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System latency is a new addition to our testing, where we use Nvidia’s Latency and Display Analyzer Tool (LDAT) to measure end-to-end system latency. LDAT itself is a photosensor which is placed on the monitor. It has an integrated mouse button, allowing it to measure the total time taken from mouse click, to an action happening on screen, which is done by measuring a change in luminance. This data is logged to a CSV file over USB, allowing for close analysis of the data.
As this is end-to-end system latency, we are not measuring only the processing/input latency of each monitor we test. However, we can standardise the test process so the monitor is the only variable. It also gives an insight into how different refresh rates and resolutions can affect end-to-end latency, which is of course highly relevant to your purchasing decision.
We use Rainbow Six Siege for this testing. We recently changed the graphics settings we test at, to allow for higher frame rates, so the Xeneon is only the fourth monitor overall we have tested with LDAT using these settings, and the first QHD screen we have tested. That means we currently have limited comparison data, but we will add to these charts as we review more screens.
System latency averaged 9.2ms with the Xeneon 32QHD165, about 4ms faster than the like of the AOC U28G2XU and Eve Spectrum. Those are 4K monitors however, so we'd expect lower latency from this QHD panel, but it's good to see that is indeed what was measured.
