ASUS ROG Swift PG32UCDM3 vs Dell U3421WE 34"
Side-by-side comparison of viewing distance, PPI, and specifications
ASUS ROG Swift PG32UCDM3
31.5" · 3840×2160 · QD-OLED
Optimal Viewing Distance 62cm
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Category Ranking
Pixel Density (PPI)67in category
ASUS ROG Swift PG32UCDM3140 PPI #30
Dell U3421WE 34"110 PPI #47
93 PPI224 PPI
HDR Peak Brightness67in category
ASUS ROG Swift PG32UCDM31000 nits #7
Dell U3421WE 34"300 nits #65
250 nits2000 nits
DCI-P3 Color Gamut63in category
ASUS ROG Swift PG32UCDM399% #2
Dell U3421WE 34"95% #48
79%100%
Refresh Rate
ASUS ROG Swift PG32UCDM3240 Hz
Dell U3421WE 34"60 Hz
StandardHighUltra
Summary
- Sharpness: advantage ASUS ROG Swift PG32UCDM3 — At 65cm, the ASUS ROG Swift PG32UCDM3 is retina (140 PPI) while the Dell U3421WE 34" is not — you need to sit at least 80cm away for pixel-free viewing.
- Brightness: advantage ASUS ROG Swift PG32UCDM3 — Similar SDR brightness (300 vs 300 nits), but the ASUS ROG Swift PG32UCDM3 leads in HDR peak (1000 vs 300 nits).
Key Differences
| Specification | ASUS ROG Swift PG32UCDM3 | Dell U3421WE 34" |
|---|---|---|
| Resolution | 3840×2160 | 3440×1440 |
| Pixel Density (PPI) | 140 | 110 |
| Optimal Viewing Distance | 62cm | 80cm |
| Refresh Rate | 240 Hz | 60 Hz |
| Response Time | 0.0 ms GTG | 5 ms GTG |
| HDR Peak Brightness | 1000 nits | 300 nits |
| Contrast Ratio | 1:1,500,000 | 1:1,000 |
| Color Gamut | sRGB 100% · DCI-P3 99% | sRGB 99% · DCI-P3 95% |
| Year | 2025 | 2021 |
| Screen Size | 31.5" | 34" |
All specifications
| Specification | ASUS ROG Swift PG32UCDM3 2025 | Dell U3421WE 34" 2021 |
|---|---|---|
| Screen Size | 31.5" | 34" (Better) |
| Resolution | 3840×2160 (Better) | 3440×1440 |
| Pixel Density (PPI) | 140 (Better) | 110 |
| Optimal Viewing Distance | 62cm (Better) | 80cm |
| Panel Type | QD-OLED | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 16:9 | 21:9 |
| 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 500 | None |
| SDR Brightness | 300 nits | 300 nits |
| HDR Peak Brightness | 1000 nits (Better) | 300 nits |
| Contrast Ratio | 1:1,500,000 (Better) | 1:1,000 |
| Ports | 2x HDMI · 1x DP · USB-C · USB Hub | 2x HDMI · 1x DP · USB-C · USB Hub |
| USB-C Power Delivery | 90 W | 90 W |
| Color Gamut | sRGB 100% · DCI-P3 99% (Better) | sRGB 99% · DCI-P3 95% |
| Year | 2025 (Better) | 2021 |
Frequently Asked Questions
Which has better PPI: ASUS ROG Swift PG32UCDM3 or Dell U3421WE 34"?
The ASUS ROG Swift PG32UCDM3 has 140 PPI compared to 110 PPI for the Dell U3421WE 34".
Which has a closer optimal viewing distance?
The ASUS ROG Swift PG32UCDM3 requires 62cm vs 80cm for the Dell U3421WE 34" to reach retina quality.
Related Comparisons
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs ASUS ROG Swift PG32UCDM3 2025 · 140 PPI · 31.5" · 240 Hz
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs Dell U3421WE 34" 2021 · 110 PPI · 34" · 60 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs ASUS ROG Swift PG32UCDM3 2025 · 140 PPI · 31.5" · 240 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs Dell U3421WE 34" 2021 · 110 PPI · 34" · 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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