Products
LG 27GP850-B/27GP83B-B
Samsung Odyssey G55A S27AG55
Tested using Methodology v2.1.1
Updated Nov 07, 2025 02:23 PM
SEE PRICE
Amazon.com
Tested using Methodology v2.0.1
Updated Aug 11, 2025 03:35 PM
SEE PRICE
Amazon.com
Max Refresh Rate
180 Hz
Size
27"
Pixel Type
IPS
Native Resolution
2560 x 1440
Max Refresh Rate
165 Hz
Size
27"
Pixel Type
VA
Native Resolution
2560 x 1440
Our Verdict
LG 27GP850-B/27GP83B-B
Samsung Odyssey G55A S27AG55
The LG 27GP850-B/27GP83B-B is significantly better than the Samsung Odyssey G55A S27AG55. The LG has much better ergonomics, so it's easier to place it in an ideal viewing position. The LG also has much better gaming performance, with a significantly faster response time, so motion looks sharper overall, with less blur behind fast-moving objects. The LG also gets brighter and has a wider viewing angle, so the image remains accurate to the sides if you're sitting close to the screen.
Variants
- 27GP850-B (27")
- 27GP83B-B (27")
- LS27AG550ENXZA (27")
Check Price
27"
27GP850-B
SEE PRICE
Amazon.com
27"
LS27AG550ENXZA
SEE PRICE
Amazon.com
27"
27GP83B-B
SEE PRICE
LG.com
27"
LS27AG550ENXZA
SEE PRICE
Walmart.com
27"
LS27AG550ENXZA
SEE PRICE
BestBuy.com
27"
LS27AG550ENXZA
SEARCH
B&H
27"
LS27AG550ENXZA
SEARCH
Samsung.com
Main Differences for
PC Gaming
PC Gaming
Threshold
PC Gaming
7.2
6.4
VRR Motion Performance
8.2
4.3
Refresh Rate Compliance
7.9
5.3
CAD @ Max Refresh Rate
8.2
5.7
CAD @ 120Hz
8.0
5.5
Contrast
5.6
7.6
CAD @ 60Hz
8.0
5.4
Full Comparison
Design
Style
Design Picture
Curved
No
Yes
Curve Radius
Not Curved
1000R
Accelerated Longevity Test
Uniformity Pictures
Longevity Graph
Build Quality
7.0
7.0
Build Quality Picture
Ergonomics
7.5
4.1
Ergonomics Picture
Back Picture
Height Adjustment
4.3" (11.0 cm)
0.0" (0.0 cm)
Min Height To Top Of Panel
18.0" (45.8 cm)
18.1" (45.9 cm)
Tilt Range
-15° to 5°
-17.5° to 2.5°
Rotate Portrait/Landscape
Yes, Clockwise
No
Swivel Range
No swivel
No swivel
Wall Mount
VESA 100x100
VESA 75x75
Stand
Stand Picture
Thickness Picture
Base Width
16.7" (42.5 cm)
21.7" (55.0 cm)
Base Depth
11.5" (29.3 cm)
10.9" (27.6 cm)
Thickness (With Display)
8.9" (22.6 cm)
9.1" (23.0 cm)
Weight (With Display)
13.7 lbs (6.2 kg)
9.9 lbs (4.5 kg)
Display
Display Picture
Size
27"
27"
Housing Width
24.2" (61.5 cm)
24.2" (61.5 cm)
Housing Height
14.4" (36.5 cm)
15.0" (38.2 cm)
Thickness (Without Stand)
2.0" (5.1 cm)
4.1" (10.5 cm)
Weight (Without Stand)
9.0 lbs (4.1 kg)
9.0 lbs (4.1 kg)
Borders Size (Bezels)
0.3" (0.8 cm)
0.4" (1.0 cm)
Controls
Controls Picture
In The Box
In The Box Picture
Power Supply
External Brick
External Brick
Picture Quality
Contrast
5.6
7.6
Checkerboard Picture
Native Contrast
807 : 1
2,521 : 1
Contrast With Local Dimming
N/A
N/A
Local Dimming
0.0
0.0
Local Dimming Video
Local Dimming
No
No
Backlight
Edge
Edge
SDR Brightness
8.0
6.8
Real Scene
349 cd/m²
245 cd/m²
Peak 2% Window
364 cd/m²
238 cd/m²
Peak 10% Window
364 cd/m²
257 cd/m²
Peak 25% Window
365 cd/m²
257 cd/m²
Peak 50% Window
365 cd/m²
257 cd/m²
Peak 100% Window
365 cd/m²
257 cd/m²
Sustained 2% Window
364 cd/m²
237 cd/m²
Sustained 10% Window
364 cd/m²
256 cd/m²
Sustained 25% Window
364 cd/m²
257 cd/m²
Sustained 50% Window
365 cd/m²
257 cd/m²
Sustained 100% Window
365 cd/m²
257 cd/m²
Automatic Brightness Limiting (ABL)
0.000
0.005
Minimum Brightness
22 cd/m²
50 cd/m²
HDR Brightness
7.1
6.0
EOTF
VESA DisplayHDR Certification
DisplayHDR 400 - 1.0/1.1
No Certification
Real Scene
465 cd/m²
293 cd/m²
Peak 2% Window
471 cd/m²
283 cd/m²
Peak 10% Window
472 cd/m²
306 cd/m²
Peak 25% Window
473 cd/m²
306 cd/m²
Peak 50% Window
473 cd/m²
306 cd/m²
Peak 100% Window
472 cd/m²
306 cd/m²
Sustained 2% Window
470 cd/m²
283 cd/m²
Sustained 10% Window
471 cd/m²
306 cd/m²
Sustained 25% Window
472 cd/m²
306 cd/m²
Sustained 50% Window
472 cd/m²
306 cd/m²
Sustained 100% Window
472 cd/m²
306 cd/m²
Automatic Brightness Limiting (ABL)
0.000
0.005
Gray Uniformity
8.0
8.3
50% Uniformity Picture
50% Std. Dev.
2.607%
2.082%
50% DSE
0.147%
0.137%
Black Uniformity
5.7
5.5
Native Black Uniformity Picture
Native Std. Dev.
2.189%
2.324%
Black Uniformity Picture With Local Dimming
Std. Dev. w/ L.D.
N/A
N/A
Vertical Viewing Angle
4.7
Vertical Viewing Angle Video
Vertical Chroma Graph
Color Washout From Below
24°
Color Washout From Above
26°
Vertical Hue Graph
Color Shift From Below
28°
Color Shift From Above
24°
Vertical Lightness Graph
Brightness Loss From Below
28°
Brightness Loss From Above
29°
Black Level Raise From Below
6°
Black Level Raise From Above
6°
Gamma Shift From Below
13°
Gamma Shift From Above
12°
Color Accuracy (Pre-Calibration)
8.5
8.1
Pre Calibration Picture
Pre Gamma Curve Picture
Pre Color Picture
Picture Mode
sRGB
Custom
sRGB Gamut Area xy
101.4%
104.1%
White Balance dE (Avg.)
3.35
3.72
Color Temperature (Avg.)
5,950 K
7,103 K
Gamma (Avg.)
2.05
2.20
Color dE (Avg.)
2.54
2.76
Contrast Setting
70
75
RGB Settings
Default
50-50-50
Gamma Setting
Default
Mode 1
Brightness Setting
22
75
Measured Brightness
119 cd/m²
182 cd/m²
Brightness Locked
No
No
Color Accuracy (Post-Calibration)
9.7
9.5
Post Calibration Picture
Post Gamma Curve Picture
Post Color Picture
Picture Mode
Gamer 1
Custom
sRGB Gamut Area xy
101.3%
96.9%
White Balance dE (Avg.)
0.64
0.41
Color Temperature (Avg.)
6,499 K
6,507 K
Gamma (Avg.)
2.18
2.20
Color dE (Avg.)
0.37
0.68
Contrast Setting
68
70
RGB Settings
50-50-47
50-44-44
Gamma Setting
Mode 2
Mode 1
Brightness Setting
21
22
Measured Brightness
99 cd/m²
101 cd/m²
SDR Color Gamut
9.6
8.9
sRGB Color Gamut Picture
sRGB Coverage xy
99.9%
96.8%
sRGB Picture Mode
Gamer 1
Custom
Adobe RGB Color Gamut Picture
Adobe RGB Coverage xy
88.1%
76.1%
Adobe RGB Picture Mode
Gamer 1
Custom
HDR Color Gamut
8.8
6.2
Wide Color Gamut
Yes
No
DCI-P3 Color Gamut Picture
DCI-P3 Coverage xy
95.6%
77.3%
DCI-P3 Picture Mode
Gamer 1
HDR On
Rec. 2020 Color Gamut Picture
Rec. 2020 Coverage xy
70.4%
55.5%
Rec. 2020 Picture Mode
Gamer 1
HDR On
HDR Color Volume
7.4
6.1
DCI-P3 Color Volume ITP Picture
1,000 cd/m² DCI-P3 Coverage ICtCp
64.8%
46.7%
DCI-P3 Picture Mode
Gamer 1
HDR On
Rec. 2020 Color Volume ITP Picture
10,000 cd/m² Rec. 2020 Coverage ICtCp
29.1%
19.9%
Rec. 2020 Picture Mode
Gamer 1
HDR On
Viewing Angle
8.4
5.3
Viewing Angle Video
Chroma Graph
Color Washout From Left
45°
30°
Color Washout From Right
45°
27°
Hue Graph
Color Shift From Left
52°
40°
Color Shift From Right
53°
41°
Lightness Graph
Brightness Loss From Left
48°
31°
Brightness Loss From Right
49°
28°
Black Level Raise From Left
70°
12°
Black Level Raise From Right
70°
11°
Gamma Shift From Left
58°
14°
Gamma Shift From Right
57°
12°
Text Clarity
7.5
7.5
ClearType On
ClearType Off
Pixel Type
IPS
VA
Pixels
Subpixel Layout
RGB
RGB
Direct Reflections
6.5
Ring Light Picture
Direct Reflections Graph
Peak Direct Reflection Intensity
30.7%
Screen Finish
Matte
Matte
Reflections
7.5
Average Room
Average Room Off Picture
Bright Room Off Picture
Screen Finish
Matte
Matte
Total Reflections
5.3%
Indirect Reflections
3.1%
Calculated Direct Reflections
2.2%
Ambient Black Level Raise
8.4
Black Level Raise Picture
Ambient Black Level Raise Graph
Black Luminance @ 0 lx
0.43 cd/m²
Black Luminance @ 1000 lx
0.73 cd/m²
Total Reflected Light
5.9
Bright Room Off Picture
Total Reflection Ring Light Picture
Total Reflected Light Intensity
32,808% ⋅ pixel
Diffraction Artifacts
No
Gradient
9.6
9.8
Gradient Picture
Color Depth
10 Bit
10 Bit
Motion
Refresh Rate
7.7
7.5
Native Refresh Rate
165 Hz
165 Hz
Max Refresh Rate
180 Hz
165 Hz
Max Refresh Rate Over DP
180 Hz
165 Hz
Max Refresh Rate Over HDMI
144 Hz
144 Hz
Max Refresh Rate Over DP @ 10-bit
180 Hz
165 Hz
Max Refresh Rate Over HDMI @ 10-Bit
60 Hz
60 Hz
DSC Toggle
No
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
Yes
FreeSync
Yes
Yes
G-SYNC
Compatible (NVIDIA Certified)
Compatible (Tested)
VRR Maximum
180 Hz
165 Hz
VRR Minimum
< 20 Hz
< 20 Hz
VRR Supported Connectors
DisplayPort, HDMI
DisplayPort, HDMI
VRR Motion Performance
8.2
4.3
Pursuit Photo VRR
OD Mode CAD Comparison
Recommended VRR OD Setting
Normal
FreeSync Premium
Variable Overdrive Advertised
No
No
Avg. CAD
151
449
Best CAD
150
412
Worst CAD
152
506
Refresh Rate Compliance
7.9
5.3
Fast GTG Sequence
VRR Compliance
Compliance @ Max Hz
52%
34%
Compliance @ 120 FPS
65%
45%
Compliance @ 60 FPS
82%
59%
CAD @ Max Refresh Rate
8.2
5.7
Pursuit Photo At Max Refresh
CAD Heatmap At Max Refresh
OD Transition Max Refresh Rate
OD fast
0 to 31
OD faster
0 to 31
Recommended Overdrive Setting
Fast
Fastest
Avg. CAD
131
256
Best 10% CAD
66
83
Worst 10% CAD
221
653
Response Time @ Max Refresh Rate
First Response Time
4.7 ms
8.8 ms
Total Response Time
5.5 ms
11.9 ms
Recommended Overdrive Setting
Fast
Fastest
RGB Overshoot
1 RGB
7 RGB
Worst 10% RGB Overshoot
6 RGB
43 RGB
Worst 10% First Response Time
9.7 ms
26.4 ms
Worst 10% Total Response Time
9.7 ms
26.4 ms
Heatmap First Response
Heatmap Total Response
Heatmap RGB Overshoot
CAD @ 120Hz
8.0
5.5
Pursuit Photo 120Hz
CAD Heatmap 120Hz
OD Transition 120Hz
OD fast
0 to 31
OD faster
0 to 31
Recommended Overdrive Setting
Fast
Fastest
Avg. CAD
142
286
Best 10% CAD
88
86
Worst 10% CAD
211
633
Response Time @ 120Hz
Worst 10% First Response Time
6.8 ms
31.8 ms
RGB Overshoot
7 RGB
2 RGB
Total Response Time
9.6 ms
14.2 ms
First Response Time
4.2 ms
12.5 ms
Recommended Overdrive Setting
Fast
Fastest
Worst 10% Total Response Time
11.7 ms
31.8 ms
Worst 10% RGB Overshoot
10 RGB
15 RGB
120Hz First Response Heatmap
120Hz Total Response Heatmap
120Hz Heatmap RGB Overshoot
CAD @ 60Hz
8.0
5.4
Pursuit Photo 60Hz
CAD Heatmap 60Hz
OD Transition 60Hz
OD fast
0 to 31
OD faster
0 to 31
Recommended Overdrive Setting
Normal
Fastest
Avg. CAD
147
314
Best 10% CAD
79
92
Worst 10% CAD
227
612
Response Time @ 60Hz
Recommended Overdrive Setting
Normal
Fastest
First Response Time
5.6 ms
14.6 ms
Total Response Time
6.7 ms
16.9 ms
RGB Overshoot
1 RGB
1 RGB
Worst 10% Total Response Time
17.6 ms
30.9 ms
Worst 10% First Response Time
8.3 ms
30.9 ms
Worst 10% RGB Overshoot
6 RGB
9 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)
Yes
Yes
Maximum Frequency
165 Hz
165 Hz
Minimum Frequency
120 Hz
165 Hz
Longest Pulse Width Brightness
136 cd/m²
114 cd/m²
Shortest Pulse Width Brightness
136 cd/m²
114 cd/m²
Pulse Width Control
No
No
Pulse Phase Control
No
No
Pulse Amplitude Control
Yes
No
VRR At The Same Time
No
No
VRR Flicker
8.2
2.4
VRR Flicker Video
VRR Flicker Graph
Dark Gray Flicker
1.0 RGB
5.9 RGB
Middle Gray Flicker
1.8 RGB
5.1 RGB
Light Gray Flicker
1.8 RGB
4.3 RGB
Image Flicker
10
10
Backlight Picture
Flicker-Free
Yes
Yes
PWM Dimming Frequency
0 Hz
>1000 Hz
Inputs
Input Lag
9.0
8.7
Native Resolution @ Max Hz
3.6 ms
4.9 ms
Native Resolution @ 120Hz
4.9 ms
6.1 ms
Native Resolution @ 60Hz
9.1 ms
10.4 ms
Backlight Strobing (BFI)
4.4 ms
7.1 ms
Resolution
7.5
7.5
Native Resolution
2560 x 1440
2560 x 1440
Aspect Ratio
16:9
16:9
Megapixels
3.7 MP
3.7 MP
Pixel Density
109 PPI
109 PPI
PS5 Compatibility
4.9
4.9
PS5 Compatibility Photo
PS5 Compatibility Table
4k @ 120Hz
No
No
4k @ 60Hz
Yes
Yes
1440p @ 120Hz
Yes
Yes
1440p @ 60Hz
Yes
Yes
1080p @ 120Hz
Yes
Yes
1080p @ 60Hz
Yes
Yes
Xbox Series X|S Compatibility
7.1
6.6
XSX Compatibility Photo
XSX Compatibility Table
4k @ 120Hz
No
No
4k @ 60Hz
Yes
Yes
1440p @ 120Hz
Yes
Yes
1440p @ 60Hz
Yes
Yes
1080p @ 120Hz
Yes
Yes
1080p @ 60Hz
Yes
Yes
Inputs Photos
Inputs 1
Inputs 2
Inputs
Inputs 1
Inputs 2
DisplayPort
1 (DP 1.4)
1 (DP 1.4)
DisplayPort Transmission Bandwidth
No DisplayPort 2.1
No DisplayPort 2.1
Mini DisplayPort
No
No
DVI
No
HDMI
2 (HDMI 2.0)
1 (HDMI 2.0)
VGA
No
HDMI 2.1 Bandwidth
No HDMI 2.1
No HDMI 2.1
Daisy Chaining
No
No
3.5mm Audio Out
Yes
1
3.5mm Audio In
No
3.5mm Microphone In
No
Ethernet
No
HDR10
Yes
Yes
Dolby Vision
No
USB
USB-A Ports
2
1 (Service Port Only)
USB-A Rated Speed
5Gbps (USB 3.2 Gen 1)
480Mbps (USB 2.0)
USB-B Upstream Port
Yes
No
USB-C Ports
0
0
USB-C Upstream
No USB-C Ports
No USB-C Ports
USB-C Rated Speed
No USB-C Ports
No USB-C Ports
USB-C Power Delivery
No USB-C Ports
No USB-C Ports
USB-C DisplayPort Alt Mode
No USB-C Ports
No USB-C Ports
Thunderbolt
No
No
macOS Compatibility
macOS Screenshot
Features
Additional Features
Speakers
No
No
HDR10
Yes
Yes
RGB Illumination
No
No
Multiple Input Display
No
No
KVM Switch
No
No
Smart OS
No
On-Screen Display (OSD)
OSD Picture
Check Price
27"
27GP850-B
SEE PRICE
Amazon.com
27"
LS27AG550ENXZA
SEE PRICE
Amazon.com
27"
27GP83B-B
SEE PRICE
LG.com
27"
LS27AG550ENXZA
SEE PRICE
Walmart.com
27"
LS27AG550ENXZA
SEE PRICE
BestBuy.com
27"
LS27AG550ENXZA
SEARCH
B&H
27"
LS27AG550ENXZA
SEARCH
Samsung.com
LG 27GP850-B/27GP83B-B
Samsung Odyssey G55A S27AG55
Comments
LG 27GP850-B/27GP83B-B vs Samsung Odyssey G55A S27AG55: Main Discussion
What do you think of these products? Let us know below.
Looking for a personalized buying advice from the RTINGS.com experts? Insiders have direct access to buying advice on our insider forum.