There was plenty of brightness, more so than we usually see with ULMB, whilst 144Hz was also supported to give a bit of a boost over 120Hz. Pixel responsiveness was nicely tuned as well, with the vast majority of pixel transitions were performed fast enough for optimal 240Hz performance. Although we had no cause to use them in our testing, 3 gamma settings are included as well so users can adjust this to a degree if they’re unsatisfied with the default setting.This is clearly a monitor built for speed, though, and really it was very impressive in terms of responsiveness. April 18, 2017 This is most noticeable at 100Hz, but still noticeable at higher refresh rates (sensitivity varies). Overall, though, the monitor was quite well set up out of the box. This strobing behaviour greatly reduces the amount of time that your eyes spend tracking motion on the screen. The right side of the screen features some ports; 3.5mm microphone jack, 3.5mm headphone jack and 2 USB 3.0 ports (the top one featuring fast-charging). Car tire tread patterns, for example, looked very distinct when displayed at the bottom of the screen but completely indistinct near the top. This was due in large part to the gamma, which averaged 2.2 rather than something much lower. We refer to this as ‘TN glow’, which isn’t visible from a normal viewing position and is never as intense as ‘IPS glow’ from a given viewing position. Test SettingsFor our ‘Test Settings’ we lowered the brightness and made some changes to the colour channels. Then again, for competitive gamers or those whom value responsiveness above all else this monitor is certainly a strong contender. All of these viewing angle characteristics are typical for TN models. Below this G-SYNC operates as normal, whereas above this a special version of VSync called ‘Fast Sync’ is activated. The following observations were made from a normal viewing position, eyes around 70cm from the screen. There were no obvious weaknesses in pixel responsiveness nor any obvious overshoot. Last but not least; the ‘connected feel’ isn’t as good at 144Hz as it is at 240Hz. Where applicable, shots are provided for reference from a Dell S2417DG. Most users will find the clarity to be excellent even with the default setting of ‘100’, but given the fairly high brightness potential even with ULMB on this monitor, you may like to experiment with lower settings. The time in milliseconds that the display needs to visualize the signal input. This did indeed prevent tearing or stuttering from mismatches in the two, but the experience was quite painful to endure due to obvious lack of fluidity. This film has a lot of high-contrast scenes in it, whereby bright elements such as explosions and light sabers light up much darker surroundings. It was very capable of delivering a solid 240Hz performance, with little compromise, for users of both AMD and Nvidia GPUs. The following table shows the deviation between each point and the brightest recorded point. sRGB3490.38918Color Temp. Nvidia G-SYNC is a variable refresh rate technology that can be activated when specific compatible Nvidia GPUs are connected to compatible monitors (such as the AOC AG251FG). There’s also a tilt indicator. The green camp can also benefit from G-SYNC or ULMB, which are of course key features of the monitor. We found the benefits shared amongst all of the game titles we tested, really, so will simply be focusing on Battlefield 1 (BF1).At 240Hz, without ULMB active, and provided the frame rate was suitably high, levels of perceived blur were already very low. ULMB – the experienceAs soon as ULMB is active, the aforementioned flickering sets in. The pixel responsiveness remained quite well tuned even as frame rate dropped, too, free from obvious overshoot. Firstly; there is a significant increase in the levels of overshoot compared to the optimal ‘Overdrive’ setting we used for our earlier testing. The screen flickers at a frequency matching the refresh rate of the display (i.e. Very bright and a look verging slightly on the warm side. With ULMB active, you can see that the object itself is exceptionally crisp and detailed, getting progressively more so as refresh rate is increased. When the two are in sync it gets rid of the tearing (VSync off) and stuttering (VSync on) that occurs when the two are desynchronised. Our favorite feature from the package is the nifty remote accessory for conveniently navigating the already well-laid out OSD. This film has a lot of high-contrast scenes in it, whereby bright elements such as explosions and light sabers light up much darker surroundings. There is no such thing as 240Hz ULMB on this monitor, so that is another sacrifice that users would have to make if they opt for ULMB. This was a very short, sharp and faint trailing that would escape the notice of most users and do little to impede their gaming enjoyment. We’d also like to add that the monitor was free from obvious overshoot even as the frame rate dropped, which is something we often see on G-SYNC models but not necessarily FreeSync models. ConclusionHaving tested a number of monitors with ever-increasing refresh rate, it’s quite interesting to see what exceptional refresh rates like 240Hz really bring to the table. The alternative operating mode for the very lowest levels of perceived blur, ULMB, also featured. Although the gamut coverage for the AOC Agon AG251FZ is slightly lower than its competitors like the ViewSonic XG2530 we recently reviewed, it would be difficult to discern the difference which is only noticeable if you have them together and look hard enough. Then again, the removal of tearing and stuttering was of considerable benefit as well. We found ‘Use the 3D application setting’ and selecting the option in-game works exactly as it should.The ‘Fast’ option is available on some newer GPUs, such as the GTX 1070 used in our test system. There are several drawbacks to using ULMB, aside from the flickering – which some competitive gamers who gave for hours on end would not abide anyway. A good thing to focus on to get an idea of the clarity increase as refresh rate is increased is the triplet of white blobs on each segment of the UFO. As above but brightness slightly higher and flickering slightly more noticeable due to decreased refresh rate (120Hz). This model clocks in at only 3.6ms of delay at its peak with the Low Input Lag option under Game Settings turned on. The AG251FZ has several external input ports, but also has dedicated USB 3.0 and device-charging ports, making it easy for you to charge your mobile device or transfer data while focused on your gaming session. Colour reproductionColour gamutThe colour gamut of the AG251FG (red triangle) was compared with the sRGB reference colour space (green triangle), as shown in the image below. AOC AGON AG251FZ. I can not turn off the amd freesync when working with the amd r9 290x video card. The lack of tearing and stuttering was still a nice addition, though. Enable G-SYNCNext you should navigate to ‘Manage 3D settings’. Having to cycle the setting from ‘0’ to ‘20’ when you want to activate it fully, and vice-versa, is a bit cumbersome. For competitive gamers, though, the edge in terms of connected feel and lower perceived blur will be welcome. And indeed the ‘Light’ setting provided a decent performance regardless of refresh rate. Ensure that the checkbox for ‘Enable G-SYNC’ is checked, then select your preferred operating mode. The image appears much richer than on many high refresh rate TN models out of the box, however. But first, we’ll consider other attributes which we consider important – those related to static image quality. The preference for ULMB over G-SYNC, or the other way around, is quite an individual one. There were only a few minor weaknesses, but nothing that hampered our enjoyment of the exceptionally fluid 240Hz experience. So a nice but not exactly huge benefit there. Over 30 repeat readings were taken to help maximise accuracy. It’s very important to realise, though, that they were so minor that we had to concentrate to find them and would usually crash the car in the process. The ‘Medium’ setting yields further improvement at 60Hz, with the trailing as good as eliminated really. Some temporal dithering could be seen on some of the mid tones and darker tones, but it was quite well masked and not too obvious. It all looks rather fast on paper, but as we know all too well simply on-paper specifications can be quite misleading. Essentially the technology allows the monitor to dynamically adjust its refresh rate to match, where possible, the frame rate outputted by the GPU. AOC AGON AG273QCG. I can not turn off the amd freesync when working with the amd r9 290x video card. These simply adjust the settings available to the user to various preset values. PositivesNegativesGood default setup without problematic central gamma, avoiding the ‘washed out look’ of many of its 144Hz counterparts The usual TN viewing angle limitations, which affect colour consistency and affect perceived gamma and saturation and different areas of the screen Decent contrast performance overall, as expected for a TN model with a reasonable static contrast ratio and no ‘IPS glow’ to hamper the experiencePerceived changes in gamma affect visibility in dark areas at different points of the screen. Very similar to factory defaults, but many controls are now disabled (including brightness, which is set at a very bright setting). There were perceived gamma shifts even from a normal viewing position, though, which revealed extra detail in dark areas lower down the screen. It just kept things flowing and was nice to have. We’ve also included the ‘Overdrive’ setting and refresh rate used in Windows, just for reference. To wrap up this section, we certainly enjoyed the addition of G-SYNC of this monitor and found it beneficial regardless of frame rate. Set Monitor Technology to ULMBThe first sign that ULMB has activated successfully is that the screen will begin to flicker at a frequency matching the refresh rate, just like an old CRT. ‘Full’ gave obvious oversaturation and bleaching, whereas the image was displayed correctly with ‘Limited’ selected.

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