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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 FV43U is the first monitor we have tested with LDAT using these settings. That means we currently have no comparison data, but we will add to these charts as we review more screens.
As we can see, average end-to-end latency hitting 19.3ms, which sounds like what we'd expect from a decent display. In any case, I really had no issues with input lag, I played several rounds of Call of Duty and it didn’t feel like there was any processing delay at all, so there’s no complaints from me.
