The Samsung C34J791 is a 34'' ultrawide monitor with mediocre picture quality. It has a high contrast ratio due to its VA panel and displays deep but not too uniform blacks. It's more suitable for an average-lit room as it can't get very bright to fight bright room glare. It has great gray uniformity, which is great for browsing the web, but the bad viewing angles make it unsuitable for working side by side with a colleague. It has great motion handling with a fast 100Hz refresh rate, supports FreeSync, and has a low input lag to please gamers.
This is a newer version of the Samsung C34F791/CF791.
Our Verdict
The Samsung C34J791 is a decent monitor for mixed usage. It has a large ultrawide screen with ample resolution that favors multitasking, but unfortunately, it has poor viewing angles. It's very responsive to your actions, but avoid placing it in a very bright room as it can't fight bright room glare.
- Excellent low input lag.
- Excellent resolution and size.
- Image degrades when viewed at an angle.
- Lack of HDR support.
This is a monitor with decent performance for office use. Its large screen size and great resolution will allow you to do more at the same time, but unfortunately, the poor viewing angles and bad ergonomics won't make it easy to share your work with your coworkers.
The CJ791 is a very good gaming monitor. Its low input lag and excellent resolution and size offer an immersive gaming experience. It supports FreeSync so you can strain your graphics card without worrying about tearing. The fast response time ensures a crisp image with little motion blur in fast-action games.
This is a decent monitor for multimedia. The large screen size and excellent resolution enable the monitor to display much of the multimedia content at its native resolution. However, the best picture quality is reserved for those seated directly in front since the viewing angles are bad.
The Samsung C34J791 is a decent monitor for media creation. The large size and excellent resolution are ideal if you open many windows at the same time, but the bad viewing angles and poor ergonomics will trouble you, especially if you wish to work side by side with a colleague. However, if you work alone, you will appreciate the monitor's responsiveness due to the low input lag and the crisp image, thanks to the fast response time.
Unfortunately, the Samsung CJ791 doesn't support HDR like the Samsung CHG70.
Changelog
- Updated Aug 16, 2019: We remeasured the 60Hz input lag, as the previous measurement is impossible. We've updated the input lag measurements and the score.
- Updated Jan 22, 2019: Review published.
- Updated Jan 20, 2019: Early access published.
- Updated Jan 18, 2019: Our testers have started testing this product.
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Differences Between Sizes And Variants
The Samsung CJ791 we bought is the 34" model (Samsung LC34J791WTNXZA).
If someone comes across a different type of panel or if their CJ791 doesn't correspond to our review, let us know, and we'll update the review. Note that some tests, like the gray uniformity, may vary between individual units.
| Model | Size | Native Resolution | Refresh rate | Notes | Year |
|---|---|---|---|---|---|
| CJ791 | 34" | 3440x1440p | 100Hz |
FreeSync and Thunderbolt 3 support |
2018 |
| CF791 | 34'' | 3440x1440p | 100Hz | FreeSync support | 2016 |
Note: The CJ791 we purchased was manufactured in August 2018.
Popular Monitor Comparisons
The Samsung C34J791 is a large-screen ultrawide monitor that is great for gaming.
See our recommendations for the best ultrawide monitors, the best gaming monitors, and the best 34-49 inch monitors.
The LG 32UD99-W is significantly better than the Samsung C34J791/CJ791 for most people in the majority of uses. The LG has better viewing angles, due to the IPS panel, better ergonomics, can get brighter, supports HDR, and has a 4k resolution. The Samsung CJ791 has a VA panel and slightly better blacks. It also has a faster refresh rate, a lower input lag, and a curve profile for those who like it.
The ASUS ROG PG348Q is better than the Samsung C34J791/CJ791 if you care about good viewing angles. The ASUS ROG PG348Q has an IPS panel whereas the Samsung has a VA one. The ASUS also has a faster response time with a smaller blur trail and better ergonomics to position it comfortably. The Samsung CJ791, on the other hand, has a lower input lag which makes it very responsive to your actions.
The Acer Predator Z35P Bmiphz is better than the Samsung C34J791/CJ791. The Z35P has better ergonomics than the Samsung and allows you to place in a comfortable position with ease. Also, the image remains accurate at slightly wider horizontal and vertical viewing angles on the Acer, although they are still disappointing.
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.
We buy and test more than 30 monitors each year, all of which we purchase ourselves, without cherry-picked units or samples. We put a lot into each unbiased, straight-to-the-point review, and there's a whole process from purchasing to publishing, involving multiple teams and people. We do more than just use the monitor for a week; we use specialized, custom tools to measure various aspects and deliver objective, data-driven results. We also consider multiple factors before making any recommendations, including the monitor's cost, its performance compared to the competition, and whether it's easy to find.
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