LG 27GX790A-B vs 27GX790B-B: Which Monitor Is Better?

Tested using Methodology v2.1.1

Updated Feb 20, 2026 06:03 PM

This review is in Early access

Max Refresh Rate 480 Hz

Size 27"

Panel Type OLED

Native Resolution 2560 x 1440

Max Refresh Rate Lock Hz

Size Lock"

Panel Type Locked

Native Resolution Locked

Recommended in 1 article:
High Refresh Rate

Our Verdict

LG 27GX790A-B

LG 27GX790B-B

Full comparison details regarding individual product score sets can be found in the section below

Variants

27GX790A-B (27")

27GX790B-B (27")

Review

See LG 27GX790A-B Review

See LG 27GX790B-B Review

Check Price

27"

27GX790A-B

27"

27GX790B-B

27"

27GX790A-B

27"

27GX790B-B

27"

27GX790A-B

27"

27GX790B-B

27"

27GX790A-B

27"

27GX790B-B

27"

27GX790A-B

27"

27GX790B-B

Main Differences for

PC Gaming

Threshold

0.10

PC Gaming

9.2

0.0

No major differences between these monitors for pc gaming. See full list of tests below.

Full Comparison

PC Gaming

9.2

0.0

Console Gaming

9.0

0.0

Office

7.1

0.0

Editing

8.6

0.0

Brightness

6.7

0.0

Response Time

9.9

0.0

HDR Picture

8.9

0.0

SDR Picture

9.9

0.0

Color Accuracy

8.4

0.0

Design

Style

Design Picture

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Curved

Locked

Curve Radius

Not Curved

Locked

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Build Quality

8.5

N/A

Build Quality Picture

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Ergonomics

8.2

N/A

Ergonomics Picture

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Back Picture

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Height Adjustment

4.9" (12.5 cm)

Lock" (Lock cm)

Min Height To Top Of Panel

17.9" (45.5 cm)

Lock" (Lock cm)

Tilt Range

-5° to 12.5°

Locked

Rotate Portrait/Landscape

Yes, Clockwise

Locked

Swivel Range

-25° to 25°

Locked

Wall Mount

VESA 100x100

Locked

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Stand

Stand Picture

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Thickness Picture

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Base Width

12.1" (30.7 cm)

Lock" (Lock cm)

Base Depth

9.8" (25.0 cm)

Lock" (Lock cm)

Thickness (With Display)

7.0" (17.7 cm)

Lock" (Lock cm)

Weight (With Display)

20.3 lbs (9.2 kg)

Lock lbs (Lock kg)

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Display

Display Picture

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Size

27"

Lock"

Housing Width

23.9" (60.6 cm)

Lock" (Lock cm)

Housing Height

14.1" (35.9 cm)

Lock" (Lock cm)

Thickness (Without Stand)

1.8" (4.6 cm)

Lock" (Lock cm)

Weight (Without Stand)

11.3 lbs (5.1 kg)

Lock lbs (Lock kg)

Borders Size (Bezels)

0.3" (0.8 cm)

Lock" (Lock cm)

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Controls

Controls Picture

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In The Box

In The Box Picture

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Power Supply

External Brick

Locked

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Picture Quality

Contrast

N/A

Checkerboard Picture

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Native Contrast

Inf : 1

Lock : 1

Contrast With Local Dimming

Inf : 1

Lock : 1

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Local Dimming

N/A

Local Dimming Video

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Local Dimming

Locked

Backlight

No Backlight

Locked

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SDR Brightness

6.3

N/A

Real Scene

181 cd/m²

Lock cd/m²

Peak 2% Window

347 cd/m²

Lock cd/m²

Peak 10% Window

346 cd/m²

Lock cd/m²

Peak 25% Window

348 cd/m²

Lock cd/m²

Peak 50% Window

282 cd/m²

Lock cd/m²

Peak 100% Window

223 cd/m²

Lock cd/m²

Sustained 2% Window

345 cd/m²

Lock cd/m²

Sustained 10% Window

344 cd/m²

Lock cd/m²

Sustained 25% Window

345 cd/m²

Lock cd/m²

Sustained 50% Window

281 cd/m²

Lock cd/m²

Sustained 100% Window

222 cd/m²

Lock cd/m²

Automatic Brightness Limiting (ABL)

0.030

Lock

Minimum Brightness

12 cd/m²

Lock cd/m²

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HDR Brightness

7.0

N/A

EOTF

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VESA DisplayHDR Certification

DisplayHDR TRUE BLACK 400

Locked

Real Scene

445 cd/m²

Lock cd/m²

Peak 2% Window

1,255 cd/m²

Lock cd/m²

Peak 10% Window

814 cd/m²

Lock cd/m²

Peak 25% Window

453 cd/m²

Lock cd/m²

Peak 50% Window

330 cd/m²

Lock cd/m²

Peak 100% Window

269 cd/m²

Lock cd/m²

Sustained 2% Window

1,155 cd/m²

Lock cd/m²

Sustained 10% Window

750 cd/m²

Lock cd/m²

Sustained 25% Window

412 cd/m²

Lock cd/m²

Sustained 50% Window

299 cd/m²

Lock cd/m²

Sustained 100% Window

242 cd/m²

Lock cd/m²

Automatic Brightness Limiting (ABL)

0.093

Lock

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Gray Uniformity

8.7

N/A

50% Uniformity Picture

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50% Std. Dev.

1.546%

Lock%

50% DSE

0.125%

Lock%

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Black Uniformity

N/A

Native Black Uniformity Picture

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Native Std. Dev.

0.323%

Lock%

Black Uniformity Picture With Local Dimming

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Std. Dev. w/ L.D.

N/A

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Color Accuracy (Pre-Calibration)

8.0

N/A

Pre Calibration Picture

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Pre Gamma Curve Picture

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Pre Color Picture

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Picture Mode

sRGB

Locked

sRGB Gamut Area xy

99.7%

Lock%

White Balance dE (Avg.)

5.21

Lock

Color Temperature (Avg.)

6,152 K

Lock K

Gamma (Avg.)

2.02

Lock

Color dE (Avg.)

2.89

Lock

Contrast Setting

Lock

RGB Settings

50-50-50

Locked

Gamma Setting

Mode 2

Locked

Brightness Setting

Lock

Measured Brightness

86 cd/m²

Lock cd/m²

Brightness Locked

Locked

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Color Accuracy (Post-Calibration)

9.4

N/A

Post Calibration Picture

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Post Gamma Curve Picture

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Post Color Picture

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Picture Mode

Gamer 1

Locked

sRGB Gamut Area xy

101.8%

Lock%

White Balance dE (Avg.)

0.67

Lock

Color Temperature (Avg.)

6,564 K

Lock K

Gamma (Avg.)

2.23

Lock

Color dE (Avg.)

1.57

Lock

Contrast Setting

Lock

RGB Settings

50-55-56

Locked

Gamma Setting

Mode 2

Locked

Brightness Setting

Lock

Measured Brightness

100 cd/m²

Lock cd/m²

ICC Profile

Download

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SDR Color Gamut

9.6

N/A

sRGB Color Gamut Picture

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sRGB Coverage xy

100.0%

Lock%

sRGB Picture Mode

Gamer 1

Locked

Adobe RGB Color Gamut Picture

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Adobe RGB Coverage xy

89.7%

Lock%

Adobe RGB Picture Mode

Gamer 1

Locked

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HDR Color Gamut

9.3

N/A

Wide Color Gamut

Yes

Locked

DCI-P3 Color Gamut Picture

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DCI-P3 Coverage xy

98.1%

Lock%

DCI-P3 Picture Mode

Gamer 1

Locked

Rec. 2020 Color Gamut Picture

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Rec. 2020 Coverage xy

71.0%

Lock%

Rec. 2020 Picture Mode

Gamer 1

Locked

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HDR Color Volume

8.1

N/A

DCI-P3 Color Volume ITP Picture

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1,000 cd/m² DCI-P3 Coverage ICtCp

73.4%

Lock%

DCI-P3 Picture Mode

Gamer 1

Locked

Rec. 2020 Color Volume ITP Picture

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10,000 cd/m² Rec. 2020 Coverage ICtCp

36.5%

Lock%

Rec. 2020 Picture Mode

Gamer 1

Locked

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Viewing Angle

9.9

N/A

Viewing Angle Video

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Chroma Graph

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Color Washout From Left

70°

Lock°

Color Washout From Right

70°

Lock°

Hue Graph

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Color Shift From Left

61°

Lock°

Color Shift From Right

68°

Lock°

Lightness Graph

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Brightness Loss From Left

70°

Lock°

Brightness Loss From Right

70°

Lock°

Black Level Raise From Left

70°

Lock°

Black Level Raise From Right

70°

Lock°

Gamma Shift From Left

70°

Lock°

Gamma Shift From Right

70°

Lock°

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Text Clarity

6.5

N/A

ClearType On

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ClearType Off

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Panel Type

OLED

Locked

Pixels

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Subpixel Layout

RGWB

Locked

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Direct Reflections

8.0

N/A

Ring Light Picture

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Direct Reflections Graph

Preview Graph

SAMPLE

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Peak Direct Reflection Intensity

16.2%

Lock%

Screen Finish

Matte

Locked

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Ambient Black Level Raise

8.0

N/A

Black Level Raise Picture

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Ambient Black Level Raise Graph

Preview Graph

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Black Luminance @ 0 lx

0.00 cd/m²

Lock cd/m²

Black Luminance @ 1000 lx

0.96 cd/m²

Lock cd/m²

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Total Reflected Light

8.4

N/A

Bright Room Off Picture

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Total Reflection Ring Light Picture

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Total Reflected Light Intensity

12,267% ⋅ pixel

Lock% ⋅ pixel

Diffraction Artifacts

Locked

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Gradient

9.5

N/A

Gradient Picture

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Color Depth

10 Bit

Lock Bit

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Motion

Refresh Rate

8.8

N/A

Native Refresh Rate

480 Hz

Lock Hz

Max Refresh Rate

480 Hz

Lock Hz

Max Refresh Rate Over DP

480 Hz

Lock Hz

Max Refresh Rate Over HDMI

480 Hz

Lock Hz

Max Refresh Rate Over DP @ 10-bit

480 Hz

Lock Hz

Max Refresh Rate Over HDMI @ 10-Bit

480 Hz

Lock Hz

DSC Toggle

Locked

DSC Off Max Refresh Rate Over DP

N/A

DSC Off Max Refresh Rate Over HDMI

N/A

Variable Refresh Rate (VRR)

Variable Refresh Rate

Yes

Locked

FreeSync

Yes

Locked

G-SYNC

Compatible (NVIDIA Certified)

Locked

VRR Maximum

480 Hz

Lock Hz

VRR Minimum

< 20 Hz

Locked

VRR Supported Connectors

DisplayPort, HDMI

Locked

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VRR Motion Performance

9.9

N/A

Pursuit Photo VRR

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OD Mode CAD Comparison

Preview Graph

SAMPLE

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Recommended VRR OD Setting

No OD Mode

Locked

Variable Overdrive Advertised

Locked

Avg. CAD

Lock

Best CAD

Lock

Worst CAD

Lock

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Refresh Rate Compliance

9.8

N/A

Fast GTG Sequence

Preview Graph

SAMPLE

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VRR Compliance

Preview Graph

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Compliance @ Max Hz

91%

Lock%

Compliance @ 120 FPS

97%

Lock%

Compliance @ 60 FPS

98%

Lock%

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CAD @ Max Refresh Rate

9.9

N/A

Pursuit Photo At Max Refresh

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CAD Heatmap At Max Refresh

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OD Transition Max Refresh Rate

OD noodmode

0 to 31

Cycle through frames

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Recommended Overdrive Setting

No OD Mode

Locked

Avg. CAD

Lock

Best 10% CAD

Lock

Worst 10% CAD

Lock

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Response Time @ Max Refresh Rate

First Response Time

0.2 ms

Lock ms

Total Response Time

0.4 ms

Lock ms

Recommended Overdrive Setting

No OD Mode

Locked

RGB Overshoot

0 RGB

Lock RGB

Worst 10% RGB Overshoot

0 RGB

Lock RGB

Worst 10% First Response Time

0.3 ms

Lock ms

Worst 10% Total Response Time

1.8 ms

Lock ms

Heatmap First Response

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Heatmap Total Response

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Heatmap RGB Overshoot

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CAD @ 120Hz

9.9

N/A

Pursuit Photo 120Hz

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CAD Heatmap 120Hz

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OD Transition 120Hz

OD noodmode

0 to 31

Cycle through frames

Get Insider Accessfor multiple image controls

Recommended Overdrive Setting

No OD Mode

Locked

Avg. CAD

Lock

Best 10% CAD

Lock

Worst 10% CAD

Lock

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Response Time @ 120Hz

Worst 10% First Response Time

0.5 ms

Lock ms

RGB Overshoot

0 RGB

Lock RGB

Total Response Time

0.3 ms

Lock ms

First Response Time

0.3 ms

Lock ms

Recommended Overdrive Setting

No OD Mode

Locked

Worst 10% Total Response Time

1.1 ms

Lock ms

Worst 10% RGB Overshoot

1 RGB

Lock RGB

120Hz First Response Heatmap

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120Hz Total Response Heatmap

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120Hz Heatmap RGB Overshoot

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Show Text

CAD @ 60Hz

9.9

N/A

Pursuit Photo 60Hz

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CAD Heatmap 60Hz

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OD Transition 60Hz

OD noodmode

0 to 31

Cycle through frames

Get Insider Accessfor multiple image controls

Recommended Overdrive Setting

No OD Mode

Locked

Avg. CAD

Lock

Best 10% CAD

Lock

Worst 10% CAD

Lock

Show Text

Response Time @ 60Hz

Recommended Overdrive Setting

No OD Mode

Locked

First Response Time

0.4 ms

Lock ms

Total Response Time

0.4 ms

Lock ms

RGB Overshoot

0 RGB

Lock RGB

Worst 10% Total Response Time

0.6 ms

Lock ms

Worst 10% First Response Time

0.6 ms

Lock ms

Worst 10% RGB Overshoot

0 RGB

Lock RGB

60Hz First Response Heatmap

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60Hz Total Response Heatmap

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60Hz RGB Overshoot Heatmap

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Show Text

Backlight Strobing (BFI)

Backlight Strobing Picture

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Backlight Strobing Frequency Picture

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Backlight Strobing (BFI)

No BFI

Locked

Maximum Frequency

N/A

Minimum Frequency

N/A

Longest Pulse Width Brightness

N/A

Shortest Pulse Width Brightness

N/A

Pulse Width Control

No BFI

Locked

Pulse Phase Control

No BFI

Locked

Pulse Amplitude Control

No BFI

Locked

VRR At The Same Time

No BFI

Locked

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VRR Flicker

4.5

N/A

VRR Flicker Video

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VRR Flicker Graph

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Dark Gray Flicker

5.4 RGB

Lock RGB

Middle Gray Flicker

2.6 RGB

Lock RGB

Light Gray Flicker

2.4 RGB

Lock RGB

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Image Flicker

N/A

Backlight Picture

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Flicker-Free

Locked

PWM Dimming Frequency

0 Hz

Locked

Show Text

Inputs

Input Lag

9.3

N/A

Native Resolution @ Max Hz

1.9 ms

Lock ms

Native Resolution @ 120Hz

5.4 ms

Lock ms

Native Resolution @ 60Hz

10.5 ms

Lock ms

Backlight Strobing (BFI)

N/A

Show Text

Resolution

7.5

N/A

Native Resolution

2560 x 1440

Locked

Aspect Ratio

16:9

Locked

Megapixels

3.7 MP

Lock MP

Pixel Density

109 PPI

Lock PPI

PS5 Compatibility

9.3

N/A

PS5 Compatibility Photo

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PS5 Compatibility Table

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4k @ 120Hz

Yes

Locked

4k @ 60Hz

Yes

Locked

1440p @ 120Hz

Yes

Locked

1440p @ 60Hz

Yes

Locked

1080p @ 120Hz

Yes

Locked

1080p @ 60Hz

Yes

Locked

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Xbox Series X|S Compatibility

9.3

N/A

XSX Compatibility Photo

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XSX Compatibility Table

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4k @ 120Hz

Yes

Locked

4k @ 60Hz

Yes

Locked

1440p @ 120Hz

Yes

Locked

1440p @ 60Hz

Yes

Locked

1080p @ 120Hz

Yes

Locked

1080p @ 60Hz

Yes

Locked

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Inputs

Inputs 1

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Inputs 2

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DisplayPort

1 (DP 2.1)

Locked

DisplayPort Transmission Bandwidth

UHBR13.5 (54.00 Gbps)

Locked

Mini DisplayPort

Locked

HDMI

2 (HDMI 2.1)

Locked

HDMI 2.1 Bandwidth

48Gbps (FRL 12x4)

Locked

Daisy Chaining

Locked

3.5mm Audio Out

Yes

Locked

Ethernet

Locked

HDR10

Yes

Locked

Dolby Vision

Locked

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USB

USB-A Ports

Locked

USB-A Rated Speed

5Gbps (USB 3.2 Gen 1)

Locked

USB-B Upstream Port

Yes

Locked

USB-C Ports

Locked

USB-C Upstream

No USB-C Ports

Locked

USB-C Rated Speed

No USB-C Ports

Locked

USB-C Power Delivery

No USB-C Ports

Locked

USB-C DisplayPort Alt Mode

No USB-C Ports

Locked

Thunderbolt

Locked

macOS Compatibility

macOS Screenshot

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Features

Additional Features

Speakers

Locked

RGB Illumination

Presets

Locked

Multiple Input Display

Locked

KVM Switch

Locked

Smart OS

Locked

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On-Screen Display (OSD)

OSD Picture

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Check Price

27"

27GX790A-B

27"

27GX790B-B

27"

27GX790A-B

27"

27GX790B-B

27"

27GX790A-B

27"

27GX790B-B

27"

27GX790A-B

27"

27GX790B-B

27"

27GX790A-B

27"

27GX790B-B