LG 34GK950F-B Monitor Review

Tested using Methodology v1.1
Updated May 04, 2020 at 11:21 am
LG 34GK950F-B Picture
7.8
Mixed Usage
7.8
Office
8.2
Gaming
7.7
Multimedia
7.8
Media Creation
6.9
HDR Gaming
Size 34"
Resolution 3440x1440
Max Refresh Rate
144 Hz
LCD Type
IPS
Variable Refresh Rate
FreeSync

The LG 34GK950F-B is a very good monitor that provides ample screen space for productivity work as well as delivering a great gaming experience. It has a 21:9 aspect ratio, a 1440p resolution, and its IPS panel has excellent viewing angles, so the image looks good regardless of where you sit. It has an excellent response time and an optional black frame insertion feature that can further improve motion clarity, and its FreeSync support also works with recent NVIDIA graphics cards. There's HDR support, although the performance is limited by its peak brightness, and like most IPS monitors, it has significant black uniformity issues and a poor contrast ratio that makes it less ideal for dark rooms. Luckily, it has an exceptionally low input lag and a 144Hz refresh rate to provide incredible responsiveness when gaming.

Our Verdict

7.8 Mixed Usage

The LG 34GK950F-B is a good monitor for most uses. It's a great choice for office use, especially in a brighter environment, and it has excellent screen real estate, so you can have multiple windows opened side-by-side. It's also a great gaming monitor, as it has a fast response time, low input lag, and support for FreeSync variable refresh rate. However, it isn't well-suited for dark rooms due to its poor contrast ratio and bad black uniformity, and while it supports HDR, it can't get bright enough to make highlights pop in HDR movies.

Pros
  • Excellent response time.
  • Excellent low input lag.
  • Outstanding gradient handling.
Cons
  • Bad black uniformity.
7.8 Office

The LG 34GK950F-B is a good monitor for office use. It has a large screen size that's great for multitasking, and its 1440p resolution makes text look incredibly sharp. It has a very good peak brightness that's suitable for well-lit rooms and its wide viewing angles make it easy to share work with your colleagues. Although it can't be used in portrait mode due to its wide format, it has decent height and tilt adjustment range.

8.2 Gaming

The LG 34GK950F-B is a great gaming monitor. It has a great response time, excellent low input lag, and a high refresh rate. It supports FreeSync variable refresh rate technology, which is also compatible with NVIDIA graphics cards, but unfortunately, it has limited ergonomics, and it doesn't look as good in dark rooms.

7.7 Multimedia

The LG 34GK950F-B is a good monitor for media consumption. The large, high-resolution screen is great for watching videos, and it has good viewing angles, perfect for sharing the latest trends with a few friends. It has excellent gray uniformity, with almost no noticeable dirty screen effect, and visibility is good in well-lit rooms due to its good peak brightness. Its reflection handling is mediocre, though, so it's best to avoid having light shining directly on the screen.

7.8 Media Creation

The LG 34GK950F-B is a very good monitor for media creation. It has an excellent amount of screen real estate, so you can see more of your project at once. It also has good viewing angles, perfect for sharing your screen with your clients or coworkers. Its out-of-the-box color accuracy is impressive, with full coverage of the sRGB color space and excellent coverage of the Adobe RGB color space, and it can display a wide color gamut as well.

6.9 HDR Gaming

The LG 34GK950F-B is a decent monitor for HDR gaming. It's limited by the monitor's disappointing contrast ratio and bad black uniformity, as well as its lack of a local dimming feature. Other than that, it has great gaming performance, with excellent response time, FreeSync support, and excellent low input lag.

  • 7.8 Mixed Usage
  • 7.8 Office
  • 8.2 Gaming
  • 7.7 Multimedia
  • 7.8 Media Creation
  • 6.9 HDR Gaming
  1. Update 6/4/2020: We've retested the input lag as we've noticed some inconsistencies. All the results are still within margin of error, except when playing with VRR @ 60Hz, which has increased. The score has been adjusted accordingly.
  2. Update 2/17/2020: Converted to Test Bench 1.1.
  3. Update 8/14/2019: We retested the input lag with the latest firmware, and found it decreased significantly. The scores and text have been updated.

Check Price

Video

Test Results

Design
Design
Style
Curved Yes
Curve Radius 1800R
Weight (without stand)
12.8 lbs (5.8 kg)
Weight (with stand)
16.8 lbs (7.6 kg)

The LG 34GK950F-B has a fairly simple design. It has thin bezels on all sides, and its wide V-shaped stand doesn't take up a significant amount of desk space. There are some red accents on the stand and on the back monitor, but it's fairly minimal and won't look out of place in a professional office environment.

Design
Stand
Width
22.1" (56.1 cm)
Depth
11.2" (28.4 cm)

The stand supports the monitor but there's still a bit of wobble when nudged. The feet are fairly thin, leaving you more desk space.

5.1
Design
Ergonomics
Height Adjustment
4.3" (10.9 cm)
Switch Portrait/Landscape No
Swivel Range -15° to 15°
Tilt Range -15° to 5°

The stand has a decent height adjustment and adequate tilt range, but it has a bad swivel range. Due to the wide format, curved screen, it can't rotate to portrait orientation.

Design
Back
Wall Mount VESA 100x100

The back of the monitor is plain. The red circular accent doesn't light up and there's basic cable management through a clip on the back of the stand.

Design
Borders
Borders
0.4" (1.0 cm)

The borders are thin on all four sides, and they aren't very distracting.

Design
Thickness
Thickness (with stand)
10.1" (25.7 cm)
Thickness (without stand)
4.2" (10.7 cm)

Due to the curvature of the screen, the LG 34GK950F-B is a bit thicker than most, even when VESA-mounted.

7.0
Design
Build Quality

The 34GK950F-B has a decent build quality overall. The external panels of the monitor are almost entirely made of plastic, but we didn't notice any potential weak spots or areas of concern. If you want a monitor with better build quality, take a look at the Dell Alienware AW3420DW.

Picture Quality
5.6
Picture Quality
Contrast
Native Contrast
810 : 1
Contrast With Local Dimming
N/A

As is expected of most IPS panels, the contrast ratio is sub-par. This makes blacks look like gray, especially in dark environments.

0
Picture Quality
Local Dimming
Local Dimming
No
Backlight
Edge

The LG 34GK950F doesn't have a local dimming feature. The above video is provided for reference only.

7.9
Picture Quality
SDR Peak Brightness
SDR Real Scene
350 cd/m²
SDR Peak 2% Window
332 cd/m²
SDR Peak 10% Window
332 cd/m²
SDR Peak 25% Window
333 cd/m²
SDR Peak 50% Window
333 cd/m²
SDR Peak 100% Window
333 cd/m²
SDR Sustained 2% Window
332 cd/m²
SDR Sustained 10% Window
332 cd/m²
SDR Sustained 25% Window
333 cd/m²
SDR Sustained 50% Window
333 cd/m²
SDR Sustained 100% Window
333 cd/m²
SDR ABL
0.000

Very good peak brightness. Visibility shouldn't be an issue in most rooms, but it may not be enough if there's light shining directly on the screen. It's remarkably consistent when displaying different content, which is great.

6.8
Picture Quality
HDR Peak Brightness
HDR Real Scene
412 cd/m²
HDR Peak 2% Window
401 cd/m²
HDR Peak 10% Window
401 cd/m²
HDR Peak 25% Window
402 cd/m²
HDR Peak 50% Window
402 cd/m²
HDR Peak 100% Window
413 cd/m²
HDR Sustained 2% Window
400 cd/m²
HDR Sustained 10% Window
401 cd/m²
HDR Sustained 25% Window
402 cd/m²
HDR Sustained 50% Window
402 cd/m²
HDR Sustained 100% Window
402 cd/m²
HDR ABL
0.000

The 34GK950F-B has a decent peak brightness in HDR mode. There's almost no variation in peak brightness with different content and it's bright enough to deliver a decent HDR gaming experience, but not for HDR movies.

8.7
Picture Quality
Horizontal Viewing Angle
Color Washout From Left
49 °
Color Washout From Right
48 °
Color Shift From Left
59 °
Color Shift From Right
56 °
Brightness Loss From Left
50 °
Brightness Loss From Right
50 °
Black Level Raise From Left
70 °
Black Level Raise From Right
70 °
Gamma Shift From Left
60 °
Gamma Shift From Right
62 °

The 34GK950F-B has excellent horizontal viewing angles. The black levels remain relatively constant, and the brightness drop is very gradual, so the image doesn't appear washed out until a very wide angle. Colors also remain accurate to a moderate angle but lose accuracy before the brightness decreases.

6.8
Picture Quality
Vertical Viewing Angle
Color Washout From Below
28 °
Color Washout From Above
29 °
Color Shift From Below
35 °
Color Shift From Above
39 °
Brightness Loss From Below
31 °
Brightness Loss From Above
33 °
Black Level Raise From Below
70 °
Black Level Raise From Above
70 °
Gamma Shift From Below
29 °
Gamma Shift From Above
32 °

This monitor has a decent vertical viewing angle. Colors lose accuracy at a minor angle, but the brightness doesn't decrease as quickly, and the black levels remain relatively flat.

8.6
Picture Quality
Gray Uniformity
50% Std. Dev.
2.988 %
50% DSE
0.116 %
5% Std. Dev.
0.354 %
5% DSE
0.039 %

Excellent gray uniformity. The sides are a bit darker; however, the center of the screen is very uniform, with almost no dirty screen effect. In dark scenes, uniformity is equally excellent.

4.3
Picture Quality
Black Uniformity
Native Std. Dev.
3.155 %
Std. Dev. w/ L.D.
N/A

Like most IPS monitors, this display has bad black uniformity. There's noticeable backlight bleed, which may be distracting in dark scenes in a dark room. There's worse bleed from the corners of the display, but due to the curvature of the monitor, the image is partially cropped, so it looks worse in person than the image suggests.

8.0
Picture Quality
Pre Calibration
Picture Mode
Srgb
Luminance
180 cd/m²
Luminance Settings
30
Contrast Setting
N/A
RGB Controls
Default
Gamma Setting
Default
Color Temperature
6183 K
White Balance dE
2.79
Color dE
2.13
Gamma
2.25

The LG 34GK950F has an impressive color accuracy out-of-the-box. The sRGB picture mode is the most accurate, but unfortunately, the only setting you can adjust in this mode is the brightness, so most people will want to use something else.

In sRGB mode, gamma follows the target curve well for brighter scenes, but dark scenes are over-darkened significantly. Colors have great accuracy, and most people won't notice any issues.

9.5
Picture Quality
Post Calibration
Picture Mode
Gamer 2
Luminance
101 cd/m²
Luminance Settings
14
Contrast Setting
60
RGB Controls
51-50-51
Gamma Setting
Mode 2
Color Temperature
6467 K
White Balance dE
0.69
Color dE
0.57
Gamma
2.17

After calibration, this monitor has outstanding accuracy. Almost all inaccuracies are corrected, except for pure blue, which is still slightly inaccurate. Gamma almost follows the target curve perfectly, and the color temperature is very close to the calibration target of 6500K.

You can download our ICC profile calibration here. This is provided for reference only and should not be used, as the calibration values vary per individual unit even for the same model due to manufacturing tolerances.

9.3
Picture Quality
SDR Color Gamut
sRGB xy
99.2 %
Adobe RGB xy
86.8 %
sRGB Picture Mode
Gamer 2
Adobe RGB Picture Mode
Gamer 2

The LG 34GK950F can display the entire sRGB color space, and has excellent coverage of the wider Adobe RGB color space, great for professional photo editing.

9.4
Picture Quality
SDR Color Volume
sRGB In ICtCp
97.4 %
Adobe RGB In ICtCp
91.4 %
sRGB Picture Mode
Gamer 2
Adobe RGB Picture Mode
Gamer 2

Outstanding SDR color volume. It can't display dark, saturated colors very well due to the limited contrast, and it can't display very bright blues, but this is normal for most LED displays.

7.7
Picture Quality
HDR Color Gamut
Wide Color Gamut
Yes
DCI P3 xy
85.4 %
Rec. 2020 xy
69.5 %
DCI P3 Picture Mode
Gamer 2
Rec. 2020 Picture Mode
Gamer 2

Good HDR color gamut. It has excellent coverage of the DCI P3 color space used by most current games and movies, but only decent coverage of the wider Rec. 2020 color space.

6.4
Picture Quality
HDR Color Volume
DCI-P3 In ICtCp
67.1 %
Rec. 2020 In ICtCp
61.6 %
DCI P3 Picture Mode
Gamer 2
Rec. 2020 Picture Mode
Gamer 2

The LG 34GK950F has a mediocre HDR color volume. It's limited by the HDR color gamut, and it can't display dark, saturated colors very well due to the limited contrast. Pure white is much brighter than colors in HDR.

10
Picture Quality
Image Retention
IR After 0 Min Recovery
0.00 %
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 %

The LG 34GK950F-B shows no signs of temporary image retention, even immediately after displaying our high-contrast static test image for 10 minutes.

9.7
Picture Quality
Gradient
Color Depth
10 Bit

This monitor has outstanding gradient performance. There's almost no noticeable banding in any shade.

9.3
Picture Quality
Color Bleed
Pixel Row Error
0.003 %
Pixel Column Error
0.137 %

There's some very slight color bleed, but this shouldn't be noticeable with most content.

6.3
Picture Quality
Reflections
Screen Finish
Matte
Total Reflections
7.4 %
Indirect Reflections
3.7 %
Calculated Direct Reflections
3.6 %

The LG 34GK950F-B has mediocre reflection handling, although it isn't as bad in person and visibility can be improved by increasing the monitor's brightness.

7.5
Picture Quality
Text Clarity
Sub-Pixel Layout
RGB

Text clarity is good. With ClearType enabled (top photo), diagonal lines look much better and text look bolder overall.

Motion
9.0
Motion
Response Time @ Max Refresh Rate
Best Overdrive Setting
Fast
Rise / Fall Time
4.2 ms
Total Response Time
9.7 ms
Overshoot Error
5.7 %
Dark Rise / Fall Time
4.1 ms
Dark Total Response Time
10.5 ms
Dark Overshoot Error
9.0 %

Mode Response Time Chart Motion Blur Photo Response Time Table
Off Chart Photo Table
Normal Chart Photo Table
Fast Chart Photo Table
Faster Chart Photo Table

The LG 34GK950F has an excellent response time. The best overdrive setting is the 'Fast' mode, as it delivers clear motion with a very short blur trail, no noticeable overshoot, and only a bit of undershoot in some transitions. 'Faster' delivers a slightly faster response time, but there's significant overshoot in some transitions, especially in dark scenes.

8.2
Motion
Response Time @ 60Hz
Best Overdrive Setting
Normal
Rise / Fall Time
5.5 ms
Total Response Time
15.0 ms
Overshoot Error
3.8 %
Dark Rise / Fall Time
5.7 ms
Dark Total Response Time
15.8 ms
Dark Overshoot Error
7.2 %

Mode Response Time Chart Motion Blur Photo Response Time Table
Off Chart Photo Table
Normal Chart Photo Table
Fast Chart Photo Table
Faster Chart Photo Table

Great response time at 60Hz. It's slightly slower than when playing at maximum refresh rate, resulting in a bit more motion blur. The best overdrive setting for playing at 60Hz is 'Normal', although there's still some overshoot. The 'Fast' setting is good too, as the overshoot and undershoot don't look as bad in person.

10
Motion
Image Flicker
Flicker-Free Yes
PWM Dimming Frequency
0 Hz

The backlight is completely flicker-free at all brightness levels.

6.0
Motion
Black Frame Insertion (BFI)
Black Frame Insertion (BFI)
Yes
BFI Maximum Frequency
144 Hz
BFI Minimum Frequency
120 Hz

There's an optional black-frame insertion feature that can help reduce the appearance of motion blur and it can flicker at either 120Hz or 144Hz to match the refresh rate. This feature is only supported over DisplayPort.

9.0
Motion
Refresh Rate
Native
144 Hz
Max Refresh Rate
144 Hz
Variable Refresh Rate
Yes
FreeSync
Yes
G-SYNC
Compatible (Tested)
VRR Maximum
144 Hz
VRR Minimum
< 20 Hz
VRR Supported Connectors DisplayPort, HDMI

The LG 34GK950F has an excellent refresh rate over DisplayPort. Over HDMI, it's limited to an 85Hz refresh rate, which is decent, but in this mode, it's limited to 8-bit color. It can display 10-bit color over HDMI, but only at 60Hz. It supports FreeSync variable refresh rate technology over both HDMI and DisplayPort, but due to the limited refresh rate over HDMI, the VRR range is limited over HDMI. Over DisplayPort, the VRR range is outstanding, delivering a nearly tear-free gaming experience, even in extremely demanding scenes.

Inputs
9.4
Inputs
Input Lag
Native Resolution
4.2 ms
Native Resolution @ 60Hz
23.8 ms
Variable Refresh Rate
5.2 ms
Variable Refresh Rate @ 60Hz
10.1 ms
10 Bit HDR
4.2 ms
Black Frame Insertion (BFI)
7.2 ms

Update 06/04/2020: We've retested the input lag as we've noticed some inconsistencies. All the results are still within margin or error, except when playing with VRR@60Hz, which has increased. The score has been adjusted accordingly.

Update 08/14/2019: We've retested the input lag after updating the monitor to the latest firmware. The scores and text have been updated.

The LG 34GK950F-B has outstanding low input lag. The input lag remains low even with FreeSync or HDR enabled. With the optional black frame insertion feature enabled, the input lag is slightly higher but still great. The 60Hz input lag is quite a bit higher, which isn't great for console gaming.

When you first receive this monitor, it's very important to update the firmware, as the factory firmware has very high input lag. To update the firmware, the monitor has to be connected to your computer with the included USB adapter, and LG's OnScreen Control software must be installed. When you open the software with the monitor connected, it should automatically detect that a new firmware is available. If it doesn't, your monitor might already have the newest version. If you want a monitor with an even lower input lag, take a look at the Nixeus EDG 34.

8.7
Inputs
Resolution And Size
Native Resolution 3440 x 1440
Aspect Ratio 21:9
Megapixels 5.0 MP
Pixel Density
109 PPI
Screen Diagonal 34.1 inches
Screen Area 415 sq inches

The LG 34GK950F has a large, high-resolution screen that's great for multitasking and provides an immersive gaming experience.

Inputs
Inputs
Inputs
Total Inputs
DisplayPort 1 (DP 1.4)
Mini DisplayPort No
HDMI 2 (HDMI 2.0)
DVI No
VGA No
DisplayPort Out No
USB 2 (USB 3.0)
USB C No
Analog Audio Out 3.5mm 1
Microphone In 3.5mm No
Digital Optical Audio Out No
Analog Audio Out RCA No
Power Supply External Brick

There's an analog audio out port, and the volume can be controlled through the monitor's OSD.

Features
Features
Additional Features
RGB Illumination
No
Speakers
No
HDR10 Yes
Multiple Input Display
No

The 34GK950F has only a few additional features, including:

  • Crosshair: Puts a crosshair on screen for shooter games.
  • Black Stabilizer: Helps make objects more visible in dark scenes.

Features
On-Screen Display (OSD)
Features
Controls

Like most LG monitors, the controls consist of a single joystick nub located under the monitor, in the center. This control works well, and the UI is easy to navigate.

Features
In The Box

  • Quick setup guide
  • USB-B cable
  • HDMI cable
  • DisplayPort cable
  • Power adapter and cable
  • Driver CD

Differences Between Sizes and Variants

We tested the 34 inch 34GK950F-B, which is the only size available. The 34GK950 is also available with G-SYNC instead of FreeSync. That model is known as the 34GK950G-B, and we don't expect it to perform the same, as it's limited to a 120Hz refresh rate. There are other models in LG's UltraGear lineup, some of which are listed in the table below.

If someone comes across a different type of panel or if their 34GK950F doesn't correspond to our review, let us know and we will update the review. Note that some tests such as the gray uniformity may vary between individual units.

Model Size Resolution Refresh Rate Notes
32GK650F-B 32" 1440p 144Hz FreeSync
32GK650G-B 32" 1440p 144Hz G-SYNC
27GK750F-B 27" 1080p 240Hz FreeSync
32GK850F-B 32" 1440p 144Hz FreeSync
32GK850G-B 32" 1440p 144Hz G-SYNC
34GK950F-B 34" 3440x1440 144Hz FreeSync
34GK950G-B 34" 3440x1440 120Hz G-SYNC

The 34GK950F we reviewed was manufactured in April 2019.

Compared to other monitors

Comparison picture

Left: LG 34UC79G-B. Middle: LG 34GK950F-B. Right: Samsung C34F791.

The LG 34GK950F is a very good ultrawide monitor overall, but like most IPS monitors, it has a very low contrast ratio and its black uniformity is quite bad. However, it has one of the best response time and input lag for a responsive gaming experience. For other options, check out our recommendations for the best ultrawide gaming monitors, the best gaming monitors, and the best gaming monitors for PS4.

Dell Alienware AW3420DW
SEE PRICE
Amazon.com

The LG 34GK950F-B is better than the Dell Alienware AW3420DW in most uses. The LG has a higher refresh rate, a significantly higher peak brightness, as well as much better viewing angles. Also, it has better out-of-the-box color accuracy and gradient performance, but the Dell has a much better black uniformity and better gray uniformity.

Dell Alienware AW3418DW/1900R
SEE PRICE
Amazon.com

The LG 34GK950F-B is a bit better than the Dell Alienware AW3418DW for most uses. The 34GK950F supports HDR, and it has an optional black frame insertion feature for clearer motion. The LG supports FreeSync variable refresh rate technology and has a faster refresh rate. The AW3418DW, on the other hand, has native G-SYNC support, great if you want to get the most from your NVIDIA graphics card.

LG 34GN850-B
SEE PRICE
Amazon.com

Overall, the LG 34GK950F-B and the LG 34GN850-B perform very similarly, with the 34GN850-B being marginally better. The 34GN850-B has a faster response time, better reflection handling, and it has better black uniformity, although the latter could be due to panel variance. The 34GN850-B has a slightly higher peak brightness and its refresh rate can be overclocked to 160Hz, but the 34GK950F-B has significantly better horizontal viewing angles and it has a black frame insertion feature, which the 34GN850-B lacks.

LG 34UC79G-B
SEE PRICE
Amazon.com

The LG 34GK950F-B is much better than the LG 34UC79G-B for most uses. The 34GK950F has a much higher native resolution, supports HDR, and has better reflection handling.

ASUS ROG Swift PG348Q
SEE PRICE
Amazon.com

The LG 34GK950F-B is better than the ASUS ROG Swift PG348Q for most uses, but some people might prefer the ASUS for gaming. The LG supports HDR, has an optional black frame insertion feature, and has a higher refresh rate. The biggest difference for gamers is that the LG supports AMD's FreeSync variable refresh rate technology, whereas the ASUS supports NVIDIA's G-SYNC technology.

LG 32GK650F-B
SEE PRICE
Amazon.com

The LG 34GK950F-B and the LG 32GK650F-B use different panel technologies, each with their own advantages and disadvantages. The 34" model uses an IPS panel, with much wider viewing angles, and it has a wide format aspect ratio, which some people prefer. The 32" model has a VA panel, which looks better in a dark room.

Nixeus EDG 34
SEE PRICE
Amazon.com

The LG 34GK950F-B is a much better monitor than the Nixeus EDG 34. The response time is significantly better and there's a BFI feature to help reduce motion blur as well. The LG has an IPS panel, so the viewing angles are much better, but this comes at the expense of a good contrast ratio - which is quite disappointing on the LG. The Nixeus has a slightly better input lag and better gray uniformity as well.

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