AOC Agon Pro AG456UCZD 45-inch ultra-wide OLED gaming monitor review: Extreme curve and speedy performance

45-inch 21:9 OLED display with an 800R curve, WQHD 3440x1440 resolution, 240 Hz, Adaptive-Sync, HDR10 and wide gamut color.

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AOC Agon Pro AG456UCZD
Editor's Choice
(Image: © Tom's Hardware)

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Uncalibrated – Maximum Backlight Level

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AOC Agon Pro AG456UCZD
(Image credit: Tom's Hardware)

The AG456UCZD's variable brightness feature is turned on by default. That means the brightness of a 25% window is greater than that of a full-field white pattern. Should you prefer constant brightness, that option is available and results in a peak white reading of 256 nits. Either mode is bright enough for an indoor environment. Turning Constant Brightness on only limits the peak number, not contrast. That is still unmeasurable due to the completely black screen displayed under zero brightness conditions.

After Calibration to 200 nits

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AOC Agon Pro AG456UCZD
(Image credit: Tom's Hardware)

Calibration does not affect contrast or black levels in any way. Since the AG456UCZD is bright enough with Constant Brightness turned on, that’s the way I would use it for SDR. Turn it off for HDR to enjoy brighter highlights. There is no difference between any of these screens in the static or ANSI (intra-image) tests. Once brightness is equalized, they deliver the same dynamic range and unmeasurable black levels.

Test Takeaway: The AG456UCZD’s variable brightness feature is a bit more aggressive than average which is the reason for its high peak white level. This is great for a bright image but can be fatiguing in the long term. AOC provides a choice with its Constant Brightness option, something many OLEDs don’t offer. Either way, it delivers tremendous contrast and a stunning image.

Christian Eberle
Christian Eberle
Contributing Editor

Christian Eberle is a Contributing Editor for Tom's Hardware US. He's a veteran reviewer of A/V equipment, specializing in monitors. Christian began his obsession with tech when he built his first PC in 1991, a 286 running DOS 3.0 at a blazing 12MHz. In 2006, he undertook training from the Imaging Science Foundation in video calibration and testing and thus started a passion for precise imaging that persists to this day. He is also a professional musician with a degree from the New England Conservatory as a classical bassoonist which he used to good effect as a performer with the West Point Army Band from 1987 to 2013. He enjoys watching movies and listening to high-end audio in his custom-built home theater and can be seen riding trails near his home on a race-ready ICE VTX recumbent trike. Christian enjoys the endless summer in Florida where he lives with his wife and Chihuahua and plays with orchestras around the state.