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Reviewed on Aug 14, 2019

LG 34GK950F-B MONITOR REVIEW

Usage Ratings - Version 1.0
8.0
Mixed Usage
8.1
Office
8.4
Gaming
8.0
Multimedia
8.0
Media Creation
6.9
HDR Gaming
Size : 34"
Resolution : 3440x1440
Refresh Rate : 144 Hz
LCD Type
:
IPS
Variable Refresh Rate
:
FreeSync

The LG 34GK950F-B is a very good monitor overall, and it delivers a great gaming experience. It has an excellent response time and an optional black frame insertion feature that can further improve motion clarity. This monitor supports AMD's FreeSync variable refresh rate technology, even when connected to a recent NVIDIA graphics card, and it has outstanding low input lag. It delivers decent picture quality, with very good peak brightness in SDR and great reflection handling. This monitor supports HDR, but it's not bright enough for a great HDR movie experience. Unfortunately, like most IPS monitors, it doesn't look as good in a dark room.

Test Results
Design 7.5
Picture Quality 7.4
Motion 9.1
Inputs 9.2
Pros
  • Excellent response time.
  • Excellent low input lag
  • Outstanding gradient handling.
Cons
  • Bad black uniformity.
  1. 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.

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7.5

Design

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 good design overall. It has a very similar design to the other LG UltraGear monitors we've tested, including the LG 32GK650F-B, but with a wide format curved screen. Unlike the other LG, this model doesn't have an RGB bias-lighting feature. Although it's almost entirely made of plastic, it seems to have a decent build quality, and there are no obvious areas of concern.

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

The stand supports the LG 34GK950F-B fairly well but doesn't completely eliminate wobble. It's wide but narrow, so it doesn't prevent you from placing objects in front of the display.

5.0 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.

Back
Wall Mount : VESA 100x100

Like other UltraGear monitors from LG, there is a red ring on the back of the monitor, but it doesn't have RGB lighting. There is a quick-release on the stand, which is a nice touch, and it can be VESA-mounted if you don't want to use the included stand. There is only basic cable management through a clip on the back of the stand.

Borders
Borders
:
0.4" (1.0 cm)

The borders on the LG 34GK950F-B are thin on all four sides, and they aren't very distracting.

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 Build Quality

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.

7.4

Picture Quality

Overall, the 34GK950F delivers decent picture quality. It has very good peak brightness in SDR and great reflection handling, so glare shouldn't be an issue in a brighter room. It also has very good viewing angles, excellent gray uniformity, and an excellent SDR color gamut. It supports HDR, and can display a wide color gamut, but has only decent peak brightness in HDR, so it isn't great for watching most HDR movies. Like most IPS monitors, it has disappointing contrast and bad black uniformity, with some noticeable backlight bleed, which may be distracting in dark scenes in a dark room.

5.6 Contrast
Native Contrast
:
810 : 1
Contrast with local dimming
:
N/A

Most IPS monitors have disappointing native contrast, and the 34GK950F is no exception. This isn't great for gaming in a dark room, especially with dark scenes, as blacks tend to appear gray.

0 Local Dimming
Local Dimming
:
No
Backlight
:
Edge

Unfortunately, the LG 34GK950F does not have a local dimming feature. The above video is provided for reference only.

7.9 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, very similar to the 32GK650F-B. There is no noticeable variation in peak brightness with different content, which is great.

6.8 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

Decent peak brightness in HDR on the LG 34GK950F-B. There is almost no variation in peak brightness with different content, which is much better than the LG 34WK95U-W. This monitor is bright enough to deliver a decent HDR gaming experience, but it isn't bright enough for HDR movies.

7.6 Horizontal Viewing Angle
Color Shift from Left
:
43 °
Color Shift from Right
:
43 °
Brightness from Left
:
51 °
Brightness from Right
:
51 °
Black Level from Left
:
75 °
Black Level from Right
:
75 °
Curve Radius : 1800 R

Like most IPS monitors, the LG 34GK950F has good 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.

7.7 Vertical Viewing Angle
Color Shift from Below
:
24 °
Color Shift from Above
:
24 °
Brightness from Below
:
31 °
Brightness from Above
:
31 °
Black Level from Below
:
75 °
Black Level from Above
:
75 °

This monitor has a good 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 Gray Uniformity
50% Std. Dev.
:
2.988 %
50% DSE
:
0.116 %
5% Std. Dev.
:
0.354 %
5% DSE
:
0.039 %

Overall, this monitor has excellent gray uniformity. It isn't perfect, though, and the sides of the screen are a bit darker than the rest. In the center of the screen, though, the overall uniformity is great, and in near-dark scenes, it's excellent.

4.3 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 is noticeable backlight bleed, which may be distracting in dark scenes in a dark room. There is 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.

8.1 Pre Calibration
Picture Mode
:
sRGB
Luminance
:
180 cd/m²
Luminance Settings
:
30
Contrast Setting
:
N/A
RGB controls
:
N/A
Color Temperature
:
6183 K
White Balance dE
:
2.79
Color dE
:
2.13
Gamma
:
2.25

With the most accurate out-of-the-box settings, this monitor has good accuracy. 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 this mode, gamma follows the sRGB target curve well for brighter scenes, but dark scenes are over-darkened significantly. Colors have great accuracy though, and most people won't notice any issues.

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

After calibration, this monitor has excellent 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 SDR Color Gamut
sRGB xy
:
99.2 %
Adobe RGB xy
:
86.8 %

s.RGB Picture Mode: Gamer 2 (calibrated)
Adobe RGB Picture Mode: Gamer 2

Excellent SDR color gamut. 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 SDR Color Volume
sRGB in ICtCp
:
97.4 %
Adobe RGB in ICtCp
:
91.4 %

s.RGB 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 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 used by most current games and movies, but only decent coverage of the wider Rec. 2020 color space.

6.4 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

Overall, the LG 34GK950F has mediocre 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 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 has no signs of temporary image retention, even immediately after displaying our high-contrast static test image for 10 minutes.

9.7 Gradient
Color Depth
:
10 Bit

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

9.3 Color Bleed
Pixel row error
:
0.003 %
Pixel column error
:
0.137 %

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

8.0 Reflections

The LG 34GK950F-B has great reflection handling, making it an excellent choice in a brighter room.

9.1

Motion

The LG 34GK950F-B has excellent motion handling. It has an excellent response time, and the backlight is completely flicker-free. There is an optional black frame insertion feature that can improve the appearance of motion, but it's only supported over DisplayPort. This monitor supports AMD's FreeSync variable refresh rate technology, even when connected to a recent NVIDIA graphics card, but there's also a native NVIDIA G-SYNC model if you want to get the most out of your NVIDIA graphics card.

9.1 Motion Blur
80% Response Time
:
4.4 ms
100% Response Time
:
10.6 ms
Best Overdrive Setting
:
Fast

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

The LG 34GK950F has an excellent response time. From the adjustable overdrive settings, we recommend 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 is significant overshoot in some transitions, especially in dark scenes.

9.0 Image Flicker
Flicker-free : Yes
PWM Dimming Frequency
:
0 Hz
Black Frame Insertion (BFI)
:
Yes
BFI Maximum Frequency
:
144 Hz
BFI Minimum Frequency
:
120 Hz

The backlight is completely flicker-free at all brightness levels. There is an optional black-frame insertion feature, which can flicker at either 120Hz or 144Hz, to match the refresh rate. This feature is only supported over DisplayPort, though.

9.2 Refresh Rate
Native
:
144 Hz
Factory Overclock
:
N/A
Variable Refresh Rate
:
FreeSync
G-SYNC Compatible
:
Yes
VRR Maximum
:
144 Hz
VRR Minimum
:
< 20 Hz
VRR Maximum With OC
:
N/A
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.

9.2

Inputs

The LG 34GK950F-B has outstanding low input lag at the native refresh rate, even with FreeSync, HDR, or the black frame insertion feature enabled. The 60Hz input lag is very high though, which isn't great for console gaming. The large, high-resolution screen delivers an excellent amount of screen real-estate, great for multitasking. It has a good selection of inputs, including a two-port USB hub.

9.4 Input Lag
Native Resolution
:
4.2 ms
Non-Native Res @ Native Refresh
:
N/A
Native Resolution @ 60 Hz
:
23.8 ms
Variable Refresh Rate
:
5.2 ms
10 bit HDR
:
4.2 ms
Black Frame Insertion (BFI)
:
7.2 ms

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 is 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.

8.8 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 large, high-resolution screen on the 34GK950F is great for multitasking, as it has an excellent amount of screen real estate.

Inputs

This monitor has a good selection of inputs, including 2 HDMI ports, and a 2 port USB 3.0 Hub.

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

Features

The LG 34GK950F has a few additional features. It supports HDR10, but has no internal speakers, and it doesn't support picture-in-picture or picture-by-picture. There aren't many additional gaming features, but it's possible to add virtual crosshairs to any game.

Additional Features
Speakers
:
No
HDR10 : Yes
Multiple input display
:
No

There are very few additional features on this display. Like many gaming monitors there is an option to add virtual crosshairs to your favorite games. There is a Black Stabilizer feature, which adjusts the gamma of dark scenes to make it easier to see objects in shadows.

On-Screen Display (OSD)
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.

In The Box

  • Quick Setup Guide
  • USB-B Cable
  • HDMI Cable
  • DisplayPort Cable
  • Power Adapter & Cable
  • Driver/Manual CD

Differences between Sizes and Variants

We tested the 34" 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

Left: LG 34UC79G-B. Middle: LG 34GK950F-B. Right: Samsung C34F791.
Unlike our other photographs, this picture wasn't taken under a controlled environment, so do not draw conclusions from it.

The LG 34GK950F is a great ultrawide gaming monitor overall. See also our reviews for the best ultrawide gaming monitors, the best gaming monitors, and the best gaming monitors for PS4.

Dell Alienware AW3418DW
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.

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 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.

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.

8.0 Mixed Usage

This 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. It's a great gaming monitor as well, with a fast response time, low input lag, and FreeSync support. Unfortunately, it isn't great for gaming or watching videos in a dark room.

8.1 Office

Good monitor for office use. It has an excellent amount of screen real estate, great for multitasking. It has very good peak brightness, great reflection handling, and wide viewing angles. It has limited ergonomics, with a good tilt and height adjustment, but it has a very narrow swivel range, and it can't rotate to portrait orientation.

8.4 Gaming

This is a great gaming monitor overall. It has a great response time, excellent low input lag, and a fast refresh rate, and it supports FreeSync variable refresh rate technology. Unfortunately, it has limited ergonomics, and it doesn't look as good in a dark room.

8.0 Multimedia

The LG 34GK950F is a good monitor for multimedia. 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, very good peak brightness, and great reflection handling.

8.0 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.

6.9 HDR Gaming

Decent monitor for HDR gaming. It's limited by the disappointing contrast and bad black uniformity, and it doesn't have a local dimming feature. Other than that, it has great gaming performance, with an excellent response time and FreeSync support. It also has excellent low input lag.

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