LG UltraFine 40U990A-W vs MSI MAG 271QPX QD-OLED 27"
Side-by-side comparison of viewing distance, PPI, and specifications
MSI MAG 271QPX QD-OLED 27"
26.5" · 2560×1440 · QD-OLED
Optimal Viewing Distance 79cm
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Category Ranking
Pixel Density (PPI)67in category
LG UltraFine 40U990A-W140 PPI #30
MSI MAG 271QPX QD-OLED 27"111 PPI #45
93 PPI224 PPI
HDR Peak Brightness67in category
LG UltraFine 40U990A-W600 nits #22
MSI MAG 271QPX QD-OLED 27"1000 nits #7
250 nits2000 nits
DCI-P3 Color Gamut63in category
LG UltraFine 40U990A-W99% #2
MSI MAG 271QPX QD-OLED 27"99% #2
79%100%
Refresh Rate
LG UltraFine 40U990A-W120 Hz
MSI MAG 271QPX QD-OLED 27"360 Hz
StandardHighUltra
Summary
- Sharpness: advantage LG UltraFine 40U990A-W — At 65cm, the LG UltraFine 40U990A-W is retina (140 PPI) while the MSI MAG 271QPX QD-OLED 27" is not — you need to sit at least 79cm away for pixel-free viewing.
- Brightness: advantage LG UltraFine 40U990A-W — The LG UltraFine 40U990A-W is 80% brighter in SDR (450 vs 250 nits), a noticeable difference for outdoor readability. HDR peak: 600 vs 1000 nits.
Key Differences
| Specification | LG UltraFine 40U990A-W | MSI MAG 271QPX QD-OLED 27" |
|---|---|---|
| Screen Size | 39.7" | 26.5" |
| Resolution | 5120×2160 | 2560×1440 |
| Pixel Density (PPI) | 140 | 111 |
| Optimal Viewing Distance | 62cm | 79cm |
| SDR Brightness | 450 nits | 250 nits |
| Year | 2025 | 2024 |
| Refresh Rate | 120 Hz | 360 Hz |
| Response Time | 5 ms GTG | 0.0 ms GTG |
| HDR Peak Brightness | 600 nits | 1000 nits |
| Contrast Ratio | 1:2,000 | 1:1,500,000 |
All specifications
| Specification | LG UltraFine 40U990A-W 2025 | MSI MAG 271QPX QD-OLED 27" 2024 |
|---|---|---|
| Screen Size | 39.7" (Better) | 26.5" |
| Resolution | 5120×2160 (Better) | 2560×1440 |
| Pixel Density (PPI) | 140 (Better) | 111 |
| Optimal Viewing Distance | 62cm (Better) | 79cm |
| Panel Type | IPS | QD-OLED |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 21:9 | 16:9 |
| Refresh Rate | 120 Hz | 360 Hz (Better) |
| Variable Refresh Rate (VRR) | FreeSync Premium | FreeSync Premium Pro |
| Response Time | 5 ms GTG | 0.0 ms GTG (Better) |
| HDR Certification | DisplayHDR 600 | DisplayHDR True Black 400 |
| SDR Brightness | 450 nits (Better) | 250 nits |
| HDR Peak Brightness | 600 nits | 1000 nits (Better) |
| Contrast Ratio | 1:2,000 | 1:1,500,000 (Better) |
| Ports | 2x HDMI · 1x DP · USB-C · USB Hub | 2x HDMI · 1x DP · USB-C |
| USB-C Power Delivery | — | 15 W |
| Color Gamut | sRGB 100% · DCI-P3 99% | sRGB 100% · DCI-P3 99% |
| Year | 2025 (Better) | 2024 |
Frequently Asked Questions
Which has better PPI: LG UltraFine 40U990A-W or MSI MAG 271QPX QD-OLED 27"?
The LG UltraFine 40U990A-W has 140 PPI compared to 111 PPI for the MSI MAG 271QPX QD-OLED 27".
Which has a closer optimal viewing distance?
The LG UltraFine 40U990A-W requires 62cm vs 79cm for the MSI MAG 271QPX QD-OLED 27" to reach retina quality.
Related Comparisons
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs LG UltraFine 40U990A-W 2025 · 140 PPI · 39.7" · 120 Hz
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs MSI MAG 271QPX QD-OLED 27" 2024 · 111 PPI · 26.5" · 360 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs LG UltraFine 40U990A-W 2025 · 140 PPI · 39.7" · 120 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs MSI MAG 271QPX QD-OLED 27" 2024 · 111 PPI · 26.5" · 360 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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