a bad one. I recommend that anyone buying an OLED run the pixel refresh routine when you first unpack it. This often yields a 5-10% improvement in uniformity.

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To read about our monitor tests in-depth, please check out Display Testing Explained: How We Test PC Monitors. We cover brightness and contrast testing on page two.

Uncalibrated – Maximum Backlight Level

I measured the PG27UCWM in its Racing mode with the Power mode set to Performance and the brightness slider maxed. With Uniform Brightness (UB) off, a 25% window came up just short of 500 nits, and a full field was 278 nits. UB on kept that same 278 nit value for both window and field patterns. I noted that the PG27UCWM was a tad brighter than last year’s PG27UCDM, which had a Quantum Dot panel. Black levels and contrast could not be measured.

After Calibration to 200 nits

Calibration made no difference to contrast or black levels. When switching between UB modes, I noted that the PG27UCWM saved the brightness value for each mode. That means you can equalize brightness by using a full field for UB on and a 25% window for UB off. As is typical for OLEDs, I could not measure the intra-image (ANSI) contrast.

Test Takeaway: The PG27UCWM delivers contrast and black level performance identical to other OLED monitors. It nearly hits 500 nits for a 25% window pattern with Uniform Brightness switched off. Leaving it on delivers around 278 nits peak.

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In the PG27UCWM’s Racing picture mode, there is no need for calibration, but you have the option to change color space, gamma, and white balance if you wish.

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.

In the first chart, grayscale tracking is visually perfect with no error exceeding 2dE. The accepted visible threshold is 3dE. Gamma is a bit skewed, though. It’s too light in the darkest parts of the image, and midtones are also a little under. This flattens the image a little. At 90% brightness, it is slightly dark, which also lessens the picture’s impact.

I calibrated the RGB sliders for a tiny improvement in grayscale. For gamma, I could only pick a different preset, so I opted for 2.4, which was a good compromise. Since OLEDs have such high contrast, it’s easier to get away with dark gamma because you can just click up the brightness a bit to compensate. A perfect trace on the 2.2 reference would be better, but I don’t expect anyone to complain about the PG27UCWM.

For sRGB, you can either pick the sRGB Cal mode or select sRGB from the color space options in the Color menu. I chose the latter because it leaves the RGB and gamma controls available. Gamma is still a bit light but also more consistent.

Comparisons

The PG27UCWM wins the out-of-box grayscale comparison with an excellent 0.94dE score. Calibration only improves that to 0.91dE. The two Asus and the Alienware screens can be used without calibration, but the Acer, ViewSonic, and BenQ should get some attention for top performance. Once adjusted, the six monitors are visually equal.

In the gamma test, the PG27UCWM runs mid-pack with a 0.25 range of values and a 4.09% deviation from 2.2. I made a compromise here, setting gamma to 2.4. If you leave it on 2.2, the value range is the same and the deviation is 3.18%. But I preferred the look of the darker gamma setting. Try both to see which works best for you.

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.

Asus’ latest crop of Tandem RGB Stripe OLEDs all come within a whisker of 100% coverage of DCI-P3 and display near-perfect accuracy. In the default chart, the PG27UCWM is a tad undersaturated in the primary colors, but not by a visible amount. My grayscale calibration adds just a little verve to the palette. You can barely see a difference, but it’s there when comparing screens side-by-side. This is excellent performance.

The sRGB gamut is also a bit undersaturated, coming up short in red, magenta and blue. This is a minor issue, but users needing the nth degree of accuracy might want to consider a color lookup table for their applications.

Comparisons

A 1.05dE color gamut error is impressive, but all the screens perform as well as the PG27UCWM in this test. OLED is an accurate monitor category, and you’ll be hard-pressed to find a bad one.

I’ve commented that Quantum Dot OLEDs have greater color volume than Tandem RGB Stripe panels, but in the 27-inch category, the differences are quite small. Asus’ own PG27UCDM has less than 1% more volume, an invisible amount. The ViewSonic will look a bit more colorful in a side-by-side comparison, but only slightly. The PG27UCWM delivers vivid and bold hues for both SDR and HDR. The sRGB mode is slightly undersaturated in red, magenta, and blue, hence the 91.87% score.

Test Takeaway: The PG27UCWM is very color-accurate out of the box but needs some attention in the gamma department. I had to compromise for the best picture because none of the presets are exactly on the 2.2 reference. The sRGB mode is slightly undersaturated and has light gamma. Color volume is high and nearly equals that of many Quantum Dot displays. The PG27UCWM is a very colorful monitor.

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Our HDR benchmarking uses Portrait Displays’ Calman software. To learn about our HDR testing, see our breakdown of how we test PC monitors.

The PG27UCWM adds extra HDR brightness and Dolby Vision to its feature list over last year’s PG27UCDM. It switches automatically when an HDR10 signal is detected and offers four picture modes with an adjustable option.

HDR Brightness and Contrast

To get the brightest HDR, I opted for the Gaming mode with the Adjustable toggle turned on. This delivered almost 500 nits from a 25% window pattern. Asus claims 1,000 nits for a 3% window, and there is no reason to doubt this. If you’re considering an upgrade from last year’s PG27UCDM, you can expect an extra 30 nits of peak brightness, about 6%. The Gaming HDR mode comes with a compromise, which I’ll tell you about below. If you choose the most accurate mode, True Black, it peaks at around 470 nits. Black levels and contrast could not be measured.

Grayscale, EOTF and Color

The first two charts illustrate the difference between Gaming and True Black modes. Gaming is a little brighter, not only because it peaks higher, but also because it rides above the EOTF reference. This gives the image a little more impact but also a little less texture. The difference is small and will come down to user preference. For games with bright scenery and color, I preferred Gaming HDR. But more subdued tones benefitted from True Black and its deeper shadows. Either way, you get excellent grayscale accuracy.

In the HDR color tests, the PG27UCWM makes full use of its large gamut in all content. The DCI-P3 is fully covered with a little extra verve in red, magenta, and blue. By emphasizing the warmer tones, it gives the picture more punch without becoming unnatural. This is an approach shared by many HDR monitors, LCD and OLED. In the BT.2020 test, the PG27UCWM runs out of color at 90% red, 75% green, and 95% blue, which is comparable to many Quantum Dot screens.

Test Takeaway: The PG27UCWM delivers a lot of HDR impact and is a little brighter than its predecessor and the other 27-inch 4K OLEDs I’ve tested. It has excellent grayscale and color accuracy in either Gaming or True Black modes. For the best luminance tracking choose True Black and for the brightest image, choose Gaming. Either way, it renders HDR content beautifully.

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Though OLED prices in general have crept downwards, it is still a premium category. New panel variants keep the technology moving forward and create more choices for buyers. It’s also a product category that embodies the concept that you never regret buying the best. With stunning images, bold color, and lightning-fast reflexes, OLEDs are the go-to display for gamers of all skill levels.

Asus has remained at the forefront of OLED technology by being early out of the gate with each new panel tech. It has fully embraced Tandem RGB Stripe with the ROG Swift PG27UCWM. Though relatively expensive for a 27-inch monitor, it is richly featured and capable of truly addictive gameplay. With 240 Hz in 4K and 480 Hz in Full HD, it can pair well with just about any gaming system from console to bleeding-edge PC. In my tests, it proved faster than all the other 27-inch 4K OLEDs I’ve reviewed.

Tandem RGB Stripe also delivers a visible improvement in sharpness. OLEDs were sharp already, but I could easily see the difference when comparing the PG27UCWM to a single-layer monitor. Color is also a highlight here. Though a Quantum Dot screen will get you a little more color volume, the PG27UCWM is still in the mix at over 102% DCI-P3 coverage. And its HDR prowess is substantial with the addition of Dolby Vision.

If you have the budget, currently $1,099, for a premium 27-inch OLED gaming monitor, the Asus ROG Swift PG27UCWM is sitting nicely atop the performance heap. Gamers looking for a premium experience should definitely check it out.

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