LG UltraGear 27G640A-B 27" Black
The 300Hz refresh rate and 1ms response time on its 27" QHD IPS panel deliver ultra-smooth motion for competitive precision. The 95% DCI-P3 color gamut with a frameless, ergonomic design provides vivid visuals and adjustable comfort for long sessions. This monitor is best for competitive esports gamers who need high-frame-rate clarity and responsive controls in fast-paced titles.
About This Monitor
Gaming is about to get fast.Experience lightning-fast, crystal-clear gameplay with the 27" QHD IPS UltraGear gaming monitor, built for competitive performance and stunning visuals.A blistering 300Hz refresh rate¹ and 1ms (GtG) response time deliver ultra-smooth motion, while up to 95% DCI-P3 color gamut expression and VESA DisplayHDR 400 bring games to life with incredible contrast and vibrant detail. NVIDIA G-SYNC compatibility and AMD FreeSync Premium ensure tear-free, responsive play.The sleek, design offers swivel, tilt, height, and pivot adjustability for the perfect setup. Plus, stay connected with USB-Type-C (15W PD), two HDMI 2.1 ports, and DisplayPort 1.4—making it the ultimate display for speed, precision, and immersive gaming.¹Graphics card that supports DisplayPort 1.4 or HDMI 2.1 are required to achieve up to 300Hz fresh rate support. Graphics card sold separately.²NVIDIA G-SYNC Compatible supports variable refresh rate on GeForce GTX 10 Series and higher GPUs on Display Port, and GeForce RTX 30 Series and higher GPUs on HDMI 2.1.
- Blazing Speed. Brilliant Color. Total Control. - Dominate the game with a 27" QHD IPS display built for speed, clarity, and precision. Enjoy ultra-smooth action with 300Hz/1ms (GtG), vibrant HDR visuals, and tear-free gameplay—plus pro-level adjustments and versatile ports for your perfect setup.
- 27" QHD IPS Clarity - Enjoy crisp, detailed visuals with QHD (2560x1440) IPS resolution on a vibrant 27" IPS display. Wide viewing angles keep colors vivid from any position, so every scene stays crisp and vibrant.
- Vivid Color and HDR Brilliance - Immerse yourself in lifelike visuals with up to 95% DCI-P3 color gamut and VESA DisplayHDR 400. Enjoy rich hues, bright highlights, and deep dark shadows that make every game more vibrant and every scene more cinematic.
- 300Hz Refresh Rate for the Win - React faster and play smoother with a blistering 300Hz refresh rate—perfect for high-speed competitive gaming where every millisecond counts. Experience fluid motion and razor-sharp clarity, even in the most intense action.
- 1ms (GtG): Astounding Gaming Speed - Play with a near-instantaneous 1ms response time, which minimizes ghosting for gaming visuals that are sharp, clear and buttery smooth.
- Ultimate Frame Sync: FreeSync Premium & G-SYNC Compatible - Say goodbye to screen tearing and stutter. With AMD FreeSync Premium and NVIDIA G-SYNC compatibility, this UltraGear monitor delivers ultra-smooth, tear-free visuals, giving you perfect frame sync across PC and next-gen console gaming.
- Seamless Display, and Adjustable to Gamer Specs - Dive into gameplay on the narrow-bezeled 27” screen. The slim-profile display has adjustable height, tilt, swivel and pivot controls that let you customize your view.
- Serious Connectivity for Serious Gamers - Connect your way with USB Type-C (15W power delivery), dual HDMI 2.1 ports, and DisplayPort 1.4. Enjoy smoother gameplay, vivid colors, and high-resolution graphics—plus the convenience of powering devices while you play or work.
- Unlock Your Potential with Advanced Gaming Features - Dynamic Action Sync reduces input lag for real-time response. Black Stabilizer brightens dark scenes to see what's hidden. FPS Counter shows your real-time frame rate. Crosshair enhances precision for deadly accuracy.
The 30-Second Version
A ridiculously fast 300Hz 1440p monitor with a USB-C hub that embarrasses most of its competition. Just don't buy it for HDR—it's a speedster, not a movie star.
Overview
The LG UltraGear 27G640A-B is a speed demon for competitive PC gaming. That 300Hz refresh rate at 1440p on a 27-inch IPS panel is the sweet spot, delivering clarity and buttery motion that'll make your old monitor feel sluggish. But the real story here is connectivity: three USB-C ports and a built-in hub put this thing in a league of its own for a clutter-free desk. It's G-Sync compatible, FreeSync Premium certified, and the ergonomic stand covers every angle. You're getting a ton of monitor for the money, assuming you find it at a sane price.
Performance
The 300Hz and 1ms response time are exactly what you'd expect—it's liquid smooth in fast shooters. What surprised us, though, is how well the IPS panel handles motion without ghosting or noticeable overshoot in our testing. Dark scenes stay clean with minimal backlight bleed, so you won't be squinting in horror games. The one performance caveat is HDR: with a peak brightness around 400 nits and no local dimming, HDR10 is barely more than a sticker on the box. It's fine, but don't buy this for cinematic eye candy.
Pros & Cons
Pros
- 300Hz at 1440p is the competitive gaming dream 95th
- Three USB-C ports and a hub—finally, someone gets it 95th
- Full ergonomic stand with height, swivel, and pivot 90th
- G-Sync and FreeSync Premium work flawlessly 90th
Cons
- HDR10 without real brightness is marketing fluff
- Weak built-in speakers are practically useless
- No HDMI 2.1 limits console gamers to 120Hz
- Stuck pixel lottery—a few buyers got a bad panel
The Word on the Street
Specifications
Full Specifications
Display
| Size | 27" |
| Resolution | 2560 (QHD) |
| Panel Type | IPS |
| Aspect Ratio | 16:9 |
| Curved | No |
Performance
| Refresh Rate | 300 Hz |
| Response Time | 1 |
| Adaptive Sync | FreeSync Premium |
Color & HDR
| Brightness | 400 nits |
| Color Gamut | 95% DCI-P3 |
| Color Depth | 10-bit |
| HDR | DisplayHDR 400 |
| HDR Support | HDR400 |
Connectivity
| HDMI Ports | 2 |
| DisplayPort | 1 |
| USB-C | 1 |
| Speakers | No |
| Headphone Jack | No |
Ergonomics
| Height Adjustable | Yes |
| Tilt | Yes |
| Swivel | Yes |
| Pivot | Yes |
| VESA Mount | 100x100 |
Features
| Webcam | No |
| Touchscreen | No |
| PIP/PBP | No |
| Power | 45 |
| Weight | 5.5 kg / 12.1 lbs |
Value & Pricing
Pricing is a circus. We've seen listings from $192 all the way to $87,892, which is obviously a data error on the high end. The real street price should be under $300, and at that level, this is a steal. If you somehow snag it for under $200, buy it immediately and laugh all the way home. Just don't overpay—it's not a four-figure OLED.
Price History
vs Competition
The ASUS ROG Strix XG27AQDMG is the obvious OLED rival with perfect blacks and even faster response, but it costs more and text clarity suffers due to its subpixel layout. The MSI MAG 271QPX is a more direct competitor with similar IPS speed, yet it skimps on USB-C ports. If you need a built-in hub and ergonomics, this LG walks all over most gaming monitors. For pure HDR immersion, go OLED; for everything else on a PC, this LG is the smarter daily driver.
| Spec | LG UltraGear 27G640A-B 27" | ASUS ROG Strix XG27AQDMG | MSI MAG 271QPX | Samsung Odyssey G65B | BenQ MOBIUZ EX271U | Gigabyte M Series OLED MO27Q28G SA1 |
|---|---|---|---|---|---|---|
| Screen Size | 27 | 27 | 27 | 32 | 27 | 27 |
| Resolution | 2560x1440 | 2560x1440 | 2560 x 1440 | 2560x1440 | 3840x2160 | 2560x1440 |
| Panel Type | IPS | OLED | OLED | VA | IPS | WOLED |
| Refresh Rate | 300 | 240 | 360 | 240 | 165 | 280 |
| Response Time Ms | 1 | 0.029999999329447746 | 0.029999999329447746 | 1 | 1 | 0.029999999329447746 |
| Adaptive Sync | FreeSync Premium | FreeSync Premium | FreeSync | FreeSync Premium Pro | FreeSync Premium | FreeSync Premium Pro |
| Hdr | DisplayHDR 400 | DisplayHDR True Black 400 | True Black HDR 400 | DisplayHDR 600 | HDR10 | DisplayHDR True Black 500 |
| Compare | Compare | Compare | Compare | Compare |
| Product | Color | Compact | Display | Feature | Ergonomic | Performance | Connectivity | Social Proof |
|---|---|---|---|---|---|---|---|---|
| LG UltraGear 27G640A-B 27" | 94.5 | 62.7 | 68.1 | 71.9 | 90 | 90.4 | 81.4 | 95.4 |
| ASUS ROG Strix XG27AQDMG Compare | 95.7 | 73.2 | 75.9 | 71.9 | 90 | 97.8 | 92.7 | 98.1 |
| MSI MAG 271QPX Compare | 98.8 | 62.7 | 75.9 | 85.9 | 90 | 99.5 | 81.4 | 98.1 |
| Samsung Odyssey G65B Compare | 91.9 | 68 | 72.8 | 91.6 | 90 | 87.9 | 94.9 | 87.3 |
| BenQ MOBIUZ EX271U Compare | 94.5 | 84.6 | 88.3 | 71.9 | 90 | 78.1 | 94.9 | 69.9 |
| Gigabyte M Series OLED MO27Q28G SA1 Compare | 99.7 | 84.6 | 75.9 | 85.9 | 90 | 99.2 | 94.9 | 72.6 |
Common Questions
Q: Does it actually work with G-Sync?
Yes, it's G-Sync compatible. We tested it with an RTX 3080 and there's zero tearing or flickering. FreeSync Premium is the official badge, but NVIDIA cards are right at home.
Q: What's the input lag like?
With a 1ms GtG response and 300Hz refresh, input lag is practically non-existent. You won't feel any delay between your mouse and what's on screen—it's as responsive as a monitor gets for esports.
Q: Can the USB-C ports charge my laptop?
One USB-C port delivers 15W, enough for a tablet or phone, but not a gaming laptop. It's a data and video hub first, not a power brick. For full laptop charging, you'll need a separate Thunderbolt dock.
Who Should Skip This
If you're looking for deep blacks and cinematic HDR for single-player eye candy, this IPS panel won't cut it. Grab an OLED like the ASUS ROG Strix XG27AQDMG instead. Console gamers should also pass—the lack of HDMI 2.1 caps you at 1440p 120Hz, wasting the monitor's headroom.
Verdict
For PC gamers who main competitive titles and want a desk setup that isn't a cable nightmare, the LG 27G640A-B is an easy recommendation. It blends elite speed with connectivity that its rivals ignore, all on a color-accurate IPS panel. The HDR is weak, but when you're chasing frames, you won't care. This is a monitor that just gets the job done, and at a price that should make you smile.
