Dell U3818DW Monitor Review

The stand is identical to the older U3417W. It has a unique trapezoid shape, and like most Dell stands, it is very slim, allowing you to place small objects directly in front of the monitor.

Mediocre ergonomics. The height of the monitor can be adjusted, and it can tilt and swivel, so you can easily turn your monitor for an impromptu meeting at your desk. The display can't be rotated, but with the large, curved design, you wouldn't really want to anyway.

The back of the monitor is very plain. Most of the inputs are grouped together near the center of the monitor.

The borders are thin and look good. They are the same thickness as the Dell U3417W, and slightly thinner than the ASUS PG348Q.

Because of the curved screen, the monitor looks thick when viewed edge-on. It is thinner than the U3417W due to the less aggressive curve. When VESA mounted, it is very thin, especially for a curved monitor this size (see our recommendations for the best curved monitors).

The Ultrasharp U3818DW is well built. There are no obvious build quality issues that could cause any issues.

The Dell U3818DW has a mediocre contrast ratio, but slightly better than the Dell U3417W. Unfortunately, there is no local dimming feature that could improve dark room performance.

Like the Dell U3417W, the contrast ratio was measured with Uniformity Compensation disabled. With this set to 'Calibrated', the contrast ratio is cut to 604:1.

There is no local dimming feature on this monitor. The video is for reference only.

The Dell Ultrasharp U3818DW is decently bright, and the brightness does not change with different content, which is great. It is a bit brighter than the Dell Alienware AW3418DW.

HDR is not supported on this monitor. If you want an ultrawide monitor with HDR support, check out the LG 38WN95C-W.

The monitor has good horizontal viewing angles. Given the size of the monitor, this is extremely important to ensure that the entire image remains uniform when sitting up close.

Excellent vertical viewing angles, typical of IPS panels. The brightness and colors shift at slightly narrower angles than the U3417W, but not enough to be noticeable or cause any issues. The black levels stay relatively flat at any angle, which is great.

The Dell Ultrasharp U3818DW has great gray uniformity. There are some dark vertical bands visible, but these are not noticeable under normal viewing conditions. There also isn't much DSE, which is great for browsing the web or watching streaming sports. Uniformity in near-dark scenes is much better, and there is almost no DSE.

Like the Dell U3417W, the gray uniformity was measured with Uniformity Compensation disabled. Setting this to 'Calibrated' did not significantly improve the uniformity, but cut the contrast ratio in half, so we don't recommend it.

Disappointing black uniformity. There is clouding visible across the entire screen, but not much flash-lighting, which is good. The photo is an overexposure designed to highlight clouding, in person, the Dell U3818W looks good in dark scenes.

The Ultrasharp U3818DW has outstanding accuracy out of the box. White balance and color accuracy dE are very low, and even enthusiasts likely won't be able to notice any inaccuracies. Gamma follows the target curve nearly perfectly, and the color temperature is only slightly cool.

The color accuracy and white balance are nearly perfect after calibration, but the Gamma is slightly worse. Color temperature is slightly warm after calibration.

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.

s.RGB Picture Mode: Custom Color (calibrated)
Adobe RGB Picture Mode: Custom Color

Excellent SDR color gamut. Standard s.RGB color space coverage is nearly perfect, but coverage of the wider Adobe RGB coverage is limited. Overall, the Dell Ultrasharp U3818DW is great for daily use, but isn't ideal for professional photo or video editing.

s.RGB Picture Mode: Custom Color
Adobe RGB Picture Mode: Custom Color

Excellent color volume. The U3818DW can produce bright colors across the s.RGB color space without issue. Unfortunately, it can't produce deep, dark colors in either color space due to the limited contrast ratio.

HDR is not supported on this monitor.

HDR is not supported on this monitor.

There are no signs of temporary image retention.

The monitor has great gradient handling. There is only minor banding in some dark colors, not enough to cause any issues.

There is no color bleed when displaying large areas of similar color.

Great reflection handling, similar to the AW3418DW. There should be no issues using this monitor in a bright room.

Response Time Normal
Response Time Fast

The monitor has a very good response time, slightly worse than the Dell U3417W. There are only two overdrive settings, and unfortunately in both modes there is significant overshoot in some transitions that causes smearing in motion that may bother some people.

If you want a monitor with faster response time, check out the LG 38GL950G-B.

The Dell U3818DW is completely flicker-free. There is no PWM flicker at any backlight level. There is also no option to introduce flicker to help clear up motion.

The Dell U3818DW has a standard 60 Hz refresh rate that is fine for most users, may disappoint more demanding gamers. There is also no FreeSync or G-SYNC VRR support.

Non-native resolution tested: 2560 x 1080 @ 8-bit.

Excellent low input lag. The Dell Ultrasharp U3818DW only supports non-native resolutions in 8-bit, but this shouldn't cause any issues if you want to use 10-bit, as most graphics cards will upscale without you knowing.

Non-native resolutions are only displayed when sending 8-bit, otherwise, they are displayed at the native resolution. Non-native input lag is ever so slightly higher, but still excellent.

The monitor has a great 38" screen and impressive 3840x1600 resolution. This rather uncommon resolution is sometimes known as WQHD+, and is great for multitasking, or for watching widescreen 4k content.

There is an audio line-out port, but it is meant to only be used for speakers, as the volume can't be controlled.

There are 4 USB 3.0 ports, and a USB-C port that can be used with DisplayPort Alt mode, allowing you to connect a laptop to the monitor and charge it with a single cable. USB Power Delivery mode on the U3818DW can deliver up to 95W of power.

Unlike the U3417W, the U3818DW does not have a DisplayPort out, so it can't be daisy-chained with another monitor.