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The MO34WQC2 supports HDR10 signals by switching automatically. There are no picture controls available except for APL Stabilize which should be set to High for the best HDR image.
HDR Brightness and Contrast
Any OLED monitor will deliver great HDR which makes peak brightness the only major differentiator. The MO34WQC2 isn’t as bright as some others, like the Asus and AOC, but it is still very satisfying to look at. The large color gamut gives it an edge over brighter displays. To measure 442 nits, I used a 25% window pattern. Smaller windows would likely yield higher luminance numbers.
Grayscale, EOTF and Color
The MO34WQC2 continues its spot-on color in HDR mode with a perfect grayscale run. There are no errors higher than 1dE which is stupendously good. I can’t fault Gigabyte for leaving out HDR calibration controls because they are obviously unnecessary. The EOTF trace starts out a bit dark before it meets the reference line and transitions smoothly to tone mapping at 65%. This is a good result.
The HDR color test shows the MO34WQC2 using its large color gamut to full advantage. The DCI-P3 chart is generally over-saturated to about the same level as I saw in SDR mode. Target points are linear so there is no loss of clarity or clipping of detail. The BT.2020 chart shows the same behavior until it hits the color limit at 90% red, 80% green and 95% blue. You’ll be hard-pressed to find a more colorful display.
Test Takeaway: One should not be swayed by the MO34WQC2’s peak output numbers. While it is possible to buy a brighter OLED, it’s difficult to buy a more colorful one. The gamut volume here more than makes up for any perceived brightness deficiency. And HDR grayscale accuracy is among the very best I’ve seen. Gigabyte delivers very high quality here.
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