Products
Samsung C34F791/CF791
Samsung C34J791/CJ791
Tested using Methodology v1.0
Updated Jun 07, 2024 08:04 PM
SEE PRICE
Amazon.com
Tested using Methodology v1.0
Updated Jul 31, 2024 03:34 PM
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Amazon.com
Size34"
LCD Type
VA
Variable Refresh Rate
FreeSync
Native Resolution3440 x 1440
Native Refresh Rate
100 Hz
Size34"
LCD Type
VA
Variable Refresh Rate
FreeSync
Native Resolution3440 x 1440
Native Refresh Rate
100 Hz
Our Verdict
Samsung C34F791/CF791
Samsung C34J791/CJ791
The Samsung C34J791/CJ791 is better than the Samsung C34F791/CF791. The two monitors have very similar picture quality. The Samsung CJ791, however, has a much lower input lag that makes it more responsive to your actions, and this is great regardless if you're a gamer or not. It also has Thunderbolt 3 support.
Variants
- C34F791 (34")
- C34J791 (34")
Check Price
34"
C34F791
SEE PRICE
Amazon.com
34"
C34J791
SEE PRICE
Amazon.com
34"
C34F791
SEE PRICE
Walmart.com
34"
C34J791
SEE PRICE
BestBuy.com
34"
C34F791
SEARCH
B&H
34"
C34J791
SEE PRICE
Walmart.com
34"
C34F791
SEARCH
BestBuy.com
34"
C34J791
SEARCH
B&H
34"
C34F791
SEARCH
Samsung.com
34"
C34J791
SEARCH
Samsung.com
Main Differences for
Mixed Usage
Mixed Usage
Threshold
Mixed Usage
6.9
7.2
Input Lag
7.2
9.4
Full Comparison
Design
Style
Design Picture
Size
34"
34"
Curved
Yes
Yes
Curve radius
1500R
1500R
Weight (without stand)
13.2 lbs (6.0 kg)
15.0 lbs (6.8 kg)
Weight (with stand)
16.5 lbs (7.5 kg)
16.5 lbs (7.5 kg)
Stand
Stand picture
Width
9.7" (24.6 cm)
9.6" (24.4 cm)
Depth
12.2" (31.0 cm)
12.2" (31.0 cm)
Ergonomics
4.7
4.7
Ergonomics picture
Height Adjustment
3.9" (9.9 cm)
3.9" (9.9 cm)
Switch portrait/landscape
No
No
Swivel Range
N/A
N/A
Tilt Range
-20° to 15°
-20° to 15°
Back
Back picture
Wall Mount
VESA 100x100
VESA 100x100, VESA 200x200
Borders
Borders picture
Borders
0.3" (0.8 cm)
0.4" (1.0 cm)
Thickness
Thickness picture
Thickness (with stand)
8.1" (20.6 cm)
8.3" (21.1 cm)
Thickness (without stand)
4.6" (11.7 cm)
6.5" (16.5 cm)
Build Quality
8.0
8.0
Build Quality picture
Picture Quality
Contrast
7.6
7.8
Checkerboard Picture
LCD Type
VA
VA
Native Contrast
2,527 : 1
2,904 : 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 Peak Brightness
7.0
6.9
SDR Real Scene
264 cd/m²
251 cd/m²
SDR Peak 2% Window
247 cd/m²
248 cd/m²
SDR Peak 10% Window
246 cd/m²
249 cd/m²
SDR Peak 25% Window
246 cd/m²
249 cd/m²
SDR Peak 50% Window
245 cd/m²
248 cd/m²
SDR Peak 100% Window
244 cd/m²
248 cd/m²
SDR Sustained 2% Window
246 cd/m²
248 cd/m²
SDR Sustained 10% Window
246 cd/m²
249 cd/m²
SDR Sustained 25% Window
245 cd/m²
249 cd/m²
SDR Sustained 50% Window
245 cd/m²
248 cd/m²
SDR Sustained 100% Window
244 cd/m²
248 cd/m²
SDR ABL
0.001
0.000
HDR Peak Brightness
0.0
0.0
HDR Real Scene
N/A
N/A
HDR Peak 2% Window
N/A
N/A
HDR Peak 10% Window
N/A
N/A
HDR Peak 25% Window
N/A
N/A
HDR Peak 50% Window
N/A
N/A
HDR Peak 100% Window
N/A
N/A
HDR Sustained 2% Window
N/A
N/A
HDR Sustained 10% Window
N/A
N/A
HDR Sustained 25% Window
N/A
N/A
HDR Sustained 50% Window
N/A
N/A
HDR Sustained 100% Window
N/A
N/A
HDR ABL
N/A
N/A
Horizontal Viewing Angle
4.9
4.8
Horizontal Viewing Angle Video
Horizontal Color Shift Picture
Color Shift from Left
33°
31°
Color Shift from Right
32°
30°
Horizontal Brightness Picture
Brightness from Left
45°
44°
Brightness from Right
45°
40°
Horizontal Black Level Picture
Black Level from Left
12°
13°
Black Level from Right
11°
13°
Curve Radius
1,500R
1,500R
Vertical Viewing Angle
4.4
4.6
Vertical Viewing Angle Video
Vertical Color Shift Picture
Color Shift from Below
26°
26°
Color Shift from Above
26°
23°
Vertical Brightness Picture
Brightness from Below
33°
37°
Brightness from Above
33°
35°
Vertical Black Level Picture
Black Level from Below
5°
6°
Black Level from Above
5°
5°
Gray Uniformity
8.2
8.2
50% Uniformity Picture
50% Std. Dev.
4.408%
4.951%
50% DSE
0.103%
0.112%
5% Uniformity Picture
5% Std. Dev.
1.800%
0.915%
5% DSE
0.061%
0.059%
Black Uniformity
5.2
4.9
Native Black Uniformity Picture
Native Std. Dev.
2.554%
2.766%
Black Uniformity Picture with Local Dimming
Std. Dev. w/ L.D.
N/A
N/A
Pre Calibration
7.2
7.3
Pre Calibration Picture
Pre Gamma Curve Picture
Pre Color Picture
Picture Mode
Custom
Custom
Luminance
243 cd/m²
117 cd/m²
Luminance Settings
100
53
Contrast Setting
75
75
RGB controls
Cool1
Cool 1
Color Temperature
6,346 K
6,879 K
White Balance dE
3.46
3.52
Color dE
3.09
2.78
Gamma
2.26
2.22
Post Calibration
9.4
9.5
Post Calibration Picture
Post Gamma Curve Picture
Post Color Picture
Picture Mode
Custom
Custom
Luminance
99 cd/m²
100 cd/m²
Luminance Settings
23
39
Contrast Setting
75
100
RGB Controls
35-44-50
36-40-44
Color Temperature
6,432 K
6,466 K
White Balance dE
0.63
0.48
Color dE
0.84
0.71
Gamma
2.19
2.18
SDR Color Gamut
8.9
8.9
Color Gamut sRGB Picture
sRGB xy
95.6%
95.4%
Color Gamut ARGB Picture
Adobe RGB xy
80.8%
81.8%
SDR Color Volume
9.4
9.5
sRGB Color Volume ITP picture
sRGB in ICtCp
98.5%
99.2%
Adobe RGB Color Volume ITP Picture
Adobe RGB in ICtCp
88.2%
89.5%
HDR Color Gamut
0.0
0.0
Wide Color Gamut
No
No
Color Gamut DCI-P3 Picture
DCI P3 xy
N/A
N/A
Color Gamut Rec.2020 Picture
Rec. 2020 xy
N/A
N/A
HDR Color Volume
0.0
0.0
P3 Color Volume ITP Picture
DCI-P3 in ICtCp
N/A
N/A
2020 Color Volume ITP Picture
Rec. 2020 in ICtCp
N/A
N/A
Image Retention
7.7
7.7
Image Retention Picture
IR after 0 min recovery
0.11%
0.14%
IR after 2 min recovery
0.00%
0.00%
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%
Gradient
8.1
8.5
Gradient Picture
Color Depth
8 Bit
8 Bit
Color Bleed
10
10
Color bleed horizontal
Pixel row error
0.001%
0.001%
Color bleed vertical
Pixel column error
0.001%
0.001%
Reflections
7.5
7.5
Average room
Average room off picture
Bright room off picture
Motion
Motion Blur
9.0
8.7
Motion Blur Picture
Response Time Chart
80% Response Time
4.0 ms
4.9 ms
100% Response Time
13.7 ms
14.0 ms
Best Overdrive Setting
Faster
Fastest
Image Flicker
7.5
7.5
Backlight Picture
Flicker-free
Yes
No
PWM Dimming Frequency
0 Hz
>1000 Hz
Black Frame Insertion (BFI)
No
No
BFI Picture
BFI Frequency Picture
BFI Maximum Frequency
N/A
N/A
BFI Minimum Frequency
N/A
N/A
Refresh Rate
8.8
8.8
Variable Refresh Rate
FreeSync
FreeSync
Native Refresh Rate
100 Hz
100 Hz
Factory Overclock
N/A
N/A
Variable Refresh Rate
FreeSync
FreeSync
G-SYNC Compatible
Partial
Yes
VRR Maximum
100 Hz
100 Hz
VRR Minimum
< 20 Hz
< 20 Hz
VRR Maximum With OC
N/A
N/A
VRR Supported Connectors
DisplayPort, HDMI
DisplayPort, HDMI
Inputs
Input Lag
7.2
9.4
Native Resolution
20.7 ms
5.7 ms
Non-Native Res @ Native Refresh
N/A
5.8 ms
Native Resolution @ 60 Hz
26.9 ms
9.1 ms
Variable Refresh Rate
23.6 ms
6.0 ms
10 bit HDR
N/A
N/A
Black Frame Insertion (BFI)
N/A
N/A
Resolution and Size
8.9
8.9
Native Resolution
3440 x 1440
3440 x 1440
Aspect Ratio
21:9
21:9
Megapixels
5.0 MP
5.0 MP
Pixel Density
110 PPI
110 PPI
Screen Diagonal
34.0"
34.0"
Screen Area
411 in²
411 in²
Inputs
Inputs 1
Inputs 2
Total Inputs
DisplayPort
1 (DP 1.2)
1 (DP 1.2)
Mini DisplayPort
No
No
HDMI
2 (HDMI 2.0)
1 (HDMI 2.0)
DVI
No
No
VGA
No
No
DisplayPort Out
No
No
USB
2 (USB 3.0)
2 (USB 2.0)
USB C
No
2 (Thunderbolt 3, USB, PD)
Analog Audio Out 3.5mm
1
1
Microphone In 3.5mm
No
No
Digital Optical Audio Out
No
No
Analog Audio Out RCA
No
No
Power Supply
External Brick
External Brick
Features
Additional Features
Speakers
Yes
Yes
HDR10
No
No
Multiple input display
PIP + PBP
PIP + PBP
On-Screen Display (OSD)
OSD picture
Controls
Controls picture
In The Box
In The Box picture
Check Price
34"
C34F791
SEE PRICE
Amazon.com
34"
C34J791
SEE PRICE
Amazon.com
34"
C34F791
SEE PRICE
Walmart.com
34"
C34J791
SEE PRICE
BestBuy.com
34"
C34F791
SEARCH
B&H
34"
C34J791
SEE PRICE
Walmart.com
34"
C34F791
SEARCH
BestBuy.com
34"
C34J791
SEARCH
B&H
34"
C34F791
SEARCH
Samsung.com
34"
C34J791
SEARCH
Samsung.com
Samsung C34F791/CF791
Samsung C34J791/CJ791
Comments
Samsung C34F791/CF791 vs Samsung C34J791/CJ791: Main Discussion
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