Kuycon P40K vs LG UltraFine 40U990A-W
Side-by-side comparison of viewing distance, PPI, and specifications
Category Ranking
Pixel Density (PPI)67in category
Kuycon P40K139 PPI #41
LG UltraFine 40U990A-W140 PPI #30
93 PPI224 PPI
HDR Peak Brightness67in category
Kuycon P40K450 nits #48
LG UltraFine 40U990A-W600 nits #22
250 nits2000 nits
DCI-P3 Color Gamut63in category
Kuycon P40K96% #45
LG UltraFine 40U990A-W99% #2
79%100%
Refresh Rate
Kuycon P40K120 Hz
LG UltraFine 40U990A-W120 Hz
StandardHighUltra
Summary
- Sharpness: identical — Both screens are retina at 65cm. With nearly identical pixel density (139 vs 140 PPI), there is no visible difference in sharpness.
- Brightness: advantage LG UltraFine 40U990A-W — Similar SDR brightness (400 vs 450 nits), but the LG UltraFine 40U990A-W leads in HDR peak (600 vs 450 nits).
Key Differences
| Specification | Kuycon P40K | LG UltraFine 40U990A-W |
|---|---|---|
| Screen Size | 40" | 39.7" |
| Pixel Density (PPI) | 139 | 140 |
| Optimal Viewing Distance | 63cm | 62cm |
| Response Time | 8 ms GTG | 5 ms GTG |
| SDR Brightness | 400 nits | 450 nits |
| HDR Peak Brightness | 450 nits | 600 nits |
| Color Gamut | sRGB 99% · DCI-P3 96% | sRGB 100% · DCI-P3 99% |
All specifications
| Specification | Kuycon P40K 2025 | LG UltraFine 40U990A-W 2025 |
|---|---|---|
| Screen Size | 40" (Better) | 39.7" |
| Resolution | 5120×2160 | 5120×2160 |
| Pixel Density (PPI) | 139 | 140 (Better) |
| Optimal Viewing Distance | 63cm | 62cm (Better) |
| Panel Type | IPS | IPS |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 21:9 | 21:9 |
| Refresh Rate | 120 Hz | 120 Hz |
| Variable Refresh Rate (VRR) | G-SYNC Compatible | FreeSync Premium |
| Response Time | 8 ms GTG | 5 ms GTG (Better) |
| HDR Certification | None | DisplayHDR 600 |
| SDR Brightness | 400 nits | 450 nits (Better) |
| HDR Peak Brightness | 450 nits | 600 nits (Better) |
| Contrast Ratio | 1:2,000 | 1:2,000 |
| Ports | 2x HDMI · 1x DP · USB-C · USB Hub | 2x HDMI · 1x DP · USB-C · USB Hub |
| USB-C Power Delivery | 100 W | — |
| Color Gamut | sRGB 99% · DCI-P3 96% | sRGB 100% · DCI-P3 99% (Better) |
| Year | 2025 | 2025 |
Frequently Asked Questions
Which has better PPI: Kuycon P40K or LG UltraFine 40U990A-W?
The LG UltraFine 40U990A-W has 140 PPI compared to 139 PPI for the Kuycon P40K.
Which has a closer optimal viewing distance?
The LG UltraFine 40U990A-W requires 62cm vs 63cm for the Kuycon P40K to reach retina quality.
Related Comparisons
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs Kuycon P40K 2025 · 139 PPI · 40" · 120 Hz
Alienware AW2725DF 27" 2024 · 110 PPI · 26.7" · 360 Hz
vs LG UltraFine 40U990A-W 2025 · 140 PPI · 39.7" · 120 Hz
Alienware AW3225QF 32" 2024 · 139 PPI · 31.6" · 240 Hz
vs Kuycon P40K 2025 · 139 PPI · 40" · 120 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).
Last updated: