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  1. Table of Contents
  2. Top
  3. Main Differences
  4. Design
    1. Style
    2. Stand
    3. Ergonomics
    4. Back
    5. Borders
    6. Thickness
    7. Build Quality
  5. Picture Quality
    1. Contrast
    2. Local Dimming
    3. SDR Peak Brightness
    4. HDR Peak Brightness
    5. Horizontal Viewing Angle
    6. Vertical Viewing Angle
    7. Gray Uniformity
    8. Black Uniformity
    9. Pre Calibration
    10. Post Calibration
    11. SDR Color Gamut
    12. SDR Color Volume
    13. HDR Color Gamut
    14. HDR Color Volume
    15. Image Retention
    16. Gradient
    17. Color Bleed
    18. Reflections
    19. Text Clarity
  6. Motion
    1. Response Time @ Max Refresh Rate
    2. Response Time @ 60Hz
    3. Image Flicker
    4. Black Frame Insertion (BFI)
    5. Refresh Rate
  7. Inputs
    1. Input Lag
    2. Resolution And Size
    3. Inputs
    4. Total Inputs
  8. Features
    1. Additional Features
    2. On-Screen Display (OSD)
    3. Controls
    4. In The Box
  9. Comments

LG 27UK650-W vs LG UltraFine 4k

Side-by-Side Comparison

Products

LG 27UK650-W
LG UltraFine 4k

Tested using Methodology v1.1

Updated May 24, 2024 02:06 PM

SEE PRICE
Amazon.com

Tested using Methodology v1.0

Updated Apr 15, 2024 02:42 PM

SEE PRICE
Amazon.com
LG 27UK650-W Picture
LG UltraFine 4k Picture

Variants

  • 27UK650-W (27")
  • UltraFine 4k (23.7")

Our Verdict

LG 27UK650-W

LG UltraFine 4k

The LG 27UK650-W is much better than the LG UltraFine 4k. The 27UK650 has better ergonomics, better reflection handling, a flicker-free backlight, and it supports HDR. The 27UK650 also has better gaming performance, with less input lag and support for FreeSync variable refresh rate technology.

0

Check Price

23.7"
UltraFine 4k
SEE PRICE
Amazon.com
23.7"
UltraFine 4k
SEE PRICE
B&H
27"
27UK650-W
SEE PRICE
B&H
23.7"
UltraFine 4k
SEE PRICE
Walmart.com
23.7"
UltraFine 4k
BestBuy.com

Notice: Two or more of the products selected have been tested with different test methodologies, so some of the results below aren't directly comparable. Learn how our test benches and scoring system work, and read more about the latest changes to our monitors test methodology.

Main Differences for

Threshold 

0.10

Mixed Usage 

7.9
7.4

Image Flicker 
 

10
5.7

Full Comparison

Design

Style  

Design Picture  

LG 27UK650-W Design Picture
LG UltraFine 4k Design Picture

Size  

27"
24"

Curved  

No
No

Curve Radius  

Not Curved
N/A

Weight (without stand) 
 

9.9 lbs (4.5 kg)
11.5 lbs (5.2 kg)

Weight (with stand) 
 

13.4 lbs (6.1 kg)
15.4 lbs (7.0 kg)

Show text

Stand  

Stand Picture  

LG 27UK650-W Stand Picture
LG UltraFine 4k Stand Picture

Width 
 

17.9" (45.5 cm)
7.7" (19.6 cm)

Depth 
 

9.1" (23.1 cm)
9.1" (23.1 cm)

Show text

Ergonomics 
 

5.9
4.7

Ergonomics Picture  

LG 27UK650-W Ergonomics Picture
LG UltraFine 4k Ergonomics Picture

Height Adjustment 
 

4.3" (10.9 cm)
4.3" (10.9 cm)

Switch Portrait/Landscape  

Yes, Clockwise
No

Swivel Range  

No swivel
N/A

Tilt Range  

-17.5° to 2.5°
-25° to 5°

Show text

Back  

Back Picture  

LG 27UK650-W Back Picture
LG UltraFine 4k Back Picture

Wall Mount  

VESA 100x100
VESA 100x100

Show text

Borders  

Borders Picture  

LG 27UK650-W Borders Picture
LG UltraFine 4k Borders Picture

Borders 
 

0.3" (0.8 cm)
0.7" (1.8 cm)

Show text

Thickness  

Thickness Picture  

LG 27UK650-W Thickness Picture
LG UltraFine 4k Thickness Picture

Thickness (with stand) 
 

5.6" (14.2 cm)
5.7" (14.5 cm)

Thickness (without stand) 
 

1.7" (4.3 cm)
2.0" (5.1 cm)

Show text

Build Quality 
 

6.5
7.5

Build Quality Picture  

LG 27UK650-W Build Quality Picture
LG UltraFine 4k Build Quality Picture

Show text

Picture Quality

Contrast 
 

6.3
6.6

Checkerboard Picture  

LG 27UK650-W Checkerboard Picture
LG UltraFine 4k Checkerboard Picture

LCD Type 
 

IPS
IPS

Native Contrast 
 

1,196 : 1
1,445 : 1

Contrast With Local Dimming 
 

N/A
N/A

Show text

Local Dimming 
 

0.0
0.0

Local Dimming Video  

Local Dimming Video  

Local Dimming 
 

No
No

Backlight 
 

Direct
Edge

Show text

SDR Peak Brightness 
 

8.0
8.6

SDR Real Scene 
 

352 cd/m²
554 cd/m²

SDR Peak 2% Window 
 

351 cd/m²
563 cd/m²

SDR Peak 10% Window 
 

352 cd/m²
563 cd/m²

SDR Peak 25% Window 
 

352 cd/m²
563 cd/m²

SDR Peak 50% Window 
 

352 cd/m²
563 cd/m²

SDR Peak 100% Window 
 

351 cd/m²
562 cd/m²

SDR Sustained 2% Window 
 

350 cd/m²
562 cd/m²

SDR Sustained 10% Window 
 

351 cd/m²
562 cd/m²

SDR Sustained 25% Window 
 

351 cd/m²
562 cd/m²

SDR Sustained 50% Window 
 

351 cd/m²
561 cd/m²

SDR Sustained 100% Window 
 

350 cd/m²
561 cd/m²

SDR ABL 
 

0.000
0.000

Show text

HDR Peak Brightness 
 

6.6
0.0

HDR Real Scene 
 

385 cd/m²
N/A

HDR Peak 2% Window 
 

360 cd/m²
N/A

HDR Peak 10% Window 
 

361 cd/m²
N/A

HDR Peak 25% Window 
 

361 cd/m²
N/A

HDR Peak 50% Window 
 

361 cd/m²
N/A

HDR Peak 100% Window 
 

377 cd/m²
N/A

HDR Sustained 2% Window 
 

357 cd/m²
N/A

HDR Sustained 10% Window 
 

359 cd/m²
N/A

HDR Sustained 25% Window 
 

360 cd/m²
N/A

HDR Sustained 50% Window 
 

360 cd/m²
N/A

HDR Sustained 100% Window 
 

361 cd/m²
N/A

HDR ABL 
 

0.001
N/A

Show text

Horizontal Viewing Angle 
 

8.1
7.3

Horizontal Viewing Angle Video  

Horizontal Chroma Graph  

LG 27UK650-W Horizontal Chroma Graph

Color Washout From Left 
 

43°

Color Washout From Right 
 

42°

Horizontal Color Shift Picture  

LG UltraFine 4k Horizontal Color Shift Picture

Horizontal Hue Graph  

LG 27UK650-W Horizontal Hue Graph

Color Shift From Left 
 

58°
37°

Color Shift From Right 
 

60°
40°

Horizontal Brightness Picture  

LG UltraFine 4k Horizontal Brightness Picture

Horizontal Black Level Picture  

LG UltraFine 4k Horizontal Black Level Picture

Horizontal Lightness Graph  

LG 27UK650-W Horizontal Lightness Graph

Brightness Loss From Left 
 

48°
45°

Brightness Loss From Right 
 

48°
48°

Black Level Raise From Left 
 

70°
75°

Black Level Raise From Right 
 

70°
75°

Curve Radius  

N/A

Gamma Shift From Left 
 

42°

Gamma Shift From Right 
 

41°

Show text

Vertical Viewing Angle 
 

7.6
8.3

Vertical Viewing Angle Video  

Vertical Chroma Graph  

LG 27UK650-W Vertical Chroma Graph

Color Washout From Below 
 

34°

Color Washout From Above 
 

36°

Vertical Color Shift Picture  

LG UltraFine 4k Vertical Color Shift Picture

Vertical Hue Graph  

LG 27UK650-W Vertical Hue Graph

Color Shift From Below 
 

49°
29°

Color Shift From Above 
 

49°
29°

Vertical Brightness Picture  

LG UltraFine 4k Vertical Brightness Picture

Vertical Black Level Picture  

LG UltraFine 4k Vertical Black Level Picture

Vertical Lightness Graph  

LG 27UK650-W Vertical Lightness Graph

Brightness Loss From Below 
 

34°
37°

Brightness Loss From Above 
 

36°
37°

Black Level Raise From Below 
 

70°
75°

Black Level Raise From Above 
 

70°
75°

Gamma Shift From Below 
 

44°

Gamma Shift From Above 
 

55°

Show text

Gray Uniformity 
 

8.7
8.7

50% Uniformity Picture  

LG 27UK650-W 50% Uniformity Picture
LG UltraFine 4k 50% Uniformity Picture

50% Std. Dev. 
 

3.070%
2.882%

50% DSE 
 

0.109%
0.109%

5% Uniformity Picture  

LG 27UK650-W 5% Uniformity Picture
LG UltraFine 4k 5% Uniformity Picture

5% Std. Dev. 
 

0.352%
0.396%

5% DSE 
 

0.070%
0.053%

Show text

Black Uniformity 
 

6.0
6.3

Native Black Uniformity Picture  

LG 27UK650-W Native Black Uniformity Picture
LG UltraFine 4k Native Black Uniformity Picture

Native Std. Dev. 
 

2.002%
1.805%

Black Uniformity Picture With Local Dimming  

LG 27UK650-W Black Uniformity Picture With Local Dimming
LG UltraFine 4k Black Uniformity Picture With Local Dimming

Std. Dev. w/ L.D. 
 

N/A
N/A

Show text

Pre Calibration 
 

8.1
7.7

Pre Calibration Picture  

LG 27UK650-W Pre Calibration Picture
LG UltraFine 4k Pre Calibration Picture

Pre Gamma Curve Picture  

LG 27UK650-W Pre Gamma Curve Picture
LG UltraFine 4k Pre Gamma Curve Picture

Pre Color Picture  

LG 27UK650-W Pre Color Picture
LG UltraFine 4k Pre Color Picture

Picture Mode 
 

SMPTE-C
N/A

Luminance 
 

227 cd/m²
292 cd/m²

Luminance Settings 
 

50
50

Contrast Setting 
 

70
N/A

RGB Controls 
 

N/A
N/A

Gamma Setting 
 

No Gamma Setting

Color Temperature 
 

6,746 K
6,427 K

White Balance dE 
 

2.17
2.02

Color dE 
 

2.65
3.54

Gamma 
 

2.16
2.24

Show text

Post Calibration 
 

9.5
9.7

Post Calibration Picture  

LG 27UK650-W Post Calibration Picture
LG UltraFine 4k Post Calibration Picture

Post Gamma Curve Picture  

LG 27UK650-W Post Gamma Curve Picture
LG UltraFine 4k Post Gamma Curve Picture

Post Color Picture  

LG 27UK650-W Post Color Picture
LG UltraFine 4k Post Color Picture

Picture Mode 
 

Custom
N/A

Luminance 
 

102 cd/m²
103 cd/m²

Luminance Settings 
 

17
18

Contrast Setting 
 

71
N/A

RGB Controls 
 

46-50-48
N/A

Gamma Setting 
 

Mode 4

Color Temperature 
 

6,435 K
6,455 K

White Balance dE 
 

0.71
0.51

Color dE 
 

0.68
0.29

Gamma 
 

2.18
2.18

Show text

SDR Color Gamut 
 

8.8
9.3

Color Gamut sRGB Picture  

LG 27UK650-W Color Gamut sRGB Picture
LG UltraFine 4k Color Gamut sRGB Picture

sRGB xy 
 

98.5%
99.6%

Color Gamut ARGB Picture  

LG 27UK650-W Color Gamut ARGB Picture
LG UltraFine 4k Color Gamut ARGB Picture

Adobe RGB xy 
 

76.4%
84.9%

sRGB Picture Mode 
 

Custom

Adobe RGB Picture Mode 
 

Photo

Show text

SDR Color Volume 
 

9.0
9.4

sRGB Color Volume ITP Picture  

LG 27UK650-W sRGB Color Volume ITP Picture
LG UltraFine 4k sRGB Color Volume ITP Picture

sRGB In ICtCp 
 

98.9%
97.8%

Adobe RGB Color Volume ITP Picture  

LG 27UK650-W Adobe RGB Color Volume ITP Picture
LG UltraFine 4k Adobe RGB Color Volume ITP Picture

Adobe RGB In ICtCp 
 

81.2%
89.5%

sRGB Picture Mode 
 

Custom

Adobe RGB Picture Mode 
 

Photo

Show text

HDR Color Gamut 
 

6.9
0.0

Wide Color Gamut 
 

No
N/A

Color Gamut DCI-P3 Picture  

LG 27UK650-W Color Gamut DCI-P3 Picture
LG UltraFine 4k Color Gamut DCI-P3 Picture

DCI P3 xy 
 

78.8%
N/A

Color Gamut Rec.2020 Picture  

LG 27UK650-W Color Gamut Rec.2020 Picture
LG UltraFine 4k Color Gamut Rec.2020 Picture

Rec. 2020 xy 
 

57.5%
N/A

DCI P3 Picture Mode 
 

HDR Standard

Rec. 2020 Picture Mode 
 

HDR Standard

Show text

HDR Color Volume 
 

5.9
0.0

P3 Color Volume ITP Picture  

LG 27UK650-W P3 Color Volume ITP Picture
LG UltraFine 4k P3 Color Volume ITP Picture

DCI-P3 In ICtCp 
 

68.4%
N/A

2020 Color Volume ITP Picture  

LG 27UK650-W 2020 Color Volume ITP Picture
LG UltraFine 4k 2020 Color Volume ITP Picture

Rec. 2020 In ICtCp 
 

49.1%
N/A

DCI P3 Picture Mode 
 

HDR Standard

Rec. 2020 Picture Mode 
 

HDR Standard

Show text

Image Retention 
 

9.3
5.6

Image Retention Picture  

LG 27UK650-W Image Retention Picture
LG UltraFine 4k Image Retention Picture

IR After 0 Min Recovery 
 

0.26%
0.37%

IR After 2 Min Recovery 
 

0.00%
0.10%

IR After 4 Min Recovery 
 

0.00%
0.00%

IR After 6 Min Recovery 
 

0.00%
0.00%

IR After 8 Min Recovery 
 

0.00%
0.00%

IR After 10 Min Recovery 
 

0.00%
0.00%

Show text

Gradient 
 

9.9
9.9

Gradient Picture  

LG 27UK650-W Gradient Picture
LG UltraFine 4k Gradient Picture

Color Depth 
 

10 Bit
10 Bit

Show text

Color Bleed 
 

10
10

Color Bleed Horizontal  

LG 27UK650-W Color Bleed Horizontal
LG UltraFine 4k Color Bleed Horizontal

Pixel Row Error 
 

0.000%
0.004%

Color Bleed Vertical  

LG 27UK650-W Color Bleed Vertical
LG UltraFine 4k Color Bleed Vertical

Pixel Column Error 
 

0.000%
0.004%

Show text

Reflections 
 

7.3
6.0

Average Room  

LG 27UK650-W Average Room
LG UltraFine 4k Average Room

Average Room Off Picture  

LG 27UK650-W Average Room Off Picture
LG UltraFine 4k Average Room Off Picture

Bright Room Off Picture  

LG 27UK650-W Bright Room Off Picture
LG UltraFine 4k Bright Room Off Picture

Screen Finish 
 

Matte

Total Reflections 
 

5.6%

Indirect Reflections 
 

3.0%

Calculated Direct Reflections 
 

2.6%

Show text

Text Clarity 
 

9.5

ClearType On  

LG 27UK650-W ClearType On

Pixel Type 
 

IPS
IPS

ClearType Off  

LG 27UK650-W ClearType Off

Pixels  

LG 27UK650-W Pixels

Sub-Pixel Layout 
 

RGB

Show text

Motion

Response Time @ Max Refresh Rate 
 

8.3
8.5

Motion Blur Picture  

LG UltraFine 4k Motion Blur Picture

Motion Blur Picture  

LG 27UK650-W Motion Blur Picture

Response Time Chart  

LG UltraFine 4k Response Time Chart

Response Time Table  

LG 27UK650-W Response Time Table

Best Overdrive Setting 
 

Normal
N/A

Rise / Fall Time 
 

6.8 ms
5.6 ms

Total Response Time 
 

13.5 ms
13.9 ms

Overshoot Error 
 

1.3%

Dark Rise / Fall Time 
 

7.4 ms

Dark Total Response Time 
 

14.7 ms

Dark Overshoot Error 
 

2.8%

Show text

Response Time @ 60Hz 
 

8.3

Motion Blur Picture  

LG 27UK650-W Motion Blur Picture

Response Time Table  

LG 27UK650-W Response Time Table

Best Overdrive Setting 
 

Normal

Rise / Fall Time 
 

6.8 ms

Total Response Time 
 

13.5 ms

Overshoot Error 
 

1.3%

Dark Rise / Fall Time 
 

7.4 ms

Dark Total Response Time 
 

14.7 ms

Dark Overshoot Error 
 

2.8%

Show text

Image Flicker 
 

10
5.7

Backlight Picture  

LG 27UK650-W Backlight Picture
LG UltraFine 4k Backlight Picture

Flicker-Free  

Yes
No

PWM Dimming Frequency 
 

0 Hz
700 Hz

Black Frame Insertion (BFI) 
 

No BFI
No

BFI Picture  

LG 27UK650-W BFI Picture
LG UltraFine 4k BFI Picture

BFI Frequency Picture  

LG 27UK650-W BFI Frequency Picture
LG UltraFine 4k BFI Frequency Picture

BFI Maximum Frequency 
 

N/A
N/A

BFI Minimum Frequency 
 

N/A
N/A

Show text

Black Frame Insertion (BFI) 
 

0.0

Black Frame Insertion (BFI) 
 

No BFI
No

BFI Picture  

LG 27UK650-W BFI Picture
LG UltraFine 4k BFI Picture

BFI Frequency Picture  

LG 27UK650-W BFI Frequency Picture
LG UltraFine 4k BFI Frequency Picture

BFI Maximum Frequency 
 

N/A
N/A

BFI Minimum Frequency 
 

N/A
N/A

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Refresh Rate 
 

7.4
6.7

Variable Refresh Rate 
 

FreeSync
No

Native 
 

60 Hz

Max Refresh Rate 
 

60 Hz
60 Hz

Factory Overclock 
 

N/A

Variable Refresh Rate 
 

Yes
No

FreeSync 
 

Yes

G-SYNC 
 

Partially Compatible
No

VRR Maximum 
 

60 Hz
N/A

VRR Minimum 
 

40 Hz
N/A

VRR Maximum With OC 
 

N/A

VRR Supported Connectors  

DisplayPort, HDMI
N/A

Show text

Inputs

Input Lag 
 

9.0
8.4

Native Resolution 
 

8.8 ms
13.2 ms

Non-Native Res @ Native Refresh 
 

11.3 ms

Native Resolution @ 60Hz 
 

8.8 ms
13.2 ms

Variable Refresh Rate 
 

9.2 ms
N/A

Variable Refresh Rate @ 60Hz 
 

9.4 ms

10 Bit HDR 
 

8.9 ms
N/A

Black Frame Insertion (BFI) 
 

N/A
N/A

Show text

Resolution And Size 
 

9.2
8.9

Native Resolution  

3840 x 2160
3840 x 2160

Aspect Ratio  

16:9
16:9

Megapixels  

8.3 MP
8.3 MP

Pixel Density 
 

164 PPI
186 PPI

Screen Diagonal  

26.9"
23.7"

Screen Area  

310 in²
240 in²

Show text

Inputs  

Inputs 1  

LG 27UK650-W Inputs 1
LG UltraFine 4k Inputs 1

Inputs 2  

LG 27UK650-W Inputs 2
LG UltraFine 4k Inputs 2

Total Inputs  

DisplayPort  

1 (DP 1.2)
No

Mini DisplayPort  

No
No

HDMI  

2 (HDMI 2.0)
No

DVI  

No
No

VGA  

No
No

DisplayPort Out  

No
No

USB  

No
No

USB C  

No
5 (2x Thunderbolt 3 with PD, 3x USB-C)

Analog Audio Out 3.5mm  

1
No

Microphone In 3.5mm  

No
No

Digital Optical Audio Out  

No
No

Analog Audio Out RCA  

No
No

Power Supply  

External Brick
Internal

Show text

Features

Additional Features 
 

RGB Illumination 
 

No

Speakers 
 

No
Yes

HDR10  

Yes
No

Multiple Input Display 
 

No
No

Show text

On-Screen Display (OSD)  

OSD Picture  

LG 27UK650-W OSD Picture
LG UltraFine 4k OSD Picture

Show text

Controls  

Controls Picture  

LG 27UK650-W Controls Picture
LG UltraFine 4k Controls Picture

Show text

In The Box  

In The Box Picture  

LG 27UK650-W In The Box Picture
LG UltraFine 4k In The Box Picture

Show text

Check Price

23.7"
UltraFine 4k
SEE PRICE
Amazon.com
23.7"
UltraFine 4k
SEE PRICE
B&H
27"
27UK650-W
SEE PRICE
B&H
23.7"
UltraFine 4k
SEE PRICE
Walmart.com
23.7"
UltraFine 4k
BestBuy.com

LG 27UK650-W

LG UltraFine 4k

Comments

  1. Comparison

LG 27UK650-W vs LG UltraFine 4k: Main Discussion

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