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LG UltraFine 40U990A-W vs MSI MPG 341CQPX QD-OLED 34"

Side-by-side comparison of viewing distance, PPI, and specifications

LG UltraFine 40U990A-W

39.7" · 5120×2160 · IPS
Optimal Viewing Distance 62cm
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MSI MPG 341CQPX QD-OLED 34"

34.18" · 3440×1440 · QD-OLED
Optimal Viewing Distance 80cm
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Category Ranking

Pixel Density (PPI)67in category
LG UltraFine 40U990A-W140 PPI #30
MSI MPG 341CQPX QD-OLED 34"109 PPI #55
93 PPI224 PPI
HDR Peak Brightness67in category
LG UltraFine 40U990A-W600 nits #22
MSI MPG 341CQPX QD-OLED 34"1000 nits #7
250 nits2000 nits
DCI-P3 Color Gamut63in category
LG UltraFine 40U990A-W99% #2
MSI MPG 341CQPX QD-OLED 34"99% #2
79%100%
Refresh Rate
LG UltraFine 40U990A-W120 Hz
MSI MPG 341CQPX QD-OLED 34"240 Hz
StandardHighUltra

Summary

  • Sharpness: advantage LG UltraFine 40U990A-W — At 65cm, the LG UltraFine 40U990A-W is retina (140 PPI) while the MSI MPG 341CQPX QD-OLED 34" is not — you need to sit at least 80cm 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 MPG 341CQPX QD-OLED 34"
Screen Size 39.7" 34.18"
Resolution 5120×2160 3440×1440
Pixel Density (PPI) 140 109
Optimal Viewing Distance 62cm 80cm
SDR Brightness 450 nits 250 nits
Year 2025 2024
Refresh Rate 120 Hz 240 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
Color Gamut sRGB 100% · DCI-P3 99% sRGB 139% · DCI-P3 99% · Adobe RGB 98%
All specifications
Specification LG UltraFine 40U990A-W 2025 MSI MPG 341CQPX QD-OLED 34" 2024
Screen Size 39.7" (Better) 34.18"
Resolution 5120×2160 (Better) 3440×1440
Pixel Density (PPI) 140 (Better) 109
Optimal Viewing Distance 62cm (Better) 80cm
Panel Type IPS QD-OLED
Viewing Angle 178° 178°
Aspect Ratio 21:9 21:9
Refresh Rate 120 Hz 240 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 Hub
USB-C Power Delivery 98 W
Color Gamut sRGB 100% · DCI-P3 99% sRGB 139% · DCI-P3 99% · Adobe RGB 98% (Better)
Year 2025 (Better) 2024

Frequently Asked Questions

Which has better PPI: LG UltraFine 40U990A-W or MSI MPG 341CQPX QD-OLED 34"?
The LG UltraFine 40U990A-W has 140 PPI compared to 109 PPI for the MSI MPG 341CQPX QD-OLED 34".
Which has a closer optimal viewing distance?
The LG UltraFine 40U990A-W requires 62cm vs 80cm for the MSI MPG 341CQPX QD-OLED 34" 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).

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