That resolution is not supported over HDMI higher than 30 Hz, as far as I can tell. It does reach 59/60 Hz with the DisplayPort input, though.

The LG 27" Class 4K UHD IPS LED Monitor (27" Diagonal), Model # 27UD59-B is a VESA® compliant monitor that has a VESA® Wall Mount Interface pattern of 100 x 100 mm. ITs W x H x D dimensions are 24.9" x 14.8" x 2.4". If your twin monitor VESA® stand supports that VESA® Wall Mount Interface pattern then it can be used to mount the monitor. If you intend to mount two of these monitors, check the dimensions to make sure that your twin monitor VESA® stand will accommodate two monitors with those dimensions...^IFV

That will depend on what your criteria is for a monitor that you need for what type of graphic design work you're doing. The LG 27" Class 4K UHD IPS LED Monitor (27" Diagonal), Model # 27UD59-B is an AH-IPS monitor so unlike monitors with TN panels which have a restricted viewing angle, especially vertically and exhibit contrast and color shift issues, AH-IPS (Advanced High-Performance IPS) monitors have wider viewing angles and can reach contrast ratios of up to 1000:1 - 1100:1. They produce more stable images with less contrast/color shifts across the panel and are free from off-center contrast shifts when viewed from an angle. The 27UD59-B is a 10-bit ((8bit + A-FRC) panel that covers 72% of the NTSC Color Gamut (CIE 1931) and about 99% of the sRGB Color Gamut. It has a resolution of 3840 x 2160 which is ideal if you're doing highly detailed work. It has a Pixel Pitch of 0.1554mm x 0.1554mm and a pixel density of 163 ppi, a Brightness of 250 cd/m2 and a Contrast Ratio of 1000:1 with a horizontal and vertical viewing angle of 178˚. The stand is not height adjustable, but you can tilt the monitor forward by 2˚ or backward by 15˚...^IFV

Hi Leon1957. Google made the YouTube TV app available to 2016 and 2017 LG TVs running the webOS platform as of Oct, 2017. On LG models, you will need to navigate to the LG Content Store, search for YouTube TV, and then download the app. Model # 32LJ550B and Model # 32LJ550M are both webOS 3.5 models that feature the LG Content Store (App Store) that you can use to search for and download the app with...^IFV

A side by side comparison of the two models can be made from our website here: http://www.lg.com/us/compare/compare.lg?category=/us/monitors For additional monitor support reach out to a computer specialist by calling 800-243-0000. ^CP

The 27UD59-B does not have that feature. ^AC

We are only able to support products in the USA. For the proper support channels, please see- www.lg.com/in/support ^CP

There is the 58, 59 and 60 models. The 58 has a much better stand that allows for vertical viewing, tilt and swivel. The 59 and 60 are the same except for the release date or to the stores for which they are sent.