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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Advantages of ASUS ROG Swift OLED PG27UCDM 27"
| 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 |
Advantages of Samsung ViewFinity S9 5K
| Specification | ASUS ROG Swift OLED PG27UCDM 27" | Samsung ViewFinity S9 5K |
|---|---|---|
| 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 |
Identical
| Specification | ASUS ROG Swift OLED PG27UCDM 27" | Samsung ViewFinity S9 5K |
|---|---|---|
| Panel Type | QD-OLED | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 16:9 | 16:9 |
| Variable Refresh Rate (VRR) | FreeSync Premium Pro | None |
| HDR Certification | DisplayHDR True Black 400 | None |
| Ports | 2x HDMI · 1x DP · USB-C · USB Hub | 1x DP · USB-C · USB Hub |
| USB-C Power Delivery | 90 W | 90 W |
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.
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.
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).
Last updated:
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