The Samsung CF791 is a decent ultrawide monitor. It has a VA panel which can produce deep dark scenes which is good for those in a dark room. It also has great gray uniformity, which is good for watching videos or browsing the web. Unfortunately, the image degrades when viewed at an angle, but the curvature of the display helps to mitigate this. The C34F791 also has great motion handling with a fast 100Hz refresh rate.
The design of the Samsung CF791 is very good. The stand supports it well and the monitor feels sturdy. Due to the stand design, the monitor looks thick when viewed from the side. In general, it has an elegant look and nice cable management that adds to its premium feel. The build quality is good and you should have no problems with it.
The tilt range varies along the height adjustment positions:
@ top: 15° to -20°
@ bottom: 2.5° to -30°
The ergonomics of the monitor are inadequate. For a large monitor like this, the provided positioning options are not enough to allow you to place it in a comfortable position.
The back of the monitor is plain. Most of the inputs are housed in a compartment (that comes with a cover) and are pointing downwards so as not to protrude, except the USB ports and the headphones jack.
It is nice that both 100x100 & 200x200 (using the included adapter) VESA wall mounts options are available.
The cable management through the stand is very nice and makes the monitor look clean on the back.
The monitor is quite thick. This is mainly due to its stand and less due to the curvature of the screen, which does mean it has to sit back quite far from a wall. If you VESA mount it, it will not protrude too much given its size.
The picture quality of the Samsung CF781 is decent. It has a good contrast ratio and great gray uniformity, good color accuracy, and no color bleed. Reflection handling is good but the monitor cannot get very bright to be suitable for very bright rooms. It has poor viewing angles, typical of VA panels, and some banding is visible in the darker shades.
Decent SDR peak brightness for this monitor. It keeps the same level of brightness across the various bright window sizes and this is great. This is fine for most rooms, but may not be bright enough to overcome glare in a bright room.
HDR is not supported.
The horizontal viewing angles are poor. Blacks wash out as soon as you deviate from the center axis and a few degrees later, colors shift and brightness fades. This is mitigated a bit by the curvature of the display, which means that the sides of the screen face towards a central seating position.
The vertical viewing angles are bad. In this case, too, blacks are the first ones to lose accuracy, almost immediately off the center axis. And then followed by a shift in colors and loss of brightness as the viewing angle increases.
The out-of-the-box color accuracy of the Samsung C34F791 is good. The Custom picture mode gave us the best out of the box results. Both the white balance dE and the color dE were above our target of 3, thus some people will pick up gray and color inaccuracies. Color temperature was slightly warm giving the picture a very slight red-yellowish tone. Gamma was slightly above our 2.2 target and shades look slightly brighter.
The color accuracy after post calibration is excellent. White balance dE and Color dE are well below the threshold of 3, and it is highly unlikely that you will notice any inaccuracies. At the same time, Gamma was measured almost on the target of 2.2 and color temperature remained just slightly warmer than our target, but this is not noticeable.
You can download our ICC profile calibration here.
s.RGB Picture Mode: Custom (calibrated)
Adobe RGB Picture Mode: Custom
Excellent coverage of the s.RGB colorspace for the Samsung CF791. On the other hand the coverage of the wider Adobe s.RGB colorspace used by professionals in graphics and printing applications is about 80% covered, which isn't really enough for those editing photos in the Adobe RGB color space.
The Samsung C34F791 has a good image retention performance. However, some slight signs of image retention are present immediately after the exposure of our test image. This is unlikely to be noticeable in most content.
The Samsung CF791 has decent gradient performance. 8-bit banding is present along with some artifacts, especially in dark color shades. This, however, should not be an issue for most usages.
Update 01/07/2019: The gradient score has been updated (7.3 -> 8.1), as it was scored incorrectly at the time of the review.
The Samsung CF791 has excellent motion handling. It has a very fast response time and the backlight does not flicker when it dims. It supports the FreeSync implementation of the variable refresh rate (VRR) technology to smooth out gameplay on graphics intensive games.
The Samsung CF791 has an excellent response time. Setting the Response Time overdrive option to Faster provides the shortest response time. The Fastest settings has a better 80% response time, but it adds some considerable overshoot so we recommend the Faster setting.
The Samsung CF791 dims the backlight without using any PWM flickering. This helps motion be smooth and creates blur. On the other hand, there isn't any black frame insertion option available to add flicker in order to remove blur and make the image look crispier.
The Samsung CF791 has a remarkable refresh rate of 100 Hz, which is better than the common 60 Hz most monitors have but not as good as the 144 Hz of high-end gaming monitors. It also supports FreeSync so as to adjust the screen's refresh rate to the frame rate of a compatible graphics card and prevent tearing.
The monitor's FreeSync Ultimate Engine setting has a range of 100-48 Hz, which is wide enough for FreeSync's Low Framerate Compensation (LFC) feature to extend its effective range to below 20 Hz. Unfortunately the FreeSync Standard Engine setting only has a narrow 100-80 Hz range.
Unfortunately this monitor's FreeSync implementation has some bugs with how it interacts with some GPUs and graphics drivers. On our Radeon RX 580 test PC it was impossible to make FreeSync work properly over DisplayPort, even though it worked fine over HDMI, and worked fine over DisplayPort on our PC with an AMD Ryzen 3 2200G APU. Also the number of support forum threads about CF791 FreeSync issues is greater than for most monitors of similar popularity, with numerous reports of problems with certain Radeon driver versions and other issues (see our recommendations for the best Freesync monitors).
Update 01/15/2019: We have tested the Samsung CF791 with NVIDIA's new FreeSync drivers, on an NVIDIA GTX 1060 6 Gb. Unfortunately, there were a few issues. With the refresh rate set to 100 Hz, there was no signal when launching any Fullscreen games. It worked fine when we set the refresh rate to 60 Hz. It appears that NVIDIA ignores the window's refresh rate though, as the test pattern was then tear-free up to 100 Hz. We retested the CF791 on a Radeon card, and did not have the same issues.
The input lag of this monitor is okay, although most recent monitors like the CJ791 have lower input lag. On the other hand, this is a 34", 21:9 monitor with great resolution that will give you plenty of space and enough detail to work without issues.
Variable Refresh Rate tested over HDMI, all others tested over DisplayPort.
The input lag is worse than most monitors.
No non-native resolution is able to run at 100 Hz without using a custom resolution, though nearly all can run at 60 Hz. This isn't usually an issue though because most graphics cards upscale non-native resolutions by default.
The Game mode did not reduce input lag significantly as it was only 0.1 ms shorter with this setting enabled, so we recommend leaving the Game mode disabled for the better picture quality.
The Variable Refresh Rate (VRR) input lag was measured using the HDMI port, because our test PC had trouble with sending FreeSync over DisplayPort with this monitor; see the Refresh Rate box for more detail. We expect the DisplayPort to have the same VRR input lag, because with FreeSync disabled the input lag was the same (20.7 ms via DP, 21.7 ms via HDMI).
The Samsung C34F791 is a large 34-inch wide aspect ratio monitor. It has a great resolution that provides you with enough detail to do your work or gameplay.
The monitor's full 3440x1440x100Hz native resolution is supported over both DisplayPort and HDMI, which is great.
During testing we encountered some bugs with the monitor's HDMI ports. When changing between the monitor's HDMI 1.4 and HDMI 2.0 modes, sometimes the increased bandwidth of HDMI 2.0 wasn't detected by our PC until after the resolution was changed once. Also sometimes our PC became stuck at 640x480 or 1080p resolution when the HDMI mode was changed, though after a factory reset this issue never recurred.
The Samsung CF791 On-Screen Display (OSD) is easy to navigate due to a small joystick on the back of the monitor. The OSD has all the standard features of a monitor such as color settings and adjustable overdrive, etc. The monitor has internal speakers and this is a helpful feature.
The monitor is equipped with 2 internal speakers but does not support HDR.
Note: During general usage we noticed a bug with one of our PCs: when the PC made the monitor go to sleep it consistently made the PC crash (Blue Screen Of Death, BSOD). We didn't notice this problem on other PCs though.
The CF791 we bought is the 34" model (Samsung LC34F791WQNXZA).
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If someone's CF791 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.
The Samsung CF791 is a decent, large screen ultrawide monitor. See our recommendations for the best curved gaming monitors, the best gaming monitors for Xbox One X and the best ultrawide gaming monitors.
The Samsung CJ791 is better than the Samsung 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.
If you've got a large room with wide seating, then the Dell U3417W is a better choice, but if you're interested in gaming in a dark room while sitting directly in front, then the Samsung CF791 is better. The Dell U3417W has an IPS panel, giving you better viewing angles, whereas the CF791 has a slightly better refresh rate and a slightly faster response time resulting in clearer motion.
The LG 34UC79G-B is a better monitor than the Samsung CF791 for almost every use, unless you'll be using it in a dark room. The Samsung CF791 has better resolution giving you more details on the screen, but the LG34UC79G has better viewing angles and you'll enjoy gaming more as it has significantly better input lag and marginally better image flicker to clear blur.
The Samsung CHG70 is much better than the Samsung CF791. The CHG70 has much lower input lag, supports HDR, and is equipped with local dimming to make blacks even deeper. You can position it according to your liking and you'll enjoy it in every use. The CF791, on the other hand, is larger, giving you more screen area and more resolution to work with.
The two monitors are different types. For most people, the IPS panel LG 34WK95U is better than the VA panel Samsung CF791. The LG supports HDR, has better viewing angles, and has a lower input lag. On the other hand, the Samsung CF791 has better blacks and will perform better in a dark room.
The ASUS ROG PG279Q is a much better monitor than the Samsung CF791. If you play a lot of games, the ASUS has significantly better input lag, slightly better motion blur and supports G-SYNC to smooth out tearing. Also, the ASUS has better viewing angles, which is great if you wish to use it at the office.
The LG 32GK850G is better than the Samsung CF791. The LG 32GK850G has a faster pixel response time, and thus the blur trail in fast action content is smaller. The LG 32GK850G has a faster refresh rate and better input lag, and this is great if you play games. The LG 32GK850G also has better ergonomics that make it easy to place comfortably. The Samsung CF791, on the other hand, supports 4k resolution, is 2 inches larger, and has a curve.
The Samsung CF791 is somewhat better than the Dell D3218HN. The Dell has better viewing angles and is more suitable for collaborative work whereas the Samsung is larger and has a much better resolution that allows you to multitask better. The Dell D3218HN has lower input lag if you play casual video games, but the Samsung has a faster pixel response time that leaves a shorter motion blur, and faster refresh rate with FreeSync support to eliminate tearing.
If you want to work on the same monitor side-by-side with your colleagues at the office, then the Acer Predator XB271HU is a better choice than the Samsung CF791 as it has better viewing angles. The Acer is also better for gaming as it has better input lag, better image flicker to clear blur, and you can easily position it to match your liking. On the other hand, the Samsung CF791 is a larger monitor with higher resolution, giving you more area and more detail to work with.
The BenQ EW3270U is significantly better than the Samsung CF791. The BenQ EW3270U has better resolution, can display more detail on its screen, and supports HDR content. The EW3270U also has lower input lag and more uniform blacks. The Samsung, on the other hand, has a slightly faster pixel response time that leaves a smaller motion blur, and much better ergonomics to help you position it to your liking.