KTC G27P6S Review: 1440p 240Hz OLED Gaming Monitor

The KTC G27P6S is a 27″ 1440p 240Hz gaming monitor based on LG’s W-OLED panel with MLA+ technology, which offers a boost in peak brightness.

It also offers plenty of features, including USB-C with DP Alt Mode and 65W, as well as integrated KVM functionality and dual 5W speakers.

Let’s see how it handles our tests!

Note that there’s also the KTC G27P6 variant, which uses the older 27″ 1440p 240Hz W-OLED panel without MLA+ and has a lower peak brightness.

Image Quality

First, we’re using our Calibrite Display Pro HL colorimeter and DisplayCAL to test how the monitor performs out of the box and if there are any settings you can make to improve the image quality.

In the OSD (On-Screen Display) menu, under the ‘Display’ settings, you’ll find several ‘Preset’ options: Standard, User (Default), Movie, Photo, ECO, Reader, RTS and FPS.

Most of these options just have different brightness and contrast values pre-set that cannot be adjusted by the user. So, for full customization, we recommend using the default ‘User’ mode.

You’ll find more picture presets under ‘Color’ settings with a few different ‘Colour Gamut’ options, including Normal (default), sRGB, DCI-P3 and Display P3.

The Normal mode has the native color gamut with a wide 138.1% sRGB color volume (99.8% sRGB color space coverage), resulting in vibrant colors.

However, when viewing SDR content in Windows, the colors will be over-saturated. Some users might prefer this extra color vibrancy, but if you’d rather have more accurate colors, you can use the sRGB mode, which clamps the gamut down to 93.2% volume (91.8% coverage).

This is a bit more aggressive than we’d like (at least 95% sRGB coverage), but it’s good enough for everyday SDR use.

Using AMD’s Custom Color setting (or the third-party novideo_srgb tool for NVIDIA cards), we managed to get slightly better results at 97.3% volume (93.1% coverage) over DisplayPort. Software clamping didn’t seem to work over HDMI though.

For the best accuracy, you’ll need to calibrate the monitor yourself using a colorimeter.

Alternatively, you can use our ICC profile to create a 3D LUT and apply it using the dwm_lut tool. The process is quick and simple and there’s a step-by-step explanation in our sRGB emulation article. Using this method, we managed to clamp the gamut to 100% volume and 99% coverage!

Going back to the monitor’s sRGB mode – it has excellent factory calibration with a low average Delta E of 1.34 (target is < 1.5), and a low maximum Delta E of 2.86 (target is < 3). Gamma tracking is also very good at 2.11 (target is 2.2), and the color temperature is decent at 6245K (target is 6500K) – it’s a bit on the warmer side, but there’s no noticeable tinting to whitepoint.

The default ‘Normal’ color gamut mode has a higher Delta E since it doesn’t clamp the gamut (2.4 average and 7.25 maximum when compared to sRGB). It’s more accurate when compared to DCI-P3 – 1.33 average and 2.5 maximum.

The ‘Normal’ color gamut mode also has a higher color temperature at 7332K, which adds a noticeable bluish tint to the whitepoint. You can fix this by using the ‘User’ color temperature mode, which has a color temperature of 6333K. The other two color temperature modes are Cool (9192K) and Warm (6253K).

If you wish to use the monitor with a wide color gamut, we recommend using the Display P3 mode. It has the same results as ‘Normal’ with the ‘User’ color temperature preset, but with a slightly more accurate gamma.

You cannot adjust color settings in these modes (sRGB, DCI-P3 and Display P3), but luckily, you don’t need to. More importantly, brightness can be adjusted.

The DCI-P3 mode targets a higher gamma at 2.48 (target is 2.6) with a warmer color temperature at 6156K (target is 6300K), which is intended for viewing movies in a dark environment.

For full calibration, we used the ‘Normal’ color mode and ‘User’ color temperature preset with adjusted color channels: 46 red, 47 green and 48 blue to get a more accurate 6508K whitepoint. The average Delta E is now reduced to 0.47, while the maximum is down to 1.63. Gamma tracking is also improved at a 2.18 average.

You can download our ICC profile here. We used a brightness setting of 39/100 for around 120-nits.

We recommend using the sRGB mode if you want accurate SDR colors in Windows. For extra color vibrancy, use Display P3. Adaptive-Sync, Low input lag and DSC options are disabled by default (at least on our USA-1.0.1 firmware version) and should be enabled. More about these features later in the review.

Moving on, just like all OLED displays, the KTC G27P6S has an infinite contrast ratio as pixels can individually turn off for true blacks. As a result, you get an incredibly immersive viewing experience, especially when viewing the monitor in a dark room.

In the User mode at maximum brightness, the monitor has a peak brightness of 271-nits for a 100% APL (Average Picture Level, or a white window test size) thanks to its MLA+ (Micro Lens Array+) technology, which is a noticeable improvement over the previous-gen W-OLED panels that were limited to between 200-nits and 250-nits, depending on the model.

For smaller APLs, the brightness increases up to 454-nits in SDR mode. Since the brightness of the display dynamically changes depending on how much light content is on the screen, these ABL (Automatic Brightness Limiter) oscillations can be a bit annoying.

ABL is mainly not an issue when watching movies and gaming in SDR. In fact, some gamers might prefer disabling Uniform Brightness to gain a higher brightness in some scenes, but it can be unpleasant for everyday use and office-related tasks.

You can disable ABL by using the Reader mode, which is basically a ‘Uniform Brightness’ mode. This will make the brightness more consistent, but the brightness setting is locked to 80/100.

We also measured the minimum brightness in the User mode, which is exceptional at only 2-nits, allowing for a wide range of adjustments.

A peak brightness of 271-nits for 100% APL might appear low in comparison to that of LED-backlit displays, which usually have a brightness of at least 400-nits in SDR, but it’s more than enough for normal lighting conditions.

The monitor’s W-OLED panel also has a bit heavier matte anti-glare coating that efficiently diffuses reflections, though it makes the image somewhat grainy in comparison to glossy screens. The graininess is mainly noticeable when displaying solid colors, so it’s not an issue for everyday use.

Here’s a look at the display’s brightness and contrast uniformity.

As you can see, it’s an excellent result, however, W-OLED panels have the infamous DSE effect (dirty screen effect) that’s noticeable on solid dark gray patterns.

Next up, the monitor has a screen resolution of 2560×1440, which on its 26.5″ viewable screen results in a decent pixel density of 110.84 PPI (pixels per inch). You get plenty of screen real estate with reasonably sharp details and text, and no necessary scaling.

Moreover, 1440p is significantly less demanding on the GPU than 4K UHD, allowing you to maintain higher frame rates while still offering a fairly sharp image quality.

Now, the KTC G27P6S uses LG’s W-OLED panel with the old RWBG subpixel layout, as opposed to the newer 4K 240Hz and 1440p 480Hz RGWB panels.

This causes minor fringing on small text and fine details. It’s not noticeable in games and videos, but some users who plan on using the monitor to read or type a lot might be bothered by it.

This issue is less noticeable on LG’s RGWB and Samsung’s triangular RGB subpixel layout panels, and even negligible on OLED panels with higher pixel density.

You can try using Better ClearType Tuner or MacType to improve text rendering in some cases, but it doesn’t apply to all applications.

HDR

The KTC G27P6S offers an immersive HDR (High Dynamic Range) viewing experience thanks to its OLED panel with self-emissive pixels that can individually turn off to deliver true blacks.

LED-backlit displays have to use full-array local dimming to achieve this level of black depth, but even with this solution, there are side effects such as visible blooming when small objects are illuminated in darker scenes.

On the other hand, mini LED monitors can get a lot brighter for larger APLs, whereas OLED displays can only achieve high brightness levels for small APLs. In the end, both technologies have their advantages and disadvantages.

OLED displays are generally better when viewing content in a dark or dim-lit room, while mini LED LCDs excel at displaying brighter scenes and can deliver vivid highlights even in well-lit rooms.

Let’s see the HDR accuracy performance of the KTC G27P6S. For HDR testing, we’re using the same Calibrite Display Pro HL colorimeter, this time paired with the HCFR color testing software.

There are two HDR modes: Standard and Cinema.

Both modes are a bit brighter (yellow line) than intended (gray line) with the Standard being a bit more accurate. However, the Cinema mode gets noticeably brighter, up to 1234-nits for 1% APL in comparison to 960-nits of the Standard mode. Therefore, we recommend using the Cinema mode for punchier highlights.

Note that you can change color temperature in HDR mode. The default Normal mode has a too high color temperature, reaching 9000K for 40% white, resulting in a bluish-white. You should switch to either User or Warm preset, both of which are much closer to the 6500K target.

If you have calibrated your monitor in SDR using the ‘User’ mode, those color channel (red, green and blue gain) changes will not translate well in HDR mode. So, in this case, you should use ‘Warm’ for HDR, and your adjusted ‘User’ color temperature settings for SDR.

Luckily, the monitor will save color temperature presets for SDR and HDR separately. It will also automatically enable HDR when compatible content is detected, and disable it once you exit HDR content.

Below is the HDR color saturation test and you can see that, in addition to a more accurate color temperature, switching to the Warm or User mode also provides you with drastically more accurate colors.

If you’re using DisplayPort, make sure that DSC is enabled in the OSD menu since it’s required for 2560×1440 240Hz with native 10-bit color depth for smoother gradients with less banding.

Next, the KTC G27P6S can sustain its high brightness for the expected period of time with it only starting to slowly drop after 2.5 minutes for small APLs.

Here’s how its brightness compares to some of the other HDR displays we’ve tested. Sadly, we weren’t able to measure 1% APL peak brightness for those models, but given their panel technology, their 1% APL should be very close to their 3% APL.

As you can see, the monitor’s peak brightness of >25% APL is notably higher than that of the ASUS PG27AQDM, which uses the older W-OLED panel. The brightness then also jumps for <5% APLs. Sadly, the brightness measurements aren’t as good when it comes to real-scene tests, which we’ll get into at the end of this section.

While the brightness of the KTC G27P6S is higher than that of the MSI MPG 341CQPX on paper, keep in mind that these measures refer to white luminance.

MSI’s model uses a QD-OLED panel with a wider color gamut and a higher color volume. Even though its white luminance is lower, it offers brighter and more saturated colors, which results in a higher perceived brightness.

You can also see just how brighter mini-LED displays can get with the BenQ EX321UX, but again, they have their own drawbacks, such as noticeable blooming, slower response time, etc. The choice between the two technologies comes down to personal preference.

Finally, here are some brightness measurements from real scenes using the Cinema HDR mode, including the ‘Security Services’ sign in ‘Cyberpunk 2077’ (645-nits), the Sun in ‘A Perfect Planet’ at 00:43.603 (317-nits), the lightning at 1:21.111 (649-nits), and the light from the lighthouse from Samsung’s Chasing The Light video at 1:20.175 739-nits) and at 1:19.843 (313-nits).

	The Sun in A ‘Perfect Planet’	Security sign in ‘Cyberpunk 2077’	Lighthouse – small flash from ‘Chasing The Light’	Lighthouse – larger flash from ‘Chasing The Light’
KTC G27P6S	317-nits	645-nits	739-nits	313-nits
ASUS PG27AQDM	515-nits	741-nits	Not measured	Not measured
MSI MPG 341CQPX	520-nits	672-nits	970-nits	Not measured
BenQ EX321UX	792-nits	1231-nits	1140-nits	1440-nits

It appears that the KTC G27P6S is a bit more restrained when it comes to brightness in real scenes, most likely in order to prolong the lifespan of the panel and better burn-in resistance.

Performance

Moving on, the KTC G27P6S has a maximum refresh rate of 240Hz, which ensures buttery-smooth motion clarity and responsive gameplay.

The jump to 240Hz from ~120Hz is not as big as it is going from 60Hz to 120Hz+, but the difference is definitely noticeable!

For pixel response time speed and input lag testing, we’re using OSRTT.

The first thing you should do with this monitor is make sure that the Low Input Lag mode is enabled. Initially, we measured a display latency of 10.47ms at 240Hz, but enabling Low Input Lag reduced that to just 2.39ms, which is an excellent result and makes for no perceptible delay between your actions and the result on the screen.

At a fixed 120Hz and 60Hz refresh rate, we measured 10.3ms and 21.44ms, respectively, which was a bit high. However, once you enable Adaptive-Sync in the OSD menu, the latency is reduced to 6.14ms and 13.82ms, respectively, which is a great result.

Note that you can enable Adaptive-Sync in the OSD menu and disable VRR (variable refresh rate) in your GPU and keep the lower latency benefits in case you don’t want to use VRR.

Next, one of the main advantages of OLED displays is the instantaneous pixel response time speed for zero ghosting behind fast-moving objects, making them ideal for fast-paced games.

Due to the monitor’s instantaneous pixel response time speed, our OSRTT tool is picking up some phantom readings of overshoot at 60Hz, which can be ignored as it’s not present in real use.

Here’s how the monitor’s response times look in Blur Busters’ UFO ghosting test at 240Hz. We’re using the 960 Pixels Per Sec test with the camera’s shutter speed set to 1/4 of the refresh rate with fixed focus, ISO and color temperature.

Below you can see how it compares to some other models:

Moving on, the KTC G27P6S supports variable refresh rate / Adaptive-Sync (AMD FreeSync, NVIDIA G-SYNC Compatible) with a 60-240Hz range.

As expected from an OLED panel, there’s some VRR brightness flickering in certain scenes, such as in-game menus and loading screens of some games, and in games with fluctuating frame rates, usually in darker scenes. The VRR brightness flickering is not as noticeable as it is on VA panels.

You can simply disable VRR in affected games since screen tearing is barely noticeable at 240Hz. Alternatively, you can use V-Sync to prevent tearing.

Besides that, the monitor is flicker-free and there’s a low-blue light filter option available, allowing you to enjoy the screen for long hours without straining your eyes.

Finally, we found no dead or stuck pixels, inversion artifacts or similar issues. However, just like all OLED displays, there’s the risk of permanent image burn-in when displaying bright static elements for too long.

As long as you’re using the monitor sensibly, it shouldn’t be an issue. KTC also offers a few burn-in prevention features, which we’ll get into next.

KTC told us that the monitor’s 3-year warranty covers screen burn-in, but we’d like to see this clearly advertised on the product page as well.

Features

To help prevent burn-in, the KTC G27P6S has a bit higher resolution than 2560×1440 since there’s a Pixel Shift feature that causes the entire image to move by a few pixels every few minutes. Thanks to the higher resolution, the image is never cropped.

This feature cannot be disabled, but it’s not noticeable during everyday use.

Next, the monitor will also automatically dim after no activity has been detected on the screen and there’s a ‘Screensaver’ option in the OSD menu under ‘Advanced Settings’ (off, 5, 10, 20 and 30 minutes options).

Finally, there are OLED Pixel Refresher and OLED Expert options that will ‘refresh’ the pixels to avoid burn-in. By default, these will run automatically, but you can also start them manually (the former takes 4 minutes to complete and can be set to run the next time the display shuts down, while the latter takes 1 minute).

To enter the OSD menu, there’s a directional joystick at the rear of the monitor for quick and easy navigation. The OSD menu also conveniently displays the current resolution and refresh rate, as well as HDR and Adaptive-Sync status.

Besides the standard image adjustment tools (brightness, contrast, color temperature, etc.), the KTC G27P6S also offers some advanced settings, including sharpness, gamma (1.8 to 2.4), hue/saturation, automatic input detection and HDMI color range.

Gaming features include Black Stabilize (improves visibility in dark scenes by altering the gamma curve), on-screen timers, crosshair overlays, a refresh rate tracker and a 24.5″ mode, which puts black bars around the image to simulate a 24.5″ display.

You can use HDR and VRR in the 24.5″ mode and we measured low display latency of 2.73ms at 240Hz.

The OSD joystick can also be used for shortcuts to certain functions by moving it up (input selection), left (gaming features), down (brightness) and right (KVM). You can assign several different functions to these shortcuts, including contrast, volume, mute, presets, HDR, RGB lighting and aspect ratio.

Other settings include OSD menu adjustments (language, position, timeout, transparency), audio, information (shows firmware version), USB sleep power, DSC, DP version and DDC/CI on/off.

While there’s no official software to make OSD-related adjustments in a desktop application, the G27P6S supports DDC/CI and you can use third-party tools, such as ControlMyMonitor to make the following adjustments:

Design & Connectivity

The stand of the monitor is fairly sturdy and offers full ergonomic support, including up to 110mm height adjustment, +/- 15° swivel, +/- 90° pivot, -5°/20° tilt and 75x75mm VESA mount compatibility.

The bezels are ultra-thin on all four sides of the monitor at just around 1mm with a ~5mm black border before the image starts. We also like that there’s no chin protruding on the bottom bezel like on some other displays using the same panel.

There’s a small LED power indicator, which can be disabled, and there’s a KTC logo with customizable RGB lighting at the back of the monitor.

As previously mentioned, the monitor uses a bit heavier matte anti-glare coating that’s excellent at diffusing reflections but adds some graininess to the image, which is mainly noticeable when displaying solid colors.

A glossy screen would provide a more vivid image quality, but it’s also more reflective, meaning that you’d have to be very careful with lighting in your room. In the end, it comes down to personal preference.

The monitor has passive cooling via a heatsink, so there’s no audible fan. Further, the design includes a cable management bracket and a removable cover for inputs.

Connectivity options are abundant and include DisplayPort 1.4, two HDMI 2.1* ports, a USB-C port with DisplayPort Alternate Mode and 65W Power Delivery, a headphone jack and a dual-USB 3.0 hub (1 upstream + 2 downstream).

While KTC advertizes HDMI 2.0 on some product pages, 2560×1440 is supported at 240Hz with 10-bit color depth, which requires a higher bandwidth than HDMI 2.0. We weren’t able to test if HDMI 2.1 VRR is supported though.

4K 120Hz upscaling is not supported, which means that if you have the Xbox Series X/S console, you’ll have to choose between 1440p 120Hz SDR and 4K 60Hz HDR.

The monitor also has dual 5W built-in speakers with decent audio quality and integrated KVM functionality, which allows you to connect your keyboard and mouse to the monitor and swap control of two PCs connected to the monitor (one connected via USB-C, the other via DP/HDMI + USB-B to USB-A).

In the box, along with the monitor and its stand, you’ll get a calibration report, a quick start guide, a user guide, a power brick, VESA mounting adapters and the following cables: DisplayPort, HDMI, USB-C and power cord. If you want to use the KVM function, you’ll need to get a USB-A to USB-B cable separately.

Price & Similar Monitors

The KTC G27P6S goes for $700 and it’s available with a $100 off coupon on Amazon, which puts it in the same ballpark as the competing models, such as the LG 27GS93QE with a weaker 2-year burn-in warranty and no KVM or USB-C.

There’s also the ASUS XG27AQDMG with a higher real scene HDR brightness, a glossy screen surface and a 3-year burn-in warranty for $580 – $750.

Another affordable OLED display is the AOC AG276QZD2 with a QD-OLED panel and a 3-year burn-in warranty for $500 – $600, though it has a bit undersaturated HDR colors and no USB-C or KVM.

We recommend checking out the Gigabyte FO27Q2 with a 1440p 240Hz QD-OLED panel for a higher perceived brightness, better text clarity, a 3-year burn-in warranty. It also has a built-in KVM and USB-C (though with a low 18W Power Delivery).

	LG 27GS95QE / 27GS93QE*	KTC G27P6S	ASUS XG27AQDMG	Gigabyte FO27Q2	MSI 271QPX E2	AOC AG276QZD2
Panel	W-OLED MLA+	W-OLED MLA+	W-OLED MLA+	QD-OLED	QD-OLED	QD-OLED
100% APL Brightness	275-nits	275-nits	275-nits	250-nits	250-nits	250-nits
10% APL Brightness	750-nits	750-nits	750-nits	450-nits	450-nits	450-nits
≤ 3% APL Brightness	1300-nits	1300-nits	1300-nits	1000-nits	1000-nits	1000-nits
DCI-P3 Color Gamut	98.5%	98.5%	98.5%	99.3%	99.3%	99.3%
USA Burn-in Warranty	2-year	3-year	3-year	3-year	3-year	3-year
Display Inputs	DP 1.4, 2x HDMI 2.1	DP 1.4, 2x HDMI 2.0	DP 1.4, 2x HDMI 2.0	DP 1.4, 2x HDMI 2.1	DP 1.4, 2x HDMI 2.1	2x DP 1.4, 2x HDMI 2.0
Other Ports	2x USB-A 1x USB-B	2x USB-A 1x USB-B	2x USB-A 1x USB-B	2x USB-A 1x USB-B	–	2x USB-A 1x USB-B
USB-C (DP Alt Mode + Power Delivery)	No	Yes (65W)	No	Yes (18W)	Yes (15W)	No
KVM	No	Yes	No	Yes	No	No
Audio Ports	Headphone Jack, Optical Digital Audio Out	Headphone Jack, 2x5W Speakers	Headphone Jack	Headphone Jack, 2x5W Speakers	Headphone Jack	Headphone Jack
Other	Hardware Calibration	–	ELMB	–	–	–
Screen Surface	Matte	Matte	Glossy	Glossy	Glossy	Glossy

Also, note that MSI’s 1440p 360Hz QD-OLED model, the MAG 271QPX, can sometimes be found on sale for $600.

For more information and the best HDR monitor deals, check out our dedicated best HDR monitors buyer’s guide for the best OLED and mini LED models.

Conclusion

Overall, the KTC G27P6S is an excellent gaming monitor that delivers an immersive HDR viewing experience and smooth performance thanks to its OLED panel.

It’s a bit constrained in real scene HDR brightness, most likely in order to preserve panel longevity and help prevent burn-in, which in addition to its plethora of OLED care features might encourage users concerned with burn-in to go with this model.

KTC told us that the monitor’s 3-year warranty includes burn-in coverage, but we’d still like to see burn-in warranty clearly advertised by KTC on the monitor’s product pages.

We especially like the 4-side bezel-less design without a protruding chin as seen on some other models, as well as the excellent factory calibration and the amount of available image customization, which is a weak spot of some other models, such as the AOC AG276QZD2.

Finally, there’s stiff competition when it comes to 27″ 1440p high refresh rate OLED models, so make sure you take other alternatives into account as well, but thanks to its many useful features (decent integrated speakers, KVM and USB-C with 65W PD), we feel that the KTC G27P6S is a strong contender.

Specifications

Screen Size	27-inch
Resolution	2560×1440 (WQHD)
Panel Type	OLED
Aspect Ratio	16:9 (Widescreen)
Refresh Rate	240Hz
Response Time	0.03ms (GtG)
Speakers	2x5W
Adaptive-Sync	60-240Hz
Ports	DisplayPort 1.4, 2x HDMI 2.0*, USB-C (DP Alt Mode, 65W PD)
Other Ports	Headphone Jack, 2x USB-A 3.0, USB-B 3.0
Brightness (1 – 3% White Window)	1234 cd/m²
Brightness (10% White Window)	770 cd/m²
Brightness (100% White Window)	271 cd/m²
Contrast Ratio	Infinite
Colors	1.07 billion (true 10-bit) 99% DCI-P3 Specified 94.4% DCI-P3 Measured
HDR	VESA DisplayHDR 400 True Black
VESA	Yes (75x75mm)