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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
The 45GX950A is very bright, especially given its large size. It draws a bit more wattage than its competitors to achieve this, but it’s worth it for that 457 nits for SDR content. That’s the maximum value with the Peak Brightness option set to high. If you turn PB (variable brightness) off, the peak is around 285 nits. Like all OLEDs, black levels and contrast cannot be measured.
After Calibration to 200 nits
Calibration changes nothing about black levels or contrast; they are still unmeasurable. For SDR content, I preferred Peak Brightness off, which is equivalent to constant brightness. When watching videos, PB Low improves the image a bit with brighter highlights. PB High is the go-to for HDR content.
Test Takeaway: The 45GX950A delivers typical OLED SDR brightness and contrast, with output over 450 nits and perfect black levels. It includes variable brightness, which not all OLED monitors have, and you get two settings — a point in its favor.
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