Dell U3421WE 34" vs LG UltraGear 45GX950A 45"
Side-by-side comparison of viewing distance, PPI, and specifications
LG UltraGear 45GX950A 45"
44.5" · 5120×2160 · OLED
Optimal Viewing Distance 70cm
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Category Ranking
Pixel Density (PPI)67in category
Dell U3421WE 34"110 PPI #47
LG UltraGear 45GX950A 45"125 PPI #44
93 PPI224 PPI
HDR Peak Brightness67in category
Dell U3421WE 34"300 nits #65
LG UltraGear 45GX950A 45"1300 nits #3
250 nits2000 nits
DCI-P3 Color Gamut63in category
Dell U3421WE 34"95% #48
LG UltraGear 45GX950A 45"98% #31
79%100%
Refresh Rate
Dell U3421WE 34"60 Hz
LG UltraGear 45GX950A 45"165 Hz
StandardHighUltra
Summary
- Sharpness: advantage LG UltraGear 45GX950A 45" — Neither screen reaches retina quality at 65cm. The LG UltraGear 45GX950A 45" gets there at 70cm vs 80cm for the Dell U3421WE 34".
- Brightness: advantage LG UltraGear 45GX950A 45" — Similar SDR brightness (300 vs 275 nits), but the LG UltraGear 45GX950A 45" leads in HDR peak (1300 vs 300 nits).
Key Differences
| Specification | Dell U3421WE 34" | LG UltraGear 45GX950A 45" |
|---|---|---|
| SDR Brightness | 300 nits | 275 nits |
| Screen Size | 34" | 44.5" |
| Resolution | 3440×1440 | 5120×2160 |
| Pixel Density (PPI) | 110 | 125 |
| Optimal Viewing Distance | 80cm | 70cm |
| Refresh Rate | 60 Hz | 165 Hz |
| Response Time | 5 ms GTG | 0.0 ms GTG |
| HDR Peak Brightness | 300 nits | 1300 nits |
| Contrast Ratio | 1:1,000 | 1:1,500,000 |
| Color Gamut | sRGB 99% · DCI-P3 95% | sRGB 100% · DCI-P3 98% · Adobe RGB 94% |
| Year | 2021 | 2025 |
All specifications
| Specification | Dell U3421WE 34" 2021 | LG UltraGear 45GX950A 45" 2025 |
|---|---|---|
| Screen Size | 34" | 44.5" (Better) |
| Resolution | 3440×1440 | 5120×2160 (Better) |
| Pixel Density (PPI) | 110 | 125 (Better) |
| Optimal Viewing Distance | 80cm | 70cm (Better) |
| Panel Type | IPS | OLED |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 21:9 | 21:9 |
| Refresh Rate | 60 Hz | 165 Hz (Better) |
| Variable Refresh Rate (VRR) | None | FreeSync Premium Pro |
| Response Time | 5 ms GTG | 0.0 ms GTG (Better) |
| HDR Certification | None | DisplayHDR True Black 400 |
| SDR Brightness | 300 nits (Better) | 275 nits |
| HDR Peak Brightness | 300 nits | 1300 nits (Better) |
| Contrast Ratio | 1:1,000 | 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 | 90 W | 90 W |
| Color Gamut | sRGB 99% · DCI-P3 95% | sRGB 100% · DCI-P3 98% · Adobe RGB 94% (Better) |
| Year | 2021 | 2025 (Better) |
Frequently Asked Questions
Which has better PPI: Dell U3421WE 34" or LG UltraGear 45GX950A 45"?
The LG UltraGear 45GX950A 45" has 125 PPI compared to 110 PPI for the Dell U3421WE 34".
Which has a closer optimal viewing distance?
The LG UltraGear 45GX950A 45" requires 70cm vs 80cm for the Dell U3421WE 34" to reach retina quality.
Related Comparisons
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs Dell U3421WE 34" 2021 · 110 PPI · 34" · 60 Hz
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs LG UltraGear 45GX950A 45" 2025 · 125 PPI · 44.5" · 165 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs Dell U3421WE 34" 2021 · 110 PPI · 34" · 60 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs LG UltraGear 45GX950A 45" 2025 · 125 PPI · 44.5" · 165 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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