ASUS ROG Swift PG32UCDM3 vs LG UltraFine 40U990A-W
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
LG UltraFine 40U990A-W140 PPI #30
93 PPI224 PPI
HDR Peak Brightness67in category
ASUS ROG Swift PG32UCDM31000 nits #7
LG UltraFine 40U990A-W600 nits #22
250 nits2000 nits
DCI-P3 Color Gamut63in category
ASUS ROG Swift PG32UCDM399% #2
LG UltraFine 40U990A-W99% #2
79%100%
Refresh Rate
ASUS ROG Swift PG32UCDM3240 Hz
LG UltraFine 40U990A-W120 Hz
StandardHighUltra
Summary
- Sharpness: identical — Both screens are retina at 65cm with identical pixel density (140 PPI). No difference in sharpness.
- Brightness: advantage LG UltraFine 40U990A-W — The LG UltraFine 40U990A-W is 50% brighter in SDR (450 vs 300 nits), a noticeable difference for outdoor readability. HDR peak: 600 vs 1000 nits.
Key Differences
| Specification | ASUS ROG Swift PG32UCDM3 | LG UltraFine 40U990A-W |
|---|---|---|
| Refresh Rate | 240 Hz | 120 Hz |
| Response Time | 0.0 ms GTG | 5 ms GTG |
| HDR Peak Brightness | 1000 nits | 600 nits |
| Contrast Ratio | 1:1,500,000 | 1:2,000 |
| Screen Size | 31.5" | 39.7" |
| Resolution | 3840×2160 | 5120×2160 |
| SDR Brightness | 300 nits | 450 nits |
All specifications
| Specification | ASUS ROG Swift PG32UCDM3 2025 | LG UltraFine 40U990A-W 2025 |
|---|---|---|
| Screen Size | 31.5" | 39.7" (Better) |
| Resolution | 3840×2160 | 5120×2160 (Better) |
| Pixel Density (PPI) | 140 | 140 |
| Optimal Viewing Distance | 62cm | 62cm |
| Panel Type | QD-OLED | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 16:9 | 21:9 |
| Refresh Rate | 240 Hz (Better) | 120 Hz |
| Variable Refresh Rate (VRR) | FreeSync Premium Pro | FreeSync Premium |
| Response Time | 0.0 ms GTG (Better) | 5 ms GTG |
| HDR Certification | DisplayHDR True Black 500 | DisplayHDR 600 |
| SDR Brightness | 300 nits | 450 nits (Better) |
| HDR Peak Brightness | 1000 nits (Better) | 600 nits |
| Contrast Ratio | 1:1,500,000 (Better) | 1:2,000 |
| Ports | 2x HDMI · 1x DP · USB-C · USB Hub | 2x HDMI · 1x DP · USB-C · USB Hub |
| USB-C Power Delivery | 90 W | — |
| Color Gamut | sRGB 100% · DCI-P3 99% | sRGB 100% · DCI-P3 99% |
| Year | 2025 | 2025 |
Frequently Asked Questions
Which has better PPI: ASUS ROG Swift PG32UCDM3 or LG UltraFine 40U990A-W?
Both have 140 PPI.
Which has a closer optimal viewing distance?
Both require 62cm for retina quality.
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vs LG UltraFine 40U990A-W 2025 · 140 PPI · 39.7" · 120 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 LG UltraFine 40U990A-W 2025 · 140 PPI · 39.7" · 120 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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