The ROG Strix OLED XG27UCDMG is ASUS's 27-inch-class 4K 240 Hz QD-OLED gaming monitor. It offers 1000-nit peak HDR, DisplayHDR 400 True Black certification, two HDMI 2.1 ports, 90 W USB-C and KVM, with a three-year warranty that covers burn-in. It lacks DisplayPort 2.1, and the glossy surface raises blacks in a lit room.
XG27UCDMG · 26.5-inch 4K 240 Hz QD-OLED
| Specification | Value |
|---|---|
| Panel | 26.5-inch (27-inch class) QD-OLED, 16:9, anti-reflection surface |
| Resolution and refresh | 3840 × 2160, 240 Hz |
| Response time | 0.03 ms (GtG) |
| Brightness | 1000 cd/m² HDR peak |
| Contrast | 1,500,000:1 (typical) |
| Colour | 99% DCI-P3, 145% sRGB; ΔE < 2; 10-bit |
| HDR | HDR10; VESA DisplayHDR 400 True Black |
| Inputs | 1 × DisplayPort 1.4 (DSC); 2 × HDMI 2.1 (FRL); 1 × USB-C (DP Alt Mode, 90 W power) |
| USB hub and audio | 3 × USB 3.2 Gen 1 Type-A; headphone jack |
| Variable refresh | FreeSync Premium Pro, G-SYNC Compatible; VESA AdaptiveSync Display 240 Hz |
| Features | ASUS OLED Care, KVM switch, Extreme Low Motion Blur, Neo Proximity Sensor, flicker-free |
| Power consumption | < 80 W; < 0.5 W in power saving; < 0.3 W off; 100–240 V |
| Stand | Tilt +20°/−5°, swivel ±45°, pivot ±90°, 0–120 mm height; VESA 100 × 100; 1/4-inch tripod socket |
| Dimensions and weight | With stand 61.30 × 50.94 × 16.87 cm, 7.44 kg; without stand 61.03 × 36.92 × 6.65 cm, 5.0 kg |
| Warranty | 3 years (including panel burn-in) |
| In the box | DisplayPort, Ultra High Speed HDMI, USB 3.2 and USB-C cables; power cord; VESA mount kit; microfibre cloth |
ASUS offers the XG27UCDMG for 4K 240 Hz gaming and content creation, with OLED Care protection features, a proximity sensor and a three-year warranty that covers burn-in. ASUS ROG
According to TFTCentral the monitor uses Samsung Display's 4th-generation QD-OLED panel with 250 nits SDR brightness. It has DisplayPort 1.4 with DSC rather than DisplayPort 2.1, and supports HDR10 only, with no Dolby Vision. PiP/PbP and KVM are included.
TFTCentral: Asus ROG Strix XG27UCDMG launched with a 27" 4K 240Hz QD-OLED panelAccording to DisplayNinja, HDR brightness depends on white-window size: 250 nits at 100%, 450 at 10% and 1000 at 3%; with Uniform Brightness on, SDR is held at 250 nits. The glossy, unpolarised surface raises blacks and adds a purplish tint under direct light, and VRR brightness flicker shows in some games. Black frame insertion (BFI) works only at 120 Hz.
DisplayNinja: ASUS XG27UCDMG reviewOn ROG Forum, DevBlocky (July 2025) says MCM104 firmware would not install by either the USB or One Key method while MCM103 installed at once; an ASUS agent asked about connections and cables. The install finally worked with One Key after a few tries from a different, new desktop PC; no cause was given. leo6666 (August 2025) reports the same "FAIL 0x0000" error.
ROG Forum: XG27UCDMG firmware MCM104 install failureBrachaewi (July 2025) says a monitor that shipped with MCM101 firmware would not update, and shares a method that worked: putting the .bin file on a FAT32 USB 2.0 drive named "USB", connecting only DisplayPort, the USB 3.2 cable and power, draining power and then holding the joystick for 5 seconds at power-on, after which the update was detected. stekkoBiceps reports a similar problem.
ROG Forum: Can't update XG27UCDMG firmware