Choose ASUS PG27UCDM for 4K OLED gaming at up to its rated 240Hz if you accept burn-in risk. Consider Cooler Master GP27U for 4K Mini-LED when static desktop work makes OLED care a poor fit. Check your games' 4K performance before choosing either refresh ceiling.
This comparison uses Cooler Master GP27U specifications. For ASUS, we cite official specs and RTINGS’ published review. The cited sources do not include a matched independent comparison of these two monitors. Brightness and refresh figures below are manufacturer claims, not our measurements.
Match the monitor to your games and GPU
Both screens are 3840 × 2160. ASUS lists 240Hz for the PG27UCDM; Cooler Master lists 160Hz for the GP27U. A screen’s maximum refresh rate does not promise that your games will reach it at the settings you want.
Start with your games, graphics card and preferred image settings. Check published benchmarks for that workload before paying for a higher refresh ceiling. If you would rather keep GPU demands lower, our 1440p guide is a sensible place to look.
Keep a working 1440p monitor if moving to 4K would force settings you do not want. Choose the higher resolution for a workload you can name, not the age of your current screen.
OLED and Mini-LED trade-offs
RTINGS’ PG27UCDM review supports its gaming performance and sharp text, while flagging OLED burn-in risk and raised blacks in bright rooms. Treat static interfaces and your room’s lighting as part of the buying decision, especially if the monitor also handles a full workday.
Cooler Master lists 576 dimming zones for the GP27U. Mini-LED zones control groups of pixels; OLED controls light at the pixel level. The GP27U zone count alone does not establish how visible blooming will be. Look for a published evaluation of that behavior before buying mainly for dark-room HDR.
Cooler Master lists 600-nit SDR brightness and a 1,200-nit HDR peak, with DisplayHDR 1000 certification. Those figures describe particular ratings and modes. Do not compare an HDR peak directly with full-screen SDR output and call it a brightness winner.
Ports, room lighting and warranty checks
ASUS lists DisplayPort 2.1, two HDMI 2.1 ports and USB-C with 90W power delivery. Cooler Master lists DisplayPort 1.4, two HDMI 2.1 ports and USB-C 90W. Check the exact resolution, refresh and charging mode supported by your computer, console and cable.
Power delivery can help a laptop desk, but 90W is not a promise that every gaming laptop will run at full load from the monitor. Compare your laptop’s requirements with the monitor documentation.
Read the current US warranty, seller and return terms for the exact model. Do not transfer an ASUS warranty promise to Cooler Master or assume a region’s coverage applies elsewhere. Our Black Friday watchlist explains the listing checks to make before a sale.
Choose the panel for the way you use the desk. Then check the seller and return terms. A discount cannot fix a monitor that does not fit your work, room or games.
