On-Screen Display and Monitor Functionality
Even though the buttons on the side of the ASUS PQ321Q are dreadful, you are going to have to use them to access the on-screen display. Some of the functions and features that you can modify in here are pretty important, so I wanted to walk you through some of the options offered.
The picture menu are where you can change the standard settings for brightness, contrast, black level, etc as well as get into the more advanced settings like color adjustment and the RGB input range. While the color adjustment is defaulted to sRGB, you can go manual and edit white balances and gamma corrections.
The Setup menu will be used more frequently for the input selection and DisplayPort STREAM options that are found here. The audio input level can be adjusted if you are connecting something to the rear input but in reality I hope you are not going to depend on the very small 2 watt speakers included on the PQ321Q. Here, you can also change which audio inputs are associated with each video input as well.
Under the input selection settings you can set either PC or AV for the separate HDMI inputs, but more importantly you can enabled or disable the HDMI Dual option. When enabled this will tell the monitor to treat both HDMI inputs as coming from a single output and form a single image as a result. This DOES require some special support from the graphics card drivers for both AMD and NVIDIA (more on that later in the review) but when properly configured you can still run both heads at 60 Hz.
The most important setting in the menu is the ability to switch between SST and MST modes for DisplayPort connectivity. Single Stream Transport and Multi-Stream Transport tell the display what to expect from the graphics card and what the monitor EDID will send over the DP connection to the PC. Essentially, in MST mode, the display and graphics card are able to transmit the data for two separate display heads over a single cable. The PQ321Q essentially has two virtual monitors residing in its housing and the PC will see it as such. This is the magic that allows 60 Hz at 4K resolutions with today's technology.
By enabling SST mode though you can connect a single HDMI cable or use DisplayPort to run more standard resolutions like 1920×1080 or even 3840×2160 at 30 Hz.
We'll talk about the configuration and setup side for this on a following page.
Here you can inform the display as to whether it is in landscape or portrait mode and tell it when it can turn itself off with no activity.
Finally, under the Others panel we find miscellaneous options for screen motion (residual image protection), power management and even how the panel should handle native 4096×2160 inputs (by centering it or cutting either side off).