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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 GB2770QSU is only the fifth monitor overall we have tested with LDAT using these settings, and the second QHD screen we have tested. That means we currently have limited comparison data, but we will add to these charts as we review more monitors.
Total system latency came in at 8.9ms over our testing, which is 0.3ms lower than the Corsair Xeneon 32QHD165, and there was certainly no noticeable input delay that I could detect. It's a good result and we'll be adding to this chart in the future to see how it stacks up against other QHD displays.
