ASUS ROG Swift OLED PG27UCDM 27" vs Samsung Odyssey G9 49"
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
Samsung Odyssey G9 49"109 PPI #55
93 PPI224 PPI
HDR Peak Brightness67in category
ASUS ROG Swift OLED PG27UCDM 27"1000 nits #7
Samsung Odyssey G9 49"1000 nits #7
250 nits2000 nits
DCI-P3 Color Gamut63in category
ASUS ROG Swift OLED PG27UCDM 27"99% #2
Samsung Odyssey G9 49"95% #48
79%100%
Refresh Rate
ASUS ROG Swift OLED PG27UCDM 27"240 Hz
Samsung Odyssey G9 49"240 Hz
StandardHighUltra
Summary
- Sharpness: advantage ASUS ROG Swift OLED PG27UCDM 27" — At 65cm, the ASUS ROG Swift OLED PG27UCDM 27" is retina (166 PPI) while the Samsung Odyssey G9 49" is not — you need to sit at least 80cm away for pixel-free viewing.
- Brightness: advantage Samsung Odyssey G9 49" — The Samsung Odyssey G9 49" is 68% brighter in SDR (420 vs 250 nits), a noticeable difference for outdoor readability. HDR peak: 1000 vs 1000 nits.
Key Differences
| Specification | ASUS ROG Swift OLED PG27UCDM 27" | Samsung Odyssey G9 49" |
|---|---|---|
| Resolution | 3840×2160 | 5120×1440 |
| Pixel Density (PPI) | 166 | 109 |
| Optimal Viewing Distance | 53cm | 80cm |
| Response Time | 0.0 ms GTG | 1 ms GTG |
| Contrast Ratio | 1:1,500,000 | 1:2,500 |
| Color Gamut | sRGB 145% · DCI-P3 99% · Adobe RGB 94% | sRGB 125% · DCI-P3 95% · Adobe RGB 92% |
| Year | 2025 | 2020 |
| Screen Size | 26.5" | 48.7" |
| SDR Brightness | 250 nits | 420 nits |
All specifications
| Specification | ASUS ROG Swift OLED PG27UCDM 27" 2025 | Samsung Odyssey G9 49" 2020 |
|---|---|---|
| Screen Size | 26.5" | 48.7" (Better) |
| Resolution | 3840×2160 (Better) | 5120×1440 |
| Pixel Density (PPI) | 166 (Better) | 109 |
| Optimal Viewing Distance | 53cm (Better) | 80cm |
| Panel Type | QD-OLED | VA |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 16:9 | 32:9 |
| Refresh Rate | 240 Hz | 240 Hz |
| Variable Refresh Rate (VRR) | FreeSync Premium Pro | FreeSync Premium Pro |
| Response Time | 0.0 ms GTG (Better) | 1 ms GTG |
| HDR Certification | DisplayHDR True Black 400 | DisplayHDR 1000 |
| SDR Brightness | 250 nits | 420 nits (Better) |
| HDR Peak Brightness | 1000 nits | 1000 nits |
| Contrast Ratio | 1:1,500,000 (Better) | 1:2,500 |
| Ports | 2x HDMI · 1x DP · USB-C · USB Hub | 1x HDMI · 2x DP · USB Hub |
| USB-C Power Delivery | 90 W | — |
| Color Gamut | sRGB 145% · DCI-P3 99% · Adobe RGB 94% (Better) | sRGB 125% · DCI-P3 95% · Adobe RGB 92% |
| Year | 2025 (Better) | 2020 |
Frequently Asked Questions
Which has better PPI: ASUS ROG Swift OLED PG27UCDM 27" or Samsung Odyssey G9 49"?
The ASUS ROG Swift OLED PG27UCDM 27" has 166 PPI compared to 109 PPI for the Samsung Odyssey G9 49".
Which has a closer optimal viewing distance?
The ASUS ROG Swift OLED PG27UCDM 27" requires 53cm vs 80cm for the Samsung Odyssey G9 49" 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 Samsung Odyssey G9 49" 2020 · 109 PPI · 48.7" · 240 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 Samsung Odyssey G9 49" 2020 · 109 PPI · 48.7" · 240 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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