ASUS ROG Strix XG309CM vs ASUS ROG Swift OLED PG27UCDM 27"
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
Open in calculator →
Category Ranking
Pixel Density (PPI)67in category
ASUS ROG Strix XG309CM94 PPI #65
ASUS ROG Swift OLED PG27UCDM 27"166 PPI #16
93 PPI224 PPI
HDR Peak Brightness67in category
ASUS ROG Strix XG309CM300 nits #65
ASUS ROG Swift OLED PG27UCDM 27"1000 nits #7
250 nits2000 nits
DCI-P3 Color Gamut
ASUS ROG Swift OLED PG27UCDM 27"99% #2
79%100%
Refresh Rate
ASUS ROG Strix XG309CM220 Hz
ASUS ROG Swift OLED PG27UCDM 27"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 ASUS ROG Strix XG309CM is not — you need to sit at least 93cm away for pixel-free viewing.
- Brightness: advantage ASUS ROG Strix XG309CM — The ASUS ROG Strix XG309CM is 20% brighter in SDR (300 vs 250 nits), a noticeable difference for outdoor readability. HDR peak: 300 vs 1000 nits.
Key Differences
| Specification | ASUS ROG Strix XG309CM | ASUS ROG Swift OLED PG27UCDM 27" |
|---|---|---|
| Screen Size | 29.5" | 26.5" |
| SDR Brightness | 300 nits | 250 nits |
| Resolution | 2560×1080 | 3840×2160 |
| Pixel Density (PPI) | 94 | 166 |
| Optimal Viewing Distance | 93cm | 53cm |
| Refresh Rate | 220 Hz | 240 Hz |
| Response Time | 1 ms GTG | 0.0 ms GTG |
| HDR Peak Brightness | 300 nits | 1000 nits |
| Contrast Ratio | 1:1,000 | 1:1,500,000 |
| USB-C Power Delivery | 15 W | 90 W |
| Color Gamut | sRGB 110% | sRGB 145% · DCI-P3 99% · Adobe RGB 94% |
| Year | 2022 | 2025 |
All specifications
| Specification | ASUS ROG Strix XG309CM 2022 | ASUS ROG Swift OLED PG27UCDM 27" 2025 |
|---|---|---|
| Screen Size | 29.5" (Better) | 26.5" |
| Resolution | 2560×1080 | 3840×2160 (Better) |
| Pixel Density (PPI) | 94 | 166 (Better) |
| Optimal Viewing Distance | 93cm | 53cm (Better) |
| Panel Type | IPS | QD-OLED |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 21:9 | 16:9 |
| Refresh Rate | 220 Hz | 240 Hz (Better) |
| Variable Refresh Rate (VRR) | FreeSync Premium | FreeSync Premium Pro |
| Response Time | 1 ms GTG | 0.0 ms GTG (Better) |
| HDR Certification | None | DisplayHDR True Black 400 |
| SDR Brightness | 300 nits (Better) | 250 nits |
| HDR Peak Brightness | 300 nits | 1000 nits (Better) |
| Contrast Ratio | 1:1,000 | 1:1,500,000 (Better) |
| Ports | 1x HDMI · 1x DP · USB-C · USB Hub | 2x HDMI · 1x DP · USB-C · USB Hub |
| USB-C Power Delivery | 15 W | 90 W (Better) |
| Color Gamut | sRGB 110% | sRGB 145% · DCI-P3 99% · Adobe RGB 94% (Better) |
| Year | 2022 | 2025 (Better) |
Frequently Asked Questions
Which has better PPI: ASUS ROG Strix XG309CM or ASUS ROG Swift OLED PG27UCDM 27"?
The ASUS ROG Swift OLED PG27UCDM 27" has 166 PPI compared to 94 PPI for the ASUS ROG Strix XG309CM.
Which has a closer optimal viewing distance?
The ASUS ROG Swift OLED PG27UCDM 27" requires 53cm vs 93cm for the ASUS ROG Strix XG309CM to reach retina quality.
Related Comparisons
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs ASUS ROG Strix XG309CM 2022 · 94 PPI · 29.5" · 220 Hz
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 AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs ASUS ROG Strix XG309CM 2022 · 94 PPI · 29.5" · 220 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
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: