LG UltraGear 27GX704A Review: Is This Gaming Monitor Worth It?

The LG UltraGear 27GX704A is worth buying if you want a sharp 27-inch 4K OLED with 240Hz motion, but its premium price, OLED burn-in precautions, and demanding PC hardware make it a specialist choice rather than the best monitor for everyone.

LG UltraGear 27GX704A specifications at a glance

Model suffixes and regional bundles can change the included cables or stand details, so check the listing for the exact 27GX704A variant before buying. The important combination is the same: 4K resolution, OLED contrast and a 240Hz refresh rate.

Image quality: the main reason to buy it

The 27GX704A’s OLED panel is its strongest feature. Each pixel produces its own light, so a black pixel can switch off completely. In a dark game such as a horror title or a space exploration game, this produces a much more convincing image than a conventional IPS monitor with a backlight. There is no gray glow around bright objects on a black background, and viewing angles are excellent.

At 27 inches, 4K gives a pixel density of roughly 163 pixels per inch. That is substantially sharper than a 27-inch 1440p monitor, which is around 109 pixels per inch. Fine foliage, distant geometry and small interface text look cleaner, although Windows scaling at 125% or 150% may be more comfortable than running the desktop at 100%.

OLED also avoids the slow dark-level transitions that can create smearing on some VA displays. Fast camera pans remain clear, and the panel does not need an aggressive overdrive setting that can introduce bright inverse trails.

Where the image is less perfect

OLED screens can show a subtle grain or matte texture depending on the panel surface and lighting. Bright full-screen scenes may also appear less intense than on a Mini-LED monitor because OLED limits its overall brightness to control heat and power. In a dark room, its contrast looks outstanding; in a bright room, a high-brightness LCD can sometimes look more forceful.

As with many OLED monitors, very fine text may show slight color fringing because of the pixel layout. Most games look excellent, but people who spend all day reading spreadsheets or editing documents may prefer a sharp IPS display.

240Hz refresh rate: impressive, but hardware-hungry

A 240Hz refresh rate reduces the interval between frames to about 4.17 milliseconds. A 144Hz monitor displays a new frame every 6.94ms, while a 60Hz monitor takes 16.67ms. The difference is most noticeable in competitive shooters, racing games and rhythm games, where camera movement and target tracking benefit from lower persistence.

However, 4K at 240Hz is a serious workload. An uncompressed 3840 × 2160 signal at 240Hz contains:

3840 × 2160 × 240 = 1,990,656,000 pixels per second.

Using 10-bit RGB, the raw video data is approximately:

1.99 billion × 30 bits = 59.7Gbps

That figure excludes blanking and protocol overhead. With timing overhead, the requirement is close to or above 70Gbps, which is beyond ordinary DisplayPort 1.4 without Display Stream Compression. The 27GX704A therefore relies on modern high-bandwidth connections and/or DSC for its top modes. Use a certified cable and enable the full refresh rate in Windows or your GPU control panel rather than assuming the monitor will select it automatically.

For a high-end gaming PC, the sensible target is not necessarily 240 frames per second in every modern game. A current high-performance graphics card may reach 200–240fps in competitive games at 4K with tuned settings, while demanding ray-traced releases may sit between 80 and 160fps. Variable refresh rate makes those lower figures feel smooth, but the monitor still gives you useful headroom for less demanding titles.

Response time and gaming performance

The advertised 0.03ms response-time figure describes pixel switching under specific test conditions, not the complete delay between moving a mouse and seeing the result. Even so, OLED technology is inherently fast, and the 27GX704A should provide much cleaner motion than a typical 4K 144Hz IPS or VA monitor.

For competitive gaming, set the monitor to its highest refresh rate, enable adaptive sync, and use an in-game frame cap slightly below the refresh ceiling. At 240Hz, a cap around 237fps is a practical starting point. This leaves a small amount of headroom for the variable-refresh system and can prevent the GPU from repeatedly hitting the ceiling.

For games that cannot maintain high frame rates, keep VRR enabled. A stable 100–160fps range at 4K often looks better than an uncapped frame rate that jumps constantly between 90 and 200fps.

Recommended starting settings

• Competitive games: 240Hz, VRR enabled, 237fps cap, low latency mode enabled if available, and reduced shadow or ray-tracing settings.
• Single-player games: 4K, HDR enabled, VRR enabled, and a frame cap matched to your typical performance, such as 117fps for a 120Hz-style target or 160–200fps for lighter games.
• Console gaming: use HDMI 2.1, enable 4K/120Hz and VRR on the console, and leave 240Hz as a PC-focused feature.
• Desktop work: use an appropriate scaling level, activate the panel’s pixel-care features, and avoid leaving a static taskbar or application window visible for many hours.

HDR: excellent blacks, moderate peak brightness

HDR is convincing in dark scenes because OLED can place bright highlights directly beside genuinely black areas. Stars, headlights and muzzle flashes have strong contrast, with no LCD backlight bleeding into nearby shadows.

The limitation is sustained brightness. A True Black 400-class OLED monitor is not designed to compete with a bright Mini-LED screen that can produce much higher full-screen and small-window highlights. HDR games with large snowy landscapes or bright skies may look less dazzling than they do on a high-brightness LCD.

Use HDR when the game has a proper HDR implementation and the room is not flooded with direct sunlight. For ordinary desktop work, SDR is usually more comfortable and avoids unnecessary brightness changes. Calibrate the operating system’s HDR brightness controls rather than simply selecting the brightest preset.

Burn-in precautions and daily use

OLED burn-in is the principal ownership concern. It is not an automatic failure, but repeated static elements such as a game HUD, news ticker or application toolbar can cause uneven wear over a long period. The 27GX704A’s panel-care functions are important rather than optional.

• Allow the monitor to complete its short compensation or pixel-cleaning cycle when prompted.
• Set the screen to turn off after a few minutes of inactivity instead of displaying a static screensaver.
• Use automatic taskbar hiding if the monitor is also a work display.
• Vary games and applications instead of displaying one fixed interface every day.
• Do not unplug the monitor immediately after use if it needs standby power for its maintenance cycle.

These steps do not eliminate risk, but they make OLED ownership much more sensible for mixed gaming and desktop use.

Is the LG UltraGear 27GX704A good value?

The value depends on whether you will use both of its expensive features: 4K and 240Hz. If you mostly play cinematic games at 60–100fps, a 4K 144Hz OLED or a less expensive 4K IPS monitor may deliver nearly the same experience for less money. If you play competitive games and have a graphics card capable of high frame rates, the 27GX704A combines sharpness and speed in a way that few conventional monitors can match.

Final verdict

The LG UltraGear 27GX704A is a premium gaming monitor with a clear purpose: deliver 27-inch 4K sharpness without giving up OLED contrast or 240Hz motion. Its image quality, near-instant response and VRR support make it excellent for fast PC gaming, while HDR looks especially good in dark scenes.

It is not the universal choice. The high refresh rate demands powerful hardware, peak HDR brightness is limited compared with the best Mini-LED displays, and OLED care requires sensible habits. At a general market price around the premium 4K OLED range—often roughly $700–$1,000 depending on promotions and region—it becomes compelling when discounted. Buy it if you can drive high frame rates and value contrast; choose a cheaper 4K 144Hz display if you cannot.