HDR gaming
At this point it became exciting even for me. So far, I have not had a monitor in my test that was equipped with a full array local dimming backlight. The GP27U has 576 individual dimming zones in addition to the very good AU-Optronics IPS panel. With the hardware, it is actually possible to experience HDR. Unlike most “HDR monitors” with edge-lit dimming, which then also only have a rather ridiculous number of zones. I took a closer look at two of the three presets at this point.
HDR OSD User Mode (BT. 2020)
The good thing about the Cooler Master GP27U is that you can freely tweak the settings in the OSD even in HDR mode. White point control, dimming, etc. can be changed by the user. So, if you have at least a colorimeter, you can let off steam here. In the HDR user setting, the GP27U runs in the Rec. 2020 color space and achieves a best-case single frame contrast of 151,000:1 – which is a quite respectable value. Thus, it also fulfills the minimum requirements for a real HDR monitor.
Out of the box, the white point is beyond 6500K, which also explains the poor color accuracy. In addition, the EOTF tracking could be improved. Cooler Master will have to improve this again. This won’t really get much better with the next setting.
HDR OSD Game Mode (DCI-P3)
With this preset, the white point slides closer to the D65, but the panel still has the slight blue cast. What I noticed is that with the dimming settings in the OSD, you can not only affect the maximum brightness, but also the EOTF tracking. I should probably look at that issue again, or what do you guys think?
The GP27U here achieves almost 900 nits at an APL of 100 percent and around 1150 nits at 10 percent. My colleague Tim from Hardware Unboxed even measured almost 1500 nits – but that was before the big firmware update started. After the last FW update, Tim also only measured around 1200 nits. That is really damn bright. Thus, the monitor can shine especially in large bright HDR scenes, where most OLEDs have their weakness. The color accuracy is a bit better in game mode, which would be sufficient for gaming for me personally. The GP27U definitely delivers a real HDR experience.
To give you an idea of the difference between Edge-Lit vs. Full Array Local Dimming, here are a few pictures.
Cooler Master Tempest GP27U vs. ASUS ROG Swift PG279QM
Left GP27U (HDR user mode, Rec. 2020, D65, dimming medium) – right PG279QM (HDR mode, Rec. 2020, D65, dimming level 2)
The Cooler Master GP27U is by far better than the PG279QM when it comes to HDR. Hopefully now you also better understand my statement regarding edge-lit dimming: “Edge-lit dimming is part of the problem – not part of the solution!”
I left out the third and final HDR mode (Movie) for now. Cooler Master has tried to create a kind of MovieMaker mode (as known from TVs) with this mode. I still have a GP27U with me, because Cooler Master has left me. There I can test further software updates and keep you up to date. Maybe I’ll also write an article about HDR with FALD vs. OLED. We’ll see. For here and today I come to the end.
- 1 - Introduction, Features and Specs
- 2 - Workmanship and Details
- 3 - How we measure: Equipment and Methods
- 4 - Pixel Response Times
- 5 - Variable Overdrive?
- 6 - Display Latencies
- 7 - Color-Performance @ Default Settings
- 8 - Direct Comparison
- 9 - Color-Performance calibrated
- 10 - HDR-Performance
- 11 - Summary and Conclusion
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