What is 4K Ultra HD?

4K Ultra HD can generally refer to one of two high definition resolutions.  Most commonly 4K Ultra HD refers to 3840 x 2160 pixels (referring to the approximately 4000 pixel wide display), which has exactly twice as many pixel rows and columns as 1080p (1920×1080 pixels), and four times the overall pixel count, with the same 16:9 aspect ratio. 4K Ultra HD can also refer to the currently less common 4096 x 2160 pixel resolution.


Although 4K TVs are very common, 4K monitors are just becoming mainstream. Whether you’re looking for a better multitasking experience for work or just looking for a more immersive gaming experience, 4k monitors have a lot to offer. Although they used to be very expensive, they dropped recently as 4k became more popular and more devices supported it.

Multiple monitors tested

  • Display purchased by the store; unit without picking cherries
  • Retest after major update
  • Easy to compare results
  • No ads; unbiased comments

LG 27UK650-W- Best 4k Monitor



LG 27UK650-W

Size : 27 ”  Resolution : 3840×2160  Refresh Rate : 60 Hz  

LCD Type  : IPS  Variable Refresh Rate  : FreeSync


The LG 27UK650 is the best 4k monitor we’ve tested so far. Overall, it provides good image quality with excellent gray uniformity, wide viewing angles and excellent SDR peak brightness. It has excellent motion handling with excellent response time and flicker-free backlighting.

Players will appreciate the 27UK650 FreeSync support, which also works on NVIDIA NVIDIA 10 and 20 Series graphics cards with NVIDIA’s new Adaptive Sync drivers. It also has an excellent low delay, even when displaying a non-native resolution or when playing in HDR.

Unfortunately, the 27UK650 does not look so good in dark rooms and HDR content does not look too good due to the mediocre contrast ratio and the lack of a large color gamut. Overall, the UK650 is a very good 4k monitor that should appeal to most people.

LG 32UD99-W- LARGER ALTERNATIVE


LG 32UD99-W

Size : 32 ”  Resolution : 3840×2160  Refresh Rate : 60 Hz  

LCD Type  : IPS  Variable Refresh Rate  : FreeSync


If you like the LG 27UK650 but are looking for a larger screen, try the LG 32UD99 instead. The larger 32-inch screen is ideal for multitasking and the 32UD99 is almost identical to the smaller model. It has a slightly better color space and can represent a large color space in HDR. Thanks to the included it is also better connected to the Internet USB hub, which can be used to connect and charge your accessories, with only one cable leading to your computer.

LG 27UD58-B- CHEAPER ALTERNATIVE


LG 27UD58-B

Size : 27 ”  Resolution : 3840×2160  Refresh Rate : 60 Hz  

LCD Type  : IPS  Variable Refresh Rate  : FreeSync


If you find the LG 27UK650 out of your budget and still need a decent 4k monitor that will not break the bank, then you should take a look at the LG 27UD58-B. It’s a 4K monitor with decent picture quality and an IPS panel that offers a wide viewing angle. It has a standard 60Hz refresh rate, low input delay, supports FreeSync and is great for gaming. It does not have the versatile base of the 27UK650, but a fixed one that allows for minimal adjustments. HDR is not supported. It can not get too bright and is therefore not suitable for a room with plenty of natural light. Overall, most people will be satisfied with their choice.

Acer Predator X27- Best 4k Monitor For HDR


Acer Predator X27

Size : 27 ”  Resolution : 3840×2160  Refresh Rate : 120 Hz  

LCD Type  : IPS  Variable Refresh Rate  : G-Sync


If you want the best HDR experience, or often work in the wider Adobe RGB color space, the Acer Predator X27 has the widest color gamut of any previously reviewed 4k monitor. It’s also extremely bright and has excellent motion handling, making it one of the most versatile monitors we’ve ever tested.

The X27 has an excellent wide color gamut, even better than most televisions, and covers almost 100% of the Adobe RGB color space. This makes it ideal for professionals working in the printing or marketing industry. It has excellent wide viewing angles and excellent HDR support. The monitor also supports G-SYNC, but like all current 4k monitors, it is limited to an update rate of 60 Hz.

Unfortunately, the Acer Predator X27 does not look very good in dark rooms. It has a disappointing natural contrast ratio, so that blacks appear gray in a dark room. Although it has a local dimming function, it is not very effective. Although the X27 is very expensive, it is a great monitor that should appeal to most people.

LG 32UD59-B- Best 4k Monitor For A Dark Room


LG 32UD59-B

Size : 32 ”  Resolution : 3840×2160  Refresh Rate : 60 Hz  

LCD Type  : VA  Variable Refresh Rate  : FreeSync


If you’re looking for a monitor that performs well in dark rooms, check out the LG 32UD59-B. It’s a subtle 4K monitor that delivers deep blacks in dark rooms thanks to the high contrast ratio and discreet black uniformity of the VA panel. It has a low input delay and supports FreeSync for a tearing-free gaming experience.

The image quality of the 32UD59-B is neat, but the monitor can not get very bright to overcome the glare of the room. Therefore, it is particularly suitable for dark rooms. It does not support HDR content and due to its VA panel, the image deteriorates when viewed from the side.

All in all, it’s a decent 4K monitor that should appeal to most buyers.

Notable Mentions

  • Dell U2718Q:  Very good 4k monitor, but the LG 27UK650 is better overall.
  • LG 27UD68-P: Good 4k monitor, but the LG 27UK650 is better overall and supports HDR.
  • LG 43UD79-B:  Decent large 4k monitor, but the LG 32UD99 is much better overall.