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To read about our monitor tests in-depth, please check out Display Testing Explained: How We Test PC Monitors. We cover brightness and contrast testing on page two.
Uncalibrated – Maximum Backlight Level
To find the 27GX790A’s highest possible SDR brightness, I set Peak Brightness on High and measured a 25% window pattern. At 415 nits, you’ll see bright highlights against a true black background, which means it, like all OLEDs, has infinite dynamic range. If you turn Peak Brightness off, making it constant, it tops out at just over 250 nits.
After Calibration to 200 nits
Calibration has no effect other than to reduce peak brightness to 200 nits. Refer to the table on the previous page to see what values I used with Peak Brightness set to High or Off. You can get 200 nits either way. Both static and intra-image contrast are the same unmeasurable value.
Test Takeaway: The 27GX790A is a bit brighter than most other comparable OLEDs and stands out by offering two levels of variable brightness. Other than that, it delivers the same contrast performance as any OLED, regardless of size or resolution.
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