This review is based on my experience with the Asus PA248Q and Dell 2412M monitors. I'll focus on aspects that no spec website will tell you about. Introduction: I started with two Asus PA248Q monitors. One fell victim to a known flickering issue so I sent it back and paired it with a Dell U2412M with the intention of using both. However, I'm returning the Asus PA248Q now, mainly because I found it had more input lag than the Dell. Input Lag: I cloned both displays and ran a timer to check for input lag and took a picture of both screens with my DSLR. and Dell was noticeably faster. I even hooked up my old Dell ST2010F TN monitor and compared it to the U2412M and they had the same input lag. Obviously, input lag is not an advertised statistic. In any case, while the Dell U2412M has a faster response time than the Asus (as a small difference), the Asus has more input lag. The Asus lags behind when raising and lowering the window split between the bezels of the Asus and Dell, resulting in a sort of "catapillion" effect between the two. The PA248Q is made much stronger. The base is bigger and heavier and doesn't wobble. On a stable table, however, both monitor stands work without any change after the intended adjustment. Color Quality: The Asus PA248Q looks better out of the box. It's apparently pre-calibrated from the factory, even includes a calibration certificate, and it shows; both Asus PA248Q monitors looked 100% the same. The U2412m reportedly has a possible "yellow cast" issue and while I feel like I have such a monitor, I was able to adjust the yellow cast (compared to the PA248Q). Both monitors have a color quality that I can call completely the same after adjustment. IPS lights: Both the Asus PA248Q and Dell U2412M have the same amount of IPS lights, but the Dell has a warmer glow on the left and a cooler glow on the right. Asus appears to be about the same on both the left and right sides, but even so, the glow is the same. There's "a lot" of glow, but that's to be expected from an IPS monitor in this price range. Anti-glare coating: Both the Asus PA248Q and the Dell U2412M differ slightly in terms of anti-reflective coating. The general perception is that Dell has more, but I don't see that. Physical chassis: The Asus is much more rigid with sharp edges and all black, while the Dell is "smooth" with more rounded edges, including the frame corners, and a gray accent color. In general, Asus looks more "industrial". Asus has etched some measurement indicators into the front of the monitor, which I'd consider useless considering you'll be using on-screen measurements from the measurement software. This appears to be a gimmick that only exists because of the "ProArt" name that Asus owns. OSD Menu: The Asus PA248Q has a small joystick for menus, and while this seems great for navigating, it feels unnecessarily complicated. Thing for such a simple menu. Dell has unlabeled keys that are "labeled" after the OSD opens and displays on screen, and navigating them is extremely easy with no chance of hitting the wrong key. Because of this, I see Dell having a much cleaner menu and physical set of buttons. Aspect Ratio Control: The Asus PA248Q can display a 1:1 aspect ratio, while the Dell U2412M does not. BUT THE QUALITY IN THIS SETTING WHEN DISPLAYING NON-NATURAL 1:1 RESOLUTION IS ACTIVELY REDUCED ON ASUS PA248Q. If 1:1 is enabled and the PA248Q displays as such, e.g. 1920 x 1080, the monitor will automatically lose its sRGB setting and use Standard by default (and will need to be manually reset to sRGB when finished). On top of that, the screen quality becomes blurry and a bit unstable. This is a complete joke with a 1:1 setting and is only useful if you are either sitting very far away from the monitor or you just don't care. I had 1:1 aspect ratio control on other monitors that didn't have this loss of quality. For this reason, the fact that the U2412M doesn't have 1:1 aspect ratio control is irrelevant as the PA248Q may not exist either. force meter. In the Asus PA248Q OSD there is an option to completely turn off the power indicator in the lower right corner of the monitor. Dell doesn't have that option, but the light isn't intrusive. Nevertheless, I would prefer this variant. Conclusion: The better packaged Asus PA248Q offers a better colored display and a more even IPS glow at the expense of a higher input lag than the Dell U2412M. The Dell is better for gaming simply because of the lower input lag, and the Asus is better for precision photo editing because it's factory precalibrated, although you can calibrate the Dell too if you have the hardware. The Asus PA248Q may have a flickering issue (search for this issue and you'll see), which is a major defect, while the Dell U2412M may have a "yellow cast" issue that I seem to have yet to discover. Buying monitors is fraught with risks left and right, with the pros and cons of different models and the ability to stick pixels on any of them. Much luck. UPDATE: I bought a second Dell U2412M; There's still no 'yellow cast', but the monitors' colors are definitely not the same and will require adjusting the settings to be similar. Asus PA248Q monitors are pre-calibrated for a perfect match right out of the box.
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