ASUS ROG Swift OLED PG27UCDM 27" vs Samsung ViewFinity S9 5K
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 ViewFinity S9 5K218 PPI #5
93 PPI224 PPI
HDR Peak Brightness67in category
ASUS ROG Swift OLED PG27UCDM 27"1000 nits #7
Samsung ViewFinity S9 5K600 nits #22
250 nits2000 nits
DCI-P3 Color Gamut63in category
ASUS ROG Swift OLED PG27UCDM 27"99% #2
Samsung ViewFinity S9 5K99% #2
79%100%
Refresh Rate
ASUS ROG Swift OLED PG27UCDM 27"240 Hz
Samsung ViewFinity S9 5K60 Hz
StandardHighUltra
Summary
- Sharpness: no visible difference — Both screens exceed the retina threshold at 65cm. The Samsung ViewFinity S9 5K has 24% higher pixel density (218 vs 166 PPI), but this only becomes visible below 40cm.
- Brightness: advantage Samsung ViewFinity S9 5K — The Samsung ViewFinity S9 5K is 140% brighter in SDR (600 vs 250 nits), a noticeable difference for outdoor readability. HDR peak: 600 vs 1000 nits.
Key Differences
| Specification | ASUS ROG Swift OLED PG27UCDM 27" | Samsung ViewFinity S9 5K |
|---|---|---|
| Refresh Rate | 240 Hz | 60 Hz |
| Response Time | 0.0 ms GTG | 5 ms GTG |
| HDR Peak Brightness | 1000 nits | 600 nits |
| Contrast Ratio | 1:1,500,000 | 1:1,000 |
| Color Gamut | sRGB 145% · DCI-P3 99% · Adobe RGB 94% | sRGB 100% · DCI-P3 99% · Adobe RGB 94% |
| Year | 2025 | 2023 |
| Screen Size | 26.5" | 27" |
| Resolution | 3840×2160 | 5120×2880 |
| Pixel Density (PPI) | 166 | 218 |
| Optimal Viewing Distance | 53cm | 40cm |
| SDR Brightness | 250 nits | 600 nits |
All specifications
| Specification | ASUS ROG Swift OLED PG27UCDM 27" 2025 | Samsung ViewFinity S9 5K 2023 |
|---|---|---|
| Screen Size | 26.5" | 27" (Better) |
| Resolution | 3840×2160 | 5120×2880 (Better) |
| Pixel Density (PPI) | 166 | 218 (Better) |
| Optimal Viewing Distance | 53cm | 40cm (Better) |
| Panel Type | QD-OLED | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 16:9 | 16:9 |
| Refresh Rate | 240 Hz (Better) | 60 Hz |
| Variable Refresh Rate (VRR) | FreeSync Premium Pro | None |
| Response Time | 0.0 ms GTG (Better) | 5 ms GTG |
| HDR Certification | DisplayHDR True Black 400 | None |
| SDR Brightness | 250 nits | 600 nits (Better) |
| HDR Peak Brightness | 1000 nits (Better) | 600 nits |
| Contrast Ratio | 1:1,500,000 (Better) | 1:1,000 |
| Ports | 2x HDMI · 1x DP · USB-C · USB Hub | 1x DP · USB-C · USB Hub |
| USB-C Power Delivery | 90 W | 90 W |
| Color Gamut | sRGB 145% · DCI-P3 99% · Adobe RGB 94% (Better) | sRGB 100% · DCI-P3 99% · Adobe RGB 94% |
| Year | 2025 (Better) | 2023 |
Frequently Asked Questions
Which has better PPI: ASUS ROG Swift OLED PG27UCDM 27" or Samsung ViewFinity S9 5K?
The Samsung ViewFinity S9 5K has 218 PPI compared to 166 PPI for the ASUS ROG Swift OLED PG27UCDM 27".
Which has a closer optimal viewing distance?
The Samsung ViewFinity S9 5K requires 40cm vs 53cm for the ASUS ROG Swift OLED PG27UCDM 27" 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 ViewFinity S9 5K 2023 · 218 PPI · 27" · 60 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 ViewFinity S9 5K 2023 · 218 PPI · 27" · 60 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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