ASUS ROG Swift OLED PG27UCDM 27" vs Kuycon P40K
Side-by-side comparison of viewing distance, PPI, and specifications
ASUS ROG Swift OLED PG27UCDM 27"
26.5" · 3840×2160 · QD-OLED
Optimal Viewing Distance 53cm
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Category Ranking
Pixel Density (PPI)67in category
ASUS ROG Swift OLED PG27UCDM 27"166 PPI #16
Kuycon P40K139 PPI #41
93 PPI224 PPI
HDR Peak Brightness67in category
ASUS ROG Swift OLED PG27UCDM 27"1000 nits #7
Kuycon P40K450 nits #48
250 nits2000 nits
DCI-P3 Color Gamut63in category
ASUS ROG Swift OLED PG27UCDM 27"99% #2
Kuycon P40K96% #45
79%100%
Refresh Rate
ASUS ROG Swift OLED PG27UCDM 27"240 Hz
Kuycon P40K120 Hz
StandardHighUltra
Summary
- Sharpness: no visible difference — Both screens exceed the retina threshold at 65cm. The ASUS ROG Swift OLED PG27UCDM 27" has 20% higher pixel density (166 vs 139 PPI), but this only becomes visible below 53cm.
- Brightness: advantage Kuycon P40K — The Kuycon P40K is 60% brighter in SDR (400 vs 250 nits), a noticeable difference for outdoor readability. HDR peak: 450 vs 1000 nits.
Key Differences
| Specification | ASUS ROG Swift OLED PG27UCDM 27" | Kuycon P40K |
|---|---|---|
| Pixel Density (PPI) | 166 | 139 |
| Optimal Viewing Distance | 53cm | 63cm |
| Refresh Rate | 240 Hz | 120 Hz |
| Response Time | 0.0 ms GTG | 8 ms GTG |
| HDR Peak Brightness | 1000 nits | 450 nits |
| Contrast Ratio | 1:1,500,000 | 1:2,000 |
| Color Gamut | sRGB 145% · DCI-P3 99% · Adobe RGB 94% | sRGB 99% · DCI-P3 96% |
| Screen Size | 26.5" | 40" |
| Resolution | 3840×2160 | 5120×2160 |
| SDR Brightness | 250 nits | 400 nits |
| USB-C Power Delivery | 90 W | 100 W |
All specifications
| Specification | ASUS ROG Swift OLED PG27UCDM 27" 2025 | Kuycon P40K 2025 |
|---|---|---|
| Screen Size | 26.5" | 40" (Better) |
| Resolution | 3840×2160 | 5120×2160 (Better) |
| Pixel Density (PPI) | 166 (Better) | 139 |
| Optimal Viewing Distance | 53cm (Better) | 63cm |
| Panel Type | QD-OLED | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 16:9 | 21:9 |
| Refresh Rate | 240 Hz (Better) | 120 Hz |
| Variable Refresh Rate (VRR) | FreeSync Premium Pro | G-SYNC Compatible |
| Response Time | 0.0 ms GTG (Better) | 8 ms GTG |
| HDR Certification | DisplayHDR True Black 400 | None |
| SDR Brightness | 250 nits | 400 nits (Better) |
| HDR Peak Brightness | 1000 nits (Better) | 450 nits |
| Contrast Ratio | 1:1,500,000 (Better) | 1:2,000 |
| Ports | 2x HDMI · 1x DP · USB-C · USB Hub | 2x HDMI · 1x DP · USB-C · USB Hub |
| USB-C Power Delivery | 90 W | 100 W (Better) |
| Color Gamut | sRGB 145% · DCI-P3 99% · Adobe RGB 94% (Better) | sRGB 99% · DCI-P3 96% |
| Year | 2025 | 2025 |
Frequently Asked Questions
Which has better PPI: ASUS ROG Swift OLED PG27UCDM 27" or Kuycon P40K?
The ASUS ROG Swift OLED PG27UCDM 27" has 166 PPI compared to 139 PPI for the Kuycon P40K.
Which has a closer optimal viewing distance?
The ASUS ROG Swift OLED PG27UCDM 27" requires 53cm vs 63cm for the Kuycon P40K to reach retina quality.
Related Comparisons
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs ASUS ROG Swift OLED PG27UCDM 27" 2025 · 166 PPI · 26.5" · 240 Hz
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs Kuycon P40K 2025 · 139 PPI · 40" · 120 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs ASUS ROG Swift OLED PG27UCDM 27" 2025 · 166 PPI · 26.5" · 240 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs Kuycon P40K 2025 · 139 PPI · 40" · 120 Hz
Methodology & Sources
Formula: Retina distance (cm) = 3438 / PPI. Displayed values are rounded for readability.
Sources: Official manufacturer spec sheets and product pages. Specs are normalized before comparisons.
Comparison winners are calculated metric by metric (higher is better for most specs; lower is better for distance/response time).
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