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- Table of Contents
- Top
- Main Differences
- Design
- Picture Quality
- Motion
- Inputs
- Features
- Comments
Gigabyte G27QC vs Samsung Odyssey G55A S27AG55
Side-by-Side Comparison
Products
Gigabyte G27QC
Samsung Odyssey G55A S27AG55
Tested using Methodology v1.1
Updated Feb 23, 2024 07:25 PM
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Amazon.comTested using Methodology v2.0.1
Updated Feb 19, 2025 04:47 PM
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Max Refresh Rate165 Hz
Size27"
Pixel TypeVA
Native Resolution2560 x 1440
Variable Refresh RateFreeSync
Max Refresh Rate165 Hz
Size27"
Pixel TypeVA
Native Resolution2560 x 1440
Variable Refresh RateYes
Variants
- G27QC (27")
- LS27AG550ENXZA (27")
Our Verdict
Gigabyte G27QC
Samsung Odyssey G55A S27AG55
The Gigabyte G27QC is much better than the Samsung Odyssey G5/G55A S27AG55. The Gigabyte has better ergonomics, so it's easier to place it in an ideal viewing position. The Gigabyte also has a significantly faster response time, so motion looks clearer with less blur behind fast-moving objects. Finally, the Gigabyte also gets a bit brighter, so it looks better in a bright room.
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27"
G27QC
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Amazon.com27"
LS27AG550ENXZA
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Amazon.com27"
G27QC
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Amazon.com27"
LS27AG550ENXZA
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Amazon.com27"
G27QC
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Amazon.com27"
G27QC
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Amazon.com27"
G27QC
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G27QC
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G27QC
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G27QC
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G27QC
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G27QC
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Amazon.comNotice:
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
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Main Differences forMixed Usage
Mixed Usage
Threshold
Mixed Usage
7.6
Full Comparison
Design
Style
Design Picture
Curved
Yes
Yes
Curve Radius
1500R
1000R
Size
27"
27"
Weight (without stand)
10.1 lbs (4.6 kg)
9.0 lbs (4.1 kg)
Weight (with stand)
14.6 lbs (6.6 kg)
9.9 lbs (4.5 kg)
Accelerated Longevity Test
Uniformity Pictures
Longevity Graph
Build Quality
7.5
7.0
Build Quality Picture
Ergonomics
5.3
1.7
Ergonomics Picture
Back Picture
Height Adjustment
5.1" (13.0 cm)
0.0" (0.0 cm)
Min Height To Top Of Panel
N/A
Tilt Range
-20° to 5°
-17.5° to 2.5°
Rotate Portrait/Landscape
No
No
Swivel Range
No swivel
No swivel
Wall Mount
VESA 100x100
VESA 75x75
Stand
Stand Picture
Thickness Picture
Base Width
15.7" (40.0 cm)
21.7" (55.0 cm)
Base Depth
7.3" (18.6 cm)
10.9" (27.6 cm)
Thickness (With Display)
6.5" (16.5 cm)
9.1" (23.0 cm)
Weight (With Display)
14.6 lbs (6.6 kg)
9.9 lbs (4.5 kg)
Display
Display Picture
Size
27"
27"
Housing Width
24.2" (61.5 cm)
Housing Height
15.0" (38.2 cm)
Thickness (Without Stand)
3.6" (9.1 cm)
4.1" (10.5 cm)
Weight (Without Stand)
10.1 lbs (4.6 kg)
9.0 lbs (4.1 kg)
Borders Size (Bezels)
0.3" (0.7 cm)
0.4" (1.0 cm)
Controls
Controls Picture
In The Box
In The Box Picture
Power Supply
Internal
External Brick
Back
Back Picture
Wall Mount
VESA 100x100
VESA 75x75
Borders
Borders Picture
Borders
0.3" (0.7 cm)
0.4" (1.0 cm)
Thickness
Thickness Picture
Thickness (with stand)
6.5" (16.5 cm)
9.1" (23.0 cm)
Thickness (without stand)
3.6" (9.1 cm)
4.1" (10.5 cm)
Picture Quality
Contrast
8.3
7.6
Checkerboard Picture
Native Contrast
3,855 : 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
7.8
6.8
Real Scene
376 cd/m²
245 cd/m²
Peak 2% Window
285 cd/m²
238 cd/m²
Peak 10% Window
286 cd/m²
257 cd/m²
Peak 25% Window
286 cd/m²
257 cd/m²
Peak 50% Window
286 cd/m²
257 cd/m²
Peak 100% Window
286 cd/m²
257 cd/m²
Sustained 2% Window
285 cd/m²
237 cd/m²
Sustained 10% Window
286 cd/m²
256 cd/m²
Sustained 25% Window
286 cd/m²
257 cd/m²
Sustained 50% Window
286 cd/m²
257 cd/m²
Sustained 100% Window
286 cd/m²
257 cd/m²
Automatic Brightness Limiting (ABL)
0.000
0.005
Minimum Brightness
50 cd/m²
HDR Brightness
6.4
6.0
EOTF
VESA DisplayHDR Certification
No Certification
Real Scene
388 cd/m²
293 cd/m²
Peak 2% Window
284 cd/m²
283 cd/m²
Peak 10% Window
286 cd/m²
306 cd/m²
Peak 25% Window
287 cd/m²
306 cd/m²
Peak 50% Window
287 cd/m²
306 cd/m²
Peak 100% Window
287 cd/m²
306 cd/m²
Sustained 2% Window
284 cd/m²
283 cd/m²
Sustained 10% Window
286 cd/m²
306 cd/m²
Sustained 25% Window
287 cd/m²
306 cd/m²
Sustained 50% Window
287 cd/m²
306 cd/m²
Sustained 100% Window
287 cd/m²
306 cd/m²
Automatic Brightness Limiting (ABL)
0.000
0.005
Horizontal Viewing Angle
5.5
5.3
Horizontal Viewing Angle Video
Horizontal Chroma Graph
Color Washout From Left
24°
30°
Color Washout From Right
26°
27°
Horizontal Hue Graph
Color Shift From Left
44°
40°
Color Shift From Right
43°
41°
Horizontal Lightness Graph
Brightness Loss From Left
27°
31°
Brightness Loss From Right
29°
28°
Black Level Raise From Left
14°
12°
Black Level Raise From Right
18°
11°
Gamma Shift From Left
14°
14°
Gamma Shift From Right
20°
12°
Vertical Viewing Angle
5.2
4.7
Vertical Viewing Angle Video
Vertical Chroma Graph
Color Washout From Below
25°
24°
Color Washout From Above
29°
26°
Vertical Hue Graph
Color Shift From Below
38°
28°
Color Shift From Above
46°
24°
Vertical Lightness Graph
Brightness Loss From Below
27°
28°
Brightness Loss From Above
31°
29°
Black Level Raise From Below
10°
6°
Black Level Raise From Above
13°
6°
Gamma Shift From Below
9°
13°
Gamma Shift From Above
11°
12°
Gray Uniformity
8.7
8.3
50% Uniformity Picture
50% Std. Dev.
2.968%
2.082%
50% DSE
0.100%
0.137%
5% Uniformity Picture
5% Std. Dev.
1.000%
5% DSE
0.082%
Black Uniformity
3.2
5.5
Native Black Uniformity Picture
Native Std. Dev.
3.895%
2.324%
Black Uniformity Picture With Local Dimming
Std. Dev. w/ L.D.
N/A
N/A
Color Accuracy (Pre-Calibration)
7.7
8.1
Pre Calibration Picture
Pre Gamma Curve Picture
Pre Color Picture
Picture Mode
sRGB
Custom
sRGB Gamut Area xy
104.1%
White Balance dE (Avg.)
2.75
3.72
Color Temperature (Avg.)
6,265 K
7,103 K
Gamma (Avg.)
2.19
2.20
Color dE (Avg.)
2.94
2.76
Contrast Setting
N/A
75
RGB Settings
Default
50-50-50
Gamma Setting
Default
Mode 1
Brightness Setting
35
75
Measured Brightness
156 cd/m²
182 cd/m²
Brightness Locked
No
Color Accuracy (Post-Calibration)
9.5
9.5
Post Calibration Picture
Post Gamma Curve Picture
Post Color Picture
Picture Mode
Custom 1
Custom
sRGB Gamut Area xy
96.9%
White Balance dE (Avg.)
0.57
0.41
Color Temperature (Avg.)
6,566 K
6,507 K
Gamma (Avg.)
2.19
2.20
Color dE (Avg.)
0.89
0.68
Contrast Setting
50
70
RGB Settings
94-98-100
50-44-44
Gamma Setting
Gamma 3
Mode 1
Brightness Setting
14
22
Measured Brightness
100 cd/m²
101 cd/m²
ICC Profile
SDR Color Gamut
8.9
8.9
sRGB Color Gamut Picture
sRGB Coverage xy
97.2%
96.8%
sRGB Picture Mode
Custom 1
Custom
Adobe RGB Color Gamut Picture
Adobe RGB Coverage xy
81.2%
76.1%
Adobe RGB Picture Mode
Custom 1
Custom
HDR Color Gamut
7.0
6.2
Wide Color Gamut
Yes
No
DCI-P3 Color Gamut Picture
DCI-P3 Coverage xy
77.3%
DCI-P3 Picture Mode
Custom 1
HDR On
Rec. 2020 Color Gamut Picture
Rec. 2020 Coverage xy
63.1%
55.5%
Rec. 2020 Picture Mode
Custom 1
HDR On
DCI P3 xy
77.0%
HDR Color Volume
7.3
6.1
DCI-P3 Color Volume ITP Picture
1,000 cd/m² DCI-P3 Coverage ICtCp
83.9%
46.7%
DCI-P3 Picture Mode
Custom 1
HDR On
Rec. 2020 Color Volume ITP Picture
10,000 cd/m² Rec. 2020 Coverage ICtCp
61.4%
19.9%
Rec. 2020 Picture Mode
Custom 1
HDR On
Text Clarity
7.5
7.5
ClearType On
ClearType Off
Pixel Type
VA
VA
Pixels
Subpixel Layout
RGB
RGB
Reflections
7.9
7.5
Average Room
Average Room Off Picture
Bright Room Off Picture
Screen Finish
Matte
Matte
Total Reflections
5.3%
5.3%
Indirect Reflections
4.4%
3.1%
Calculated Direct Reflections
0.9%
2.2%
Gradient
9.7
9.8
Gradient Picture
Color Depth
10 Bit
10 Bit
SDR Color Volume
9.4
sRGB Color Volume ITP Picture
sRGB In ICtCp
98.9%
Adobe RGB Color Volume ITP Picture
Adobe RGB In ICtCp
88.6%
sRGB Picture Mode
Custom 1
Adobe RGB Picture Mode
Custom 1
Image Retention
9.9
Image Retention Picture
IR After 0 Min Recovery
0.05%
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
0.001%
Color Bleed Vertical
Pixel Column Error
0.001%
Motion
Refresh Rate
7.5
Native Refresh Rate
165 Hz
165 Hz
Max Refresh Rate
165 Hz
165 Hz
Max Refresh Rate Over DP
165 Hz
Max Refresh Rate Over HDMI
144 Hz
Max Refresh Rate Over DP @ 10-bit
165 Hz
Max Refresh Rate Over HDMI @ 10-Bit
60 Hz
Variable Refresh Rate (VRR)
Variable Refresh Rate
FreeSync
Yes
FreeSync
Yes
Yes
G-SYNC
Compatible (Tested)
Compatible (Tested)
VRR Maximum
165 Hz
165 Hz
VRR Minimum
< 20 Hz
< 20 Hz
VRR Supported Connectors
DisplayPort, HDMI
DisplayPort, HDMI
Native
165 Hz
165 Hz
Max Refresh Rate
165 Hz
165 Hz
Variable Refresh Rate
Yes
VRR Motion Performance
4.3
Pursuit Photo VRR
OD Mode CAD Comparison
Recommended VRR OD Setting
FreeSync Premium
Variable Overdrive Advertised
No
Avg. CAD
449
Best CAD
412
Worst CAD
506
Refresh Rate Compliance
5.3
Fast GTG Sequence
VRR Compliance
Compliance @ Max Hz
34%
Compliance @ 120 FPS
45%
Compliance @ 60 FPS
59%
CAD @ Max Refresh Rate
5.7
Pursuit Photo At Max Refresh
CAD Heatmap At Max Refresh
OD Transition Max Refresh Rate
OD faster
0 to 31
Recommended Overdrive Setting
Fastest
Avg. CAD
256
Best 10% CAD
83
Worst 10% CAD
653
Response Time @ Max Refresh Rate
First Response Time
5.2 ms
8.8 ms
Total Response Time
12.2 ms
11.9 ms
Recommended Overdrive Setting
Speed
Fastest
RGB Overshoot
7.9%
7 RGB
Worst 10% RGB Overshoot
2.0%
43 RGB
Worst 10% First Response Time
10.5 ms
26.4 ms
Worst 10% Total Response Time
18.8 ms
26.4 ms
Heatmap First Response
Heatmap Total Response
Heatmap RGB Overshoot
Motion Blur Picture
Response Time Table
CAD @ 120Hz
5.5
Pursuit Photo 120Hz
CAD Heatmap 120Hz
OD Transition 120Hz
OD faster
0 to 31
Recommended Overdrive Setting
Fastest
Avg. CAD
286
Best 10% CAD
86
Worst 10% CAD
633
Response Time @ 120Hz
Worst 10% First Response Time
31.8 ms
RGB Overshoot
2 RGB
Total Response Time
14.2 ms
First Response Time
12.5 ms
Recommended Overdrive Setting
Fastest
Worst 10% Total Response Time
31.8 ms
Worst 10% RGB Overshoot
15 RGB
120Hz First Response Heatmap
120Hz Total Response Heatmap
120Hz Heatmap RGB Overshoot
CAD @ 60Hz
5.4
Pursuit Photo 60Hz
CAD Heatmap 60Hz
OD Transition 60Hz
OD faster
0 to 31
Recommended Overdrive Setting
Fastest
Avg. CAD
314
Best 10% CAD
92
Worst 10% CAD
612
Response Time @ 60Hz
Recommended Overdrive Setting
Balance
Fastest
First Response Time
5.6 ms
14.6 ms
Total Response Time
15.5 ms
16.9 ms
RGB Overshoot
3.5%
1 RGB
Worst 10% Total Response Time
20.3 ms
30.9 ms
Worst 10% First Response Time
7.5 ms
30.9 ms
Worst 10% RGB Overshoot
4.5%
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
100 Hz
165 Hz
Longest Pulse Width Brightness
114 cd/m²
Shortest Pulse Width Brightness
114 cd/m²
Pulse Width Control
No
Pulse Phase Control
No
Pulse Amplitude Control
No
VRR At The Same Time
No
VRR Flicker
2.4
VRR Flicker Video
VRR Flicker Graph
Dark Gray Flicker
5.9 RGB
Middle Gray Flicker
5.1 RGB
Light Gray Flicker
4.3 RGB
Image Flicker
10
10
Backlight Picture
Flicker-Free
Yes
Yes
PWM Dimming Frequency
0 Hz
>1000 Hz
Response Time @ 60Hz
8.0
Motion Blur Picture
Response Time Table
Best Overdrive Setting
Balance
Fastest
Rise / Fall Time
5.6 ms
14.6 ms
Total Response Time
15.5 ms
16.9 ms
Overshoot Error
3.5%
1 RGB
Dark Rise / Fall Time
7.5 ms
30.9 ms
Dark Total Response Time
20.3 ms
30.9 ms
Dark Overshoot Error
4.5%
9 RGB
Inputs
Input Lag
9.5
8.7
Native Resolution @ Max Hz
3.9 ms
4.9 ms
Native Resolution @ 120Hz
6.1 ms
Native Resolution @ 60Hz
8.5 ms
10.4 ms
Variable Refresh Rate
4.1 ms
Variable Refresh Rate @ 60Hz
9.5 ms
10 Bit HDR
N/A
Backlight Strobing (BFI)
4.2 ms
7.1 ms
Resolution
8.3
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
Screen Diagonal
27.0"
Screen Area
310 in²
PS5 Compatibility
4.9
PS5 Compatibility Photo
PS5 Compatibility Table
4k @ 120Hz
No
4k @ 60Hz
Yes
1440p @ 120Hz
Yes
1440p @ 60Hz
Yes
1080p @ 120Hz
Yes
1080p @ 60Hz
Yes
Xbox Series X|S Compatibility
6.6
XSX Compatibility Photo
XSX Compatibility Table
4k @ 120Hz
No
4k @ 60Hz
Yes
1440p @ 120Hz
Yes
1440p @ 60Hz
Yes
1080p @ 120Hz
Yes
1080p @ 60Hz
Yes
Inputs Photos
Inputs 1
Inputs 2
Video And Audio Ports
DisplayPort
1 (DP 1.4)
1 (DP 1.4)
DisplayPort Transmission Bandwidth
No DisplayPort 2.1
Mini DisplayPort
No
No
HDMI
2 (HDMI 2.0)
1 (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
HDR10
Yes
Yes
3.5mm Audio In
No
3.5mm Microphone In
No
No
DisplayPort Out
No
USB
2 (USB 3.0)
1 (Service Port Only)
USB C
No
0
Digital Optical Audio Out
No
Analog Audio Out RCA
No
Power Supply
Internal
External Brick
USB
USB-A Ports
2 (USB 3.0)
1 (Service Port Only)
USB-A Rated Speed
480Mbps (USB 2.0)
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
Speakers
Yes
No
RGB Illumination
No
No
Multiple Input Display
PIP + PBP
No
KVM Switch
No
HDR10
Yes
Yes
On-Screen Display (OSD)
OSD Picture
Controls
Controls Picture
In The Box
In The Box Picture
Check Price
27"
G27QC
SEE PRICE
Amazon.com27"
LS27AG550ENXZA
SEE PRICE
Amazon.com27"
G27QC
SEE PRICE
Amazon.com27"
LS27AG550ENXZA
SEARCH
Amazon.com27"
G27QC
SEE PRICE
Amazon.com27"
G27QC
SEE PRICE
Amazon.com27"
G27QC
SEE PRICE
Amazon.com27"
G27QC
SEE PRICE
Amazon.com27"
G27QC
SEE PRICE
BestBuy.com27"
G27QC
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BestBuy.com27"
G27QC
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Amazon.com27"
G27QC
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Gigabyte G27QC
Samsung Odyssey G55A S27AG55
Comments
Gigabyte G27QC vs Samsung Odyssey G55A S27AG55: Main Discussion
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