Products
LG 27UK650-W
Dell S2721QS
Tested using Methodology v1.1
Updated Jun 07, 2024 08:44 PM
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Amazon.com
Tested using Methodology v2.0.1
Updated Sep 30, 2025 04:33 PM
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Max Refresh Rate
60 Hz
Size
27"
Pixel Type
IPS
Native Resolution
3840 x 2160
Variable Refresh Rate
FreeSync
Max Refresh Rate
60 Hz
Size
27"
Pixel Type
IPS
Native Resolution
3840 x 2160
Variable Refresh Rate
Yes
Our Verdict
LG 27UK650-W
Dell S2721QS
Overall, the Dell S2721QS is a bit better than the LG 27UK650-W. The Dell has better ergonomics, wider viewing angles, and better reflection handling. On the other hand, the LG has better out-of-the-box color accuracy.
Variants
- 27UK650-W (27")
- S2721QS (27")
Check Price
27"
27UK650-W
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27"
S2721QS
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Amazon.com
27"
27UK650-W
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Walmart.com
27"
S2721QS
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Walmart.com
27"
27UK650-W
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B&H
27"
S2721QS
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B&H
27"
27UK650-W
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27"
S2721QS
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27"
27UK650-W
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Main Differences for
Mixed Usage
Mixed Usage
Threshold
Mixed Usage
7.9
Full Comparison
Design
Style
Design Picture
Curved
No
No
Curve Radius
Not Curved
Not Curved
Size
27"
27"
Weight (without stand)
9.9 lbs (4.5 kg)
10.6 lbs (4.8 kg)
Weight (with stand)
13.4 lbs (6.1 kg)
13.9 lbs (6.3 kg)
Accelerated Longevity Test
Uniformity Pictures
Longevity Graph
Build Quality
6.5
7.5
Build Quality Picture
Ergonomics
5.9
8.8
Ergonomics Picture
Back Picture
Height Adjustment
4.3" (10.9 cm)
4.3" (11.0 cm)
Min Height To Top Of Panel
15.4" (39.0 cm)
Tilt Range
-17.5° to 2.5°
-20° to 2.5°
Rotate Portrait/Landscape
Yes, Clockwise
Yes, Both Ways
Swivel Range
No swivel
-30° to 30°
Wall Mount
VESA 100x100
VESA 100x100
Stand
Stand Picture
Thickness Picture
Base Width
17.9" (45.5 cm)
10.2" (25.9 cm)
Base Depth
9.1" (23.1 cm)
6.9" (17.6 cm)
Thickness (With Display)
5.6" (14.2 cm)
5.1" (13.0 cm)
Weight (With Display)
13.4 lbs (6.1 kg)
13.9 lbs (6.3 kg)
Display
Display Picture
Size
27"
27"
Housing Width
24.1" (61.2 cm)
Housing Height
14.3" (36.3 cm)
Thickness (Without Stand)
1.7" (4.3 cm)
2.0" (5.2 cm)
Weight (Without Stand)
9.9 lbs (4.5 kg)
10.6 lbs (4.8 kg)
Borders Size (Bezels)
0.3" (0.8 cm)
0.3" (0.7 cm)
Controls
Controls Picture
In The Box
In The Box Picture
Power Supply
External Brick
Internal
Back
Back Picture
Wall Mount
VESA 100x100
VESA 100x100
Borders
Borders Picture
Borders
0.3" (0.8 cm)
0.3" (0.7 cm)
Thickness
Thickness Picture
Thickness (with stand)
5.6" (14.2 cm)
5.1" (13.0 cm)
Thickness (without stand)
1.7" (4.3 cm)
2.0" (5.2 cm)
Picture Quality
Contrast
6.3
6.3
Checkerboard Picture
Native Contrast
1,196 : 1
1,221 : 1
Contrast With Local Dimming
N/A
N/A
Local Dimming
0.0
0.0
Local Dimming Video
Local Dimming
No
No
Backlight
Direct
Edge
SDR Brightness
8.0
8.0
Real Scene
352 cd/m²
362 cd/m²
Peak 2% Window
351 cd/m²
369 cd/m²
Peak 10% Window
352 cd/m²
370 cd/m²
Peak 25% Window
352 cd/m²
371 cd/m²
Peak 50% Window
352 cd/m²
373 cd/m²
Peak 100% Window
351 cd/m²
374 cd/m²
Sustained 2% Window
350 cd/m²
368 cd/m²
Sustained 10% Window
351 cd/m²
369 cd/m²
Sustained 25% Window
351 cd/m²
371 cd/m²
Sustained 50% Window
351 cd/m²
372 cd/m²
Sustained 100% Window
350 cd/m²
373 cd/m²
Automatic Brightness Limiting (ABL)
0.000
0.001
Minimum Brightness
32 cd/m²
HDR Brightness
6.6
6.6
EOTF
VESA DisplayHDR Certification
No Certification
Real Scene
385 cd/m²
370 cd/m²
Peak 2% Window
360 cd/m²
387 cd/m²
Peak 10% Window
361 cd/m²
386 cd/m²
Peak 25% Window
361 cd/m²
386 cd/m²
Peak 50% Window
361 cd/m²
385 cd/m²
Peak 100% Window
377 cd/m²
385 cd/m²
Sustained 2% Window
357 cd/m²
386 cd/m²
Sustained 10% Window
359 cd/m²
386 cd/m²
Sustained 25% Window
360 cd/m²
385 cd/m²
Sustained 50% Window
360 cd/m²
385 cd/m²
Sustained 100% Window
361 cd/m²
384 cd/m²
Automatic Brightness Limiting (ABL)
0.001
0.000
Horizontal Viewing Angle
8.1
8.1
Horizontal Viewing Angle Video
Horizontal Chroma Graph
Color Washout From Left
43°
40°
Color Washout From Right
42°
44°
Horizontal Hue Graph
Color Shift From Left
58°
58°
Color Shift From Right
60°
62°
Horizontal Lightness Graph
Brightness Loss From Left
48°
44°
Brightness Loss From Right
48°
48°
Black Level Raise From Left
70°
70°
Black Level Raise From Right
70°
70°
Gamma Shift From Left
42°
42°
Gamma Shift From Right
41°
44°
Vertical Viewing Angle
7.6
8.3
Vertical Viewing Angle Video
Vertical Chroma Graph
Color Washout From Below
34°
35°
Color Washout From Above
36°
37°
Vertical Hue Graph
Color Shift From Below
49°
61°
Color Shift From Above
49°
62°
Vertical Lightness Graph
Brightness Loss From Below
34°
38°
Brightness Loss From Above
36°
38°
Black Level Raise From Below
70°
70°
Black Level Raise From Above
70°
70°
Gamma Shift From Below
44°
60°
Gamma Shift From Above
55°
67°
Gray Uniformity
8.7
7.8
50% Uniformity Picture
50% Std. Dev.
3.070%
4.171%
50% DSE
0.109%
0.142%
5% Uniformity Picture
5% Std. Dev.
0.352%
5% DSE
0.070%
Black Uniformity
6.0
7.1
Native Black Uniformity Picture
Native Std. Dev.
2.002%
1.208%
Black Uniformity Picture With Local Dimming
Std. Dev. w/ L.D.
N/A
N/A
Color Accuracy (Pre-Calibration)
8.1
7.0
Pre Calibration Picture
Pre Gamma Curve Picture
Pre Color Picture
Picture Mode
SMPTE-C
Custom Color
sRGB Gamut Area xy
116.9%
White Balance dE (Avg.)
2.17
3.02
Color Temperature (Avg.)
6,746 K
6,926 K
Gamma (Avg.)
2.16
2.39
Color dE (Avg.)
2.65
3.15
Contrast Setting
70
75
RGB Settings
N/A
100-100-100
Gamma Setting
No Gamma Setting
No Gamma Setting
Brightness Setting
50
75
Measured Brightness
227 cd/m²
334 cd/m²
Brightness Locked
No
Color Accuracy (Post-Calibration)
9.5
9.6
Post Calibration Picture
Post Gamma Curve Picture
Post Color Picture
Picture Mode
Custom
Custom Color
sRGB Gamut Area xy
102.5%
White Balance dE (Avg.)
0.71
0.59
Color Temperature (Avg.)
6,435 K
6,535 K
Gamma (Avg.)
2.18
2.17
Color dE (Avg.)
0.68
0.57
Contrast Setting
71
71
RGB Settings
46-50-48
100-97-97
Gamma Setting
Mode 4
No Gamma Setting
Brightness Setting
17
20
Measured Brightness
102 cd/m²
99 cd/m²
ICC Profile
SDR Color Gamut
8.8
9.4
sRGB Color Gamut Picture
sRGB Coverage xy
98.5%
100.0%
sRGB Picture Mode
Custom
Custom Color
Adobe RGB Color Gamut Picture
Adobe RGB Coverage xy
76.4%
80.5%
Adobe RGB Picture Mode
Photo
Custom Color
HDR Color Gamut
6.9
7.2
Wide Color Gamut
No
Yes
DCI-P3 Color Gamut Picture
DCI-P3 Coverage xy
85.2%
DCI-P3 Picture Mode
HDR Standard
Desktop
Rec. 2020 Color Gamut Picture
Rec. 2020 Coverage xy
57.5%
61.1%
Rec. 2020 Picture Mode
HDR Standard
Desktop
DCI P3 xy
78.8%
HDR Color Volume
5.9
6.7
DCI-P3 Color Volume ITP Picture
1,000 cd/m² DCI-P3 Coverage ICtCp
68.4%
56.3%
DCI-P3 Picture Mode
HDR Standard
Desktop
Rec. 2020 Color Volume ITP Picture
10,000 cd/m² Rec. 2020 Coverage ICtCp
49.1%
24.1%
Rec. 2020 Picture Mode
HDR Standard
Desktop
Text Clarity
9.5
9.0
ClearType On
ClearType Off
Pixel Type
IPS
IPS
Pixels
Subpixel Layout
RGB
RGB
Reflections
7.3
7.8
Average Room
Average Room Off Picture
Bright Room Off Picture
Screen Finish
Matte
Matte
Total Reflections
5.6%
4.5%
Indirect Reflections
3.0%
2.5%
Calculated Direct Reflections
2.6%
2.0%
Gradient
9.9
9.8
Gradient Picture
Color Depth
10 Bit
10 Bit
SDR Color Volume
9.0
sRGB Color Volume ITP Picture
sRGB In ICtCp
98.9%
Adobe RGB Color Volume ITP Picture
Adobe RGB In ICtCp
81.2%
sRGB Picture Mode
Custom
Adobe RGB Picture Mode
Photo
Image Retention
9.3
Image Retention Picture
IR After 0 Min Recovery
0.26%
IR After 2 Min Recovery
0.00%
IR After 4 Min Recovery
0.00%
IR After 6 Min Recovery
0.00%
IR After 8 Min Recovery
0.00%
IR After 10 Min Recovery
0.00%
Color Bleed
10
Color Bleed Horizontal
Pixel Row Error
0.000%
Color Bleed Vertical
Pixel Column Error
0.000%
Motion
Refresh Rate
6.0
Native Refresh Rate
60 Hz
60 Hz
Max Refresh Rate
60 Hz
60 Hz
Max Refresh Rate Over DP
60 Hz
Max Refresh Rate Over HDMI
60 Hz
Max Refresh Rate Over DP @ 10-bit
60 Hz
Max Refresh Rate Over HDMI @ 10-Bit
30 Hz
Variable Refresh Rate (VRR)
Variable Refresh Rate
FreeSync
Yes
FreeSync
Yes
Yes
G-SYNC
Partially Compatible
Compatible (Tested)
VRR Maximum
60 Hz
60 Hz
VRR Minimum
40 Hz
40 Hz
VRR Supported Connectors
DisplayPort, HDMI
DisplayPort
Native
60 Hz
60 Hz
Max Refresh Rate
60 Hz
60 Hz
Variable Refresh Rate
Yes
VRR Motion Performance
5.3
Pursuit Photo VRR
OD Mode CAD Comparison
Recommended VRR OD Setting
Normal
Variable Overdrive Advertised
No
Avg. CAD
373
Best CAD
373
Worst CAD
373
Refresh Rate Compliance
3.9
Fast GTG Sequence
VRR Compliance
Compliance @ Max Hz
59%
Compliance @ 120 FPS
N/A
Compliance @ 60 FPS
59%
CAD @ Max Refresh Rate
4.8
Pursuit Photo At Max Refresh
CAD Heatmap At Max Refresh
OD Transition Max Refresh Rate
OD extreme
0 to 31
Recommended Overdrive Setting
Normal
Avg. CAD
373
Best 10% CAD
215
Worst 10% CAD
583
Response Time @ Max Refresh Rate
First Response Time
6.8 ms
15.2 ms
Total Response Time
13.5 ms
15.2 ms
Recommended Overdrive Setting
Normal
Normal
RGB Overshoot
1.3%
0 RGB
Worst 10% RGB Overshoot
2.8%
0 RGB
Worst 10% First Response Time
7.4 ms
25.0 ms
Worst 10% Total Response Time
14.7 ms
25.0 ms
Heatmap First Response
Heatmap Total Response
Heatmap RGB Overshoot
Motion Blur Picture
Response Time Table
CAD @ 120Hz
0.0
Pursuit Photo 120Hz
CAD Heatmap 120Hz
OD Transition 120Hz
-
0 to 31
Recommended Overdrive Setting
No 120Hz Refresh Rate
Avg. CAD
N/A
Best 10% CAD
N/A
Worst 10% CAD
N/A
Response Time @ 120Hz
Worst 10% First Response Time
N/A
RGB Overshoot
N/A
Total Response Time
N/A
First Response Time
N/A
Recommended Overdrive Setting
No 120Hz Refresh Rate
Worst 10% Total Response Time
N/A
Worst 10% RGB Overshoot
N/A
120Hz First Response Heatmap
120Hz Total Response Heatmap
120Hz Heatmap RGB Overshoot
CAD @ 60Hz
4.8
Pursuit Photo 60Hz
CAD Heatmap 60Hz
OD Transition 60Hz
OD extreme
0 to 31
Recommended Overdrive Setting
Normal
Avg. CAD
373
Best 10% CAD
215
Worst 10% CAD
583
Response Time @ 60Hz
Recommended Overdrive Setting
Normal
Normal
First Response Time
6.8 ms
15.2 ms
Total Response Time
13.5 ms
15.2 ms
RGB Overshoot
1.3%
0 RGB
Worst 10% Total Response Time
14.7 ms
25.0 ms
Worst 10% First Response Time
7.4 ms
25.0 ms
Worst 10% RGB Overshoot
2.8%
0 RGB
60Hz First Response Heatmap
60Hz Total Response Heatmap
60Hz RGB Overshoot Heatmap
Backlight Strobing (BFI)
Backlight Strobing Picture
Backlight Strobing Frequency Picture
Backlight Strobing (BFI)
No BFI
No BFI
Maximum Frequency
N/A
N/A
Minimum Frequency
N/A
N/A
Longest Pulse Width Brightness
N/A
Shortest Pulse Width Brightness
N/A
Pulse Width Control
No BFI
Pulse Phase Control
No BFI
Pulse Amplitude Control
No BFI
VRR At The Same Time
No BFI
VRR Flicker
9.4
VRR Flicker Video
VRR Flicker Graph
Dark Gray Flicker
0.5 RGB
Middle Gray Flicker
0.3 RGB
Light Gray Flicker
0.1 RGB
Image Flicker
10
10
Backlight Picture
Flicker-Free
Yes
Yes
PWM Dimming Frequency
0 Hz
0 Hz
Response Time @ 60Hz
8.3
Motion Blur Picture
Response Time Table
Best Overdrive Setting
Normal
Normal
Rise / Fall Time
6.8 ms
15.2 ms
Total Response Time
13.5 ms
15.2 ms
Overshoot Error
1.3%
0 RGB
Dark Rise / Fall Time
7.4 ms
25.0 ms
Dark Total Response Time
14.7 ms
25.0 ms
Dark Overshoot Error
2.8%
0 RGB
Inputs
Input Lag
9.0
8.3
Native Resolution @ Max Hz
8.8 ms
8.7 ms
Native Resolution @ 120Hz
N/A
Native Resolution @ 60Hz
8.8 ms
8.7 ms
Variable Refresh Rate
9.2 ms
Variable Refresh Rate @ 60Hz
9.4 ms
10 Bit HDR
8.9 ms
Backlight Strobing (BFI)
N/A
N/A
Resolution
9.2
8.8
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
163 PPI
Screen Diagonal
26.9"
Screen Area
310 in²
PS5 Compatibility
2.3
PS5 Compatibility Photo
PS5 Compatibility Table
4k @ 120Hz
No
4k @ 60Hz
Yes
1440p @ 120Hz
No
1440p @ 60Hz
Yes
1080p @ 120Hz
No
1080p @ 60Hz
Yes
Xbox Series X|S Compatibility
3.9
XSX Compatibility Photo
XSX Compatibility Table
4k @ 120Hz
No
4k @ 60Hz
Yes
1440p @ 120Hz
No
1440p @ 60Hz
Yes
1080p @ 120Hz
No
1080p @ 60Hz
Yes
Inputs Photos
Inputs 1
Inputs 2
Video And Audio Ports
DisplayPort
1 (DP 1.2)
1 (DP 1.2)
DisplayPort Transmission Bandwidth
No DisplayPort 2.1
Mini DisplayPort
No
No
HDMI
2 (HDMI 2.0)
2 (HDMI 2.0)
HDMI 2.1 Bandwidth
No HDMI 2.1
DVI
No
No
VGA
No
No
Daisy Chaining
No
3.5mm Audio Out
1
1
3.5mm Audio In
No
3.5mm Microphone In
No
No
DisplayPort Out
No
USB
No
0
USB C
No
0
Digital Optical Audio Out
No
Analog Audio Out RCA
No
Power Supply
External Brick
Internal
USB
USB-A Ports
No
0
USB-A Rated Speed
No USB-A Ports
USB-B Upstream Port
No
USB-C Ports
No
0
USB-C Upstream
No USB-C Ports
USB-C Rated Speed
No USB-C Ports
USB-C Power Delivery
No USB-C Ports
USB-C DisplayPort Alt Mode
No USB-C Ports
Thunderbolt
No
macOS Compatibility
macOS Screenshot
Features
Additional Features
HDR10
Yes
Yes
Speakers
No
Yes
RGB Illumination
No
No
Multiple Input Display
No
PIP + PBP
KVM Switch
No
On-Screen Display (OSD)
OSD Picture
Controls
Controls Picture
In The Box
In The Box Picture
Check Price
27"
27UK650-W
SEE PRICE
Amazon.com
27"
S2721QS
SEE PRICE
Amazon.com
27"
27UK650-W
SEE PRICE
Walmart.com
27"
S2721QS
SEE PRICE
Walmart.com
27"
27UK650-W
SEARCH
B&H
27"
S2721QS
SEARCH
B&H
27"
27UK650-W
SEARCH
BestBuy.com
27"
S2721QS
SEARCH
BestBuy.com
27"
27UK650-W
SEARCH
LG.com
LG 27UK650-W
Dell S2721QS
Comments
LG 27UK650-W vs Dell S2721QS: Main Discussion
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