I'm considering replacing my Samsung T240HD 24" 1920x1200 TV-as-monitor with something like the Samsung UN43MU6290 but I am not entirely sure how these modern 4K sets are handling computer signals over HDMI. I know on Vizio I can turn off overscan and see the entire computer desktop environment. The 4K TV I am looking at doesn't have a DVI/DP input and so how Samsung handles signals across HDMI that are no STB/Blu-ray/Video consoles is a mystery.
Hopefully by the end of the day I will be able to load a couple of 3840x2160 resolution test patters using the USB inputs, which according to the manual suggest are treated just like HDMI in how image processing is handled. I do not own a laptop, let alone capable of 4K60 to bring into Costco to test and I am not inclined to 'buy-and-try' in an abusive return scenario. The Samsung 4K TV by default projects a scanned image beyond the bezel and one has to go into picture settings to enable Screen Fit, but I do not know if this is turning off scaling or turning it on in order to see the entire image within the bezel boundaries.
By the way, I am not includes to 'buy-and-try' as I am one of those people that do not returned things if they are working, and Samsung does not market their TVs as computer-usable displays anymore. And I have no reason to own a 4K display at this size for any other reason.