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Monitor response time testing is a new addition to our reviews, where we use the Open Source Response Time Tool (OSRTT), developed by TechTeamGB. This measures grey-to-grey response times and presents the results in a series of heatmaps, the style of which you may be familiar with from other reviews.
Initial Response Time is the time taken for the panel to transition from one colour to another, where lower values are better. We present the initial response time, so overshoot is not taken into account and is measured separately. We use a fixed RGB 5 tolerance for each transition.
Overshoot is the term given for when a monitor's transition exceeds or goes beyond its target value. So if a monitor was meant to transition from RGB 0 to RGB 55, but it hits RGB 60 before settling back down at RGB 55, that is overshoot. This is presented as RGB values in the heatmaps – i.e. how many RGB values past the intended target were measured.
Visual Response Rating is a metric designed to ‘score' a panel's visual performance, incorporating both response times and overdrive. Fast response times with little to no overshoot will score well, while slow response times or those with significant overshoot will score poorly.
We test the AG276QZD at 240Hz, 120Hz and 60Hz.
As with any OLED monitor, we get fantastic response times from the AG276QZD, averaging around the 1ms mark regardless of the refresh rate used.
However, we know that such fast response times doesn't mean motion clarity will be the same regardless of refresh rate – 240Hz offers a noticeable improvement in clarity versus 120Hz, which itself is a mile ahead of 60Hz.
You may be wondering how this 240Hz WOLED compares with the latest 360Hz QD-OLEDs too, so once again I've brought in the MSI MPG271QRX that I reviewed recently. I honestly don't think it is a massive difference, but you can see the 360Hz image is just that bit clearer – particularly when looking at the white lines on the UFO, and the alien's face. However, this 240Hz WOLED still offers better clarity than a 360Hz LCD, in the form of MSI's Oculux NXG253R, so it's very impressive overall.
Overall then, the AG276ZQD delivers response times that are right up there with all the OLED monitors I have tested, and it's significantly faster than the next-best LCD screen.
