If you want better USB-C power delivery
Choose TCL 32R84. It scores 4.3 vs 1.0 for USB-C power delivery, with a 4.2 overall score.
LG 27GX790B-B Monitor Review
Bottom Line
A superb 540Hz OLED for serious competitive gaming, with remarkably clear motion and vivid HDR. The 720Hz mode blurs the image at 720p, while matte-screen quirks and high hardware demands limit its appeal.
Dedicated competitive PC gamers who play high-frame-rate shooters and want the clearest possible fast motion without giving up vibrant OLED contrast.
Casual or budget-focused players, 4K-first single-player fans, and people needing flawless long-session text clarity or laptop charging through a single cable.
Verdict
The LG 27GX790B-B is built for competitive PC gaming where speed matters more than pixel count. At its native 1440p resolution, the 540Hz Tandem OLED panel combines unusually sharp motion, low input lag, deep blacks, and bright HDR highlights. Reviewers also appreciate the adjustable stand, extensive picture controls, and modern connections. The main compromise is the headline 720Hz Dual Mode: dropping to 720p makes images conspicuously softer, and even powerful PCs struggle to feed the display enough frames. The matte coating helps with reflections but some testers prefer the clarity of glossy competitors; one unit also showed distracting gray-screen texture. Office-text comfort and long-term burn-in confidence are less consistent. At a steep discount it can be compelling value for esports enthusiasts; casual gamers and buyers prioritizing 4K sharpness have better-fitting alternatives.
Feature Scorecards
Summary
62 reviewed features-
Very positive 4.5-5.028 (45%)
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Positive 3.5-4.417 (27%)
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Neutral 2.5-3.411 (18%)
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Negative 1.5-2.45 (8%)
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Very negative below 1.51 (2%)
Pros highlights
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Serious esports players get exceptionally clear motion and responsive control, especially in lightweight shooters that can run at hundreds of frames per second.
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Native 540Hz QHD feels extraordinarily fluid and crisp. The 720Hz option is less universally useful because it drops to 720p and demands extremely high frame rates.
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Fast-moving objects show remarkably little blur or trailing, helping target visibility and making rapid camera movement feel precise.
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The wide color gamut gives games vivid, rich color; color purity is a frequent highlight of the newer Tandem OLED panel.
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A standout specialist for high-frame-rate PC gaming rather than a universally ideal monitor; image compromises and value depend heavily on how you play.
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Excellent OLED contrast keeps dark areas black while bright highlights pop, especially in atmospheric games.
Cons highlights
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Switching between 540Hz QHD and 720Hz HD creates choice, but several testers found the softer 720p image too costly for the modest speed benefit.
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Even expensive gaming systems often fall well short of 540–720 fps in modern games, restricting the benefit of the highest modes.
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Native 1440p looks good at 27 inches, but enabling 720Hz reduces the image to a very soft 720p; detail-focused buyers may want 4K.
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At a steep discount, its 540Hz OLED performance compares favorably with pricier rivals; at full price, many gamers can spend far less without giving up much.
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The matte coating cuts reflections but looks less crisp and punchy than glossy rivals to some viewers; preferences are sharply divided.
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Some testers miss an opening through the stand, although one found the included rear clip effective for bundling cables.
Use Cases
Best for
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Fast gaming can still look rich and high-contrast, combining bright HDR effects with responsive OLED motion.
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Clean styling and an adjustable stand help the monitor work at a desk by day and in games by night, although text rendering impressions differ.
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A dim room gives the deep OLED blacks room to shine without fighting strong reflections.
Not ideal for
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Casual gamingThe panel looks good for ordinary play, but its costly extreme refresh rates are largely wasted without competitive goals and high frame rates.
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Single-cable laptop dockingUSB-C can carry laptop video, but its 5W power delivery is too weak to serve as a useful charging dock.
Compared With Category Average
Compared with other Monitors, this product is above average in Headphone output quality, competitive gaming suitability, ghosting control, near average in color gamut, USB hub functionality, below average in USB-C power delivery, Integrated power supply, warranty and support service.
Comparison summary
59 compared features-
Above average 0.4+ pts higher25 (42%)
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Same as average within 0.3 pts15 (25%)
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Below average 0.4+ pts lower19 (32%)
Largest category differences
| Attribute | This product | Category average | Difference |
|---|---|---|---|
| USB-C power delivery | 1.0 | 3.8 | -2.8 |
| Headphone output quality | 5.0 | 2.6 | +2.4 |
| Integrated power supply | 2.0 | 4.1 | -2.1 |
| warranty and support service | 2.0 | 3.8 | -1.8 |
| Resolution | 2.6 | 4.3 | -1.7 |
| competitive gaming suitability | 4.9 | 3.4 | +1.4 |
| USB port accessibility | 3.0 | 4.6 | -1.6 |
| Screen coating clarity | 2.5 | 3.8 | -1.3 |
Consider This Instead
If you want better warranty and support service
Choose Dell Alienware AW2725DF. It scores 4.8 vs 2.0 for warranty and support service, with a 4.2 overall score.
If you want better Integrated power supply
Choose ASUS ROG Strix OLED XG27ACDNG. It scores 4.8 vs 2.0 for Integrated power supply, with a 4.4 overall score.
If you want better cable management
Choose HyperX OMEN OLED 27q. It scores 5.0 vs 2.8 for cable management, with a 4.1 overall score.
Compared in Reviews
Products reviewers directly compared with this model, grouped into quick takeaways.
- Worse: Maximum refresh rates LG has a higher refresh rate than this QD-OLED reference.
- Compared: Brightness and speed versus color accuracy LG leads in refresh and brightness; Alienware has punchier colors and better accuracy.
- Alternative: Ultrawide immersion The Alienware offers a very different ultrawide experience at a similar list price.
FAQ
What refresh rates does it support?
It runs up to 540Hz at its native 2560×1440 resolution, or up to 720Hz at 1280×720 in Dual Mode.
Is 720Hz worth using?
Usually only for extremely competitive play. Several reviewers found 720p too blurry to justify the increase over already-fast 540Hz QHD.
Does it need a very powerful PC?
Yes, if you want to approach its highest frame-rate modes. Even high-end test systems struggled to reach 540fps in demanding games.
How good is the HDR picture?
Deep OLED blacks and unusually bright highlights make HDR attractive, though overbrightening and the matte finish can compromise accuracy or visual punch.
Is it good for work and reading text?
Results are mixed: some found desktop text crisp and comfortable, while others noticed fringing or texture. Static-image use also raises OLED burn-in considerations.
Is the screen glossy or matte?
It has a matte anti-glare coating. That helps with reflections but looks less clear or vivid than glossy OLEDs to some reviewers.
Does it work well with consoles?
It has HDMI 2.1 connections, and one reviewer enjoyed smooth PS5 Pro gaming. Its ultra-high refresh capabilities are chiefly beneficial to gaming PCs.
Sample Expert Reviews We Analyzed
These are a few of the reviews included in our analysis.
Video Reviews
YouTube - RTINGS Computer
YouTube - Full Transparency
- Review score
- 3.9
Article Reviews
itechguides.com
The LG 27GX790B-B pairs 1440p at 540Hz with a 720p/720Hz mode. See its gaming strengths, OLED drawbacks, and who should consider it.
- Review score
- 3.1
t3.com
This OLED monitor is a true stunner
- Review score
- 4.5
cryovex.com
Read our LG UltraGear GX7 27GX790B gaming monitor review to see if this 540Hz QHD/720Hz FHD Dual-Mode OLED gaming monitor is worth buying!
- Review score
- 4.5
tomsguide.com
The LG UltraGear 27GX79B-B impresses with its high refresh rates. While it’s fast and offers high HDR brightness, it’s only for competitive...
- Review score
- 4.2
tomsguide.com
Are insanely high refresh rates for gaming monitors worth it? We asked experts if they provide real benefits for gamers or if it's just...
- Review score
- 3.2
Top Monitors to Consider
This 360Hz QD-OLED ultrawide delivers exceptional gaming motion, vibrant HDR and dramatically cleaner text. Its high price, less-than-perfect bright-room blacks and occasional HDR dimming are the main reasons to hesitate.
Pros: color gamut, contrast
Cons: value for money, Resolution
Lightning-fast 360Hz OLED gaming, rich color and an unusually flexible USB-C/KVM setup are the big draws. Strong room lighting, limited full-screen HDR brightness and static-content burn-in concerns keep it from...
Pros: color gamut, overall satisfaction
Cons: reflection handling, VRR flicker
The 27-inch 4K OLED picture is exceptionally crisp and responsive, with useful USB-C and KVM extras. Its high price, oversized stand, and bright-room compromises limit its appeal.
Pros: sharpness, overall satisfaction
Cons: value for money, VRR flicker
Best for exceptional 4K HDR, accurate color, fast 240Hz gaming, and strong work connectivity. Skip it if you need built-in speakers, ultrawide immersion, television-level HDR brightness, or a budget-friendly upgrade.
Pros: brightness, reflection handling
Cons: cable management